CN107029552B

CN107029552B - A kind of self-assembled coated cloth or paper for VOCs treatment and preparation method thereof

Info

Publication number: CN107029552B
Application number: CN201710330462.3A
Authority: CN
Inventors: 汪家道; 杜川
Original assignee: Tsinghua University; Tianjin Institute of Advanced Equipment of Tsinghua University
Current assignee: Tsinghua University; Tianjin Institute of Advanced Equipment of Tsinghua University
Priority date: 2017-05-11
Filing date: 2017-05-11
Publication date: 2020-06-02
Anticipated expiration: 2037-05-11
Also published as: CN107029552A

Abstract

The invention provides a self-assembled coated cloth or paper for the treatment of VOCs such as formaldehyde and a preparation method thereof, wherein the self-assembled coated cloth for the treatment of VOCs such as formaldehyde comprises a cloth base, an adsorption layer, a cured layer and a The composite nano-catalyst particle layer; the cloth base, the adsorption layer, the solidified layer and the composite nano-catalyst particle layer are stacked and arranged; the nanoparticles in the composite nano-catalyst particle layer exist on all fiber surfaces of the cloth base, and the overall coverage reaches 90% or more, and the nanoparticles in the composite nanocatalyst particle layer are partially embedded in the solidified layer. The self-assembled coating cloth for the treatment of formaldehyde and other VOCs described in the present invention has high coverage of composite nano-catalyst particles, strong binding force with cloth fibers, sufficient contact area with formaldehyde and other VOCs, and can completely remove formaldehyde and other VOCs Catalytic decomposition.

Description

Self-assembly coated cloth or paper for VOCs treatment and preparation method thereof

Technical Field

The invention belongs to the field of indoor air pollution purification, and particularly relates to self-assembled coated cloth or paper for treating VOCs (volatile organic compounds) such as formaldehyde and a preparation method thereof.

Background

With the gradual popularization of the fully decorated houses and automobiles, the environmental quality problems in rooms and automobiles are more and more concerned by various social circles. A large amount of finishing materials, which release toxic gases such as formaldehyde, benzene, toluene, xylene, TVOC (total volatile organic compounds), etc., to various degrees, are used in newly finished houses and vehicles. Among them, formaldehyde pollutes the most seriously, and has the greatest harm to human bodies. Formaldehyde is a toxic gas with a strong pungent smell, and formaldehyde with a certain concentration can cause damage to organs such as the nervous system, the lung, the liver and the like of a human body. Generally, the release period of formaldehyde is as long as 5 to 15 years, and if formaldehyde is not removed in time, the health of human body is necessarily affected.

At present, methods for treating VOCs (volatile organic compounds) such as formaldehyde mainly include ventilation methods, chemical methods, photocatalyst methods, physical adsorption methods and the like, but the methods have own disadvantages. If the ventilation method is not suitable under the condition that the door and the window are tightly closed; the chemical method is easy to cause secondary pollution; the reaction conditions of the photocatalyst method are harsh, and the photocatalyst method can only work under the irradiation of visible light and ultraviolet. Among the methods, the physical adsorption method has wide application due to the advantages of wide material source, low cost, simple operation, capability of removing various inorganic and organic pollutants and the like, and is the mainstream technology for treating VOCs such as formaldehyde and the like at present. The physical adsorption method usually adopts porous adsorbates with higher specific surface area, such as natural clay, molecular sieve, activated carbon, and the like, singly or in combination to adsorb volatile substances, such as formaldehyde, and the like, but most of the adsorbing materials are placed in bags, the amount and contact area of the adsorbing materials contacting with air are limited, and the adsorption efficiency is influenced. Therefore, the development of cloth or paper which can efficiently adsorb VOCs such as formaldehyde and can be catalyzed and decomposed in time and is beautiful and practical has positive significance for improving the living environment of people.

Disclosure of Invention

In view of the above, the invention aims to provide self-assembly coated cloth or paper for treating VOCs such as formaldehyde and the like, which overcomes the defects of the prior art, has high coverage rate of composite nano-catalyst particles, strong bonding force with cloth fibers and sufficient contact area with VOCs such as formaldehyde and the like, and can completely catalyze and decompose VOCs such as formaldehyde and the like.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a self-assembly coating cloth for treating VOCs such as formaldehyde comprises a cloth substrate, an adsorption layer, a curing layer and a composite nano catalyst particle layer; the cloth substrate, the adsorption layer, the curing layer and the composite nano catalyst particle layer are arranged in a stacked mode; the nanoparticles in the composite nano catalyst particle layer exist on all fiber surfaces of the cloth substrate, the overall coverage rate reaches more than 90%, and the nanoparticles in the composite nano catalyst particle layer are partially embedded in the cured layer; the nanoparticles of the composite nano catalyst particle layer are porous nanoparticles loaded with catalyst nanoparticles.

The second purpose of the invention is to provide self-assembly coating paper for treating VOCs such as formaldehyde, the composite nano-catalyst has high particle coverage rate, strong binding force with paper fiber, sufficient contact area with VOCs such as formaldehyde and the like, and can completely catalyze and decompose VOCs such as formaldehyde and the like.

A self-assembly coating paper for treating VOCs such as formaldehyde comprises a paper substrate, an adsorption layer, a curing layer and a composite nano catalyst particle layer; the paper substrate, the adsorption layer, the curing layer and the composite nano catalyst particle layer are arranged in a stacked mode; the nanoparticles in the composite nano catalyst particle layer exist on all fiber surfaces of the paper substrate, the overall coverage rate reaches more than 90%, and the nanoparticles in the composite nano catalyst particle layer are partially embedded in the cured layer; the nanoparticles of the composite nano catalyst particle layer are porous nanoparticles loaded with catalyst nanoparticles.

Preferably, the porous nanoparticles are one or more than two of chitin, nano silicon wafers, zeolite molecular sieves, diatomite, nano mineral crystals, vermiculite, palygorskite, montmorillonite, kaolin, attapulgite and sepiolite; the catalyst nano particles are one or more than two of nano titanium dioxide, nano zinc oxide and nano manganese dioxide. The porous nanoparticles loaded with nano titanium dioxide and nano zinc dioxide can be used for carrying out photocatalytic decomposition on VOCs gases such as formaldehyde and the like indoors; the porous nano-particles loaded with nano-manganese dioxide can catalyze, oxidize and decompose VOCs gases such as formaldehyde and the like indoors.

Preferably, the particle size of the porous nanoparticles is 50-1000 nm; the particle size of the catalyst nano-particles is 50-500 nm.

Preferably, the thickness of the cloth substrate or the paper substrate is 0.2-10 mm; the thickness of the adsorption layer is 50-500 nm; the cured layer thickness is less than 1 μm; the thickness of the composite nano catalyst particle layer is between 100 and 5000 nm; preferably, the thickness of the composite nano catalyst particle layer is between 100 and 500 nm.

Preferably, the cloth is one or non-woven fabrics of table cloth, wall cloth, curtains, sofa covers, cabinet covers, automobile seat covers and foot mat cloth; the paper is one of wallpaper, packing paper and stickers or non-woven paper. The selection of the cloth is not limited to the above list, nor is the selection of the paper limited to the above list.

Preferably, the cloth is made of one or more than two of cotton, hemp, polyester cotton, flax, terylene, polypropylene fiber, acrylic fiber, spandex, polyvinyl chloride fiber, vinylon and chinlon; the paper is made of one of resin, wood pulp and fabric. The material of the cloth is not limited to the above list, and the material of the paper is not limited to the above list.

The third purpose of the invention is to provide a method for preparing the self-assembly coating cloth for treating VOCs such as formaldehyde or the self-assembly coating paper for treating VOCs such as formaldehyde, so as to prepare the self-assembly coating cloth for treating VOCs such as formaldehyde or the self-assembly coating paper for treating VOCs such as formaldehyde, and the self-assembly coating cloth or the self-assembly coating paper is used for treating indoor air pollution, especially for treating VOCs such as formaldehyde.

a method for preparing the self-assembly coating cloth for treating VOCs (volatile organic compounds) such as formaldehyde or the self-assembly coating paper for treating VOCs such as formaldehyde comprises the following steps:

step (1): preparing a mixed solution a to enable the mixed solution a to contain 1-50 g/L of anionic polyelectrolyte or cationic polyelectrolyte and 0.01-2 mol/L of inorganic salt;

step (2): forming the mixed solution a on the surface of the cloth or paper and the surface of the internal fiber;

and (3): preparing a mixed solution b, wherein the mixed solution b comprises 5-20% of porous nanoparticles, 1-5% of catalyst nanoparticles and 2-10% of curing agent by mass, and fully stirring and dispersing;

and (4): drying the cloth or paper in the step (2), and then forming the mixed solution b on the surface of the cloth or paper and the surface of the internal fiber;

and (5): and (4) drying the cloth or paper in the step (4), then heating to 65-180 ℃, baking to solidify the curing agent, taking out and naturally cooling.

In the step (1), the anion polyelectrolyte or the cation polyelectrolyte and the inorganic salt form a self-assembly adsorbent, and an adsorption layer is further formed.

In the step (2), the curing agent in the mixed solution b forms a cured layer, wherein the low-melting-point nonionic surfactant is selected as the curing agent, so that the surface tension of the mixed solution b can be reduced, the effect of helping the nano material to disperse is achieved, and the curing effect is achieved.

In the step (3), the stirring or dispersing is not limited in time and form as long as the nanoparticles are fully contacted with the anionic and cationic surfactants and uniformly dispersed, but the dispersing mode is preferably ultrasonic dispersing, and the ultrasonic dispersing time is preferably 20-30 minutes.

Preferably, the drying temperature in the step (4) and the drying temperature in the step (5) are both 50-60 ℃, the drying time depends on the thickness of the cloth or paper and the physical properties of the cloth or paper, and the drying is carried out for volatilizing the solvent; in the step (5), the baking is performed for melting the curing agent, crosslinking with the porous nanoparticles to fix the porous nanoparticles on the surface of the substrate material, and the baking time is not limited, and is preferably 10 minutes or more based on the curing of the porous nanoparticles on the fibers.

Preferably, the anionic polyelectrolyte or the cationic polyelectrolyte is a substance capable of ionizing in a polar solution to charge a polymer chain, specifically, the anionic polyelectrolyte is one or more of polyacrylic acid, polymethacrylic acid, polystyrene sulfonic acid, polyvinyl sulfonic acid and polyvinyl phosphoric acid; the cationic polyelectrolyte is one or more than two of polyallylamine hydrochloride, polyethyleneimine, polyvinylamine, polydiallyldimethylammonium chloride, polyvinyl pyridine, polyphosphate and polysilicate; the inorganic salt is an inorganic salt which is easily soluble in water, and specifically, the inorganic salt is one or more than two of sodium chloride, potassium chloride, ammonium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate; the curing agent is a low-melting-point nonionic polymer, and specifically, the curing agent is one or more than two of polyvinylpyrrolidone, polyethylene glycol and polyethylene oxide; the anionic surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium laurate, sodium tetradecyl sulfate and sodium dodecyl sulfate; the cationic surfactant is one or more of cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride, N-hexadecyl pyridine chloride and dioctadecyl dimethyl ammonium bromide.

The selection of the anionic polyelectrolyte or the cationic polyelectrolyte is related to the charge property of the cloth or paper surface and the composite nano catalyst particle layer, and the basic principle is that the charge property of the anionic polyelectrolyte or the cationic polyelectrolyte is opposite to that of the cloth or paper surface and the composite nano catalyst particle layer, so that the self-assembled adsorption layer is formed on the surface of the cloth or paper fiber through electrostatic self-assembly. Specifically, firstly, the charge of the anionic polyelectrolyte or the cationic polyelectrolyte needs to be opposite to that of the surface of cloth or paper, so that the electrostatic self-assembly of the cloth or the paper and the polyelectrolyte is facilitated to form an adsorption layer; secondly, the charge property of the anionic polyelectrolyte or the cationic polyelectrolyte is opposite to that of the composite nano catalyst particle layer, so that the electrostatic self-assembly between the polyelectrolyte and the composite nano catalyst particle layer is facilitated.

Preferably, the mixed solution b further comprises 1-5% of an anionic surfactant or a cationic surfactant; the mixed solution a and the mixed solution b are formed on the cloth substrate or the paper substrate by spraying or dipping; preferably, the mixed solution a is formed on a cloth substrate or a paper substrate by dipping, and the time for dipping the cloth substrate or the paper substrate in the mixed solution a is 5-20 min; preferably, the mixed solution b is formed on the cloth substrate or the paper substrate by spray coating.

The selection of the anionic surfactant or the cationic surfactant is related to the charge of the composite nano catalyst particle layer and the self-assembled adsorption layer, the basic principle is that the charge of the composite nano catalyst particle layer is the same as that of the self-assembled adsorption layer, and is opposite to that of the self-assembled adsorption layer, further, if the composite nano catalyst particle layer is not charged, the selection of the anionic surfactant or the cationic surfactant is only related to the charge of the self-assembled adsorption layer, and further, if the composite nano catalyst particle layer is rich in charge, the anionic surfactant or the cationic surfactant can also be selected not to be used; purpose of adding anionic surfactant or cationic surfactant: firstly, the surface energy of the dispersion liquid is reduced, the dispersibility of the porous nano particles is improved, and secondly, the charge property of the porous nano particles is modified, so that the porous nano particles are easier to be coated on the surface of cloth or paper fibers through electrostatic self-assembly with a self-assembly adsorbent.

The curing agent and the anionic and cationic surfactants are used cooperatively, so that the dispersion of the nanoparticles can be promoted, the corresponding charge property is endowed to the nanoparticles, and the self-assembly of the nanoparticles on cloth or paper is facilitated.

Compared with the prior art, the self-assembled coated fabric for treating VOCs (volatile organic compounds) such as formaldehyde has the following advantages:

the self-assembly coating cloth for treating VOCs (volatile organic compounds) such as formaldehyde and the like has the advantages that firstly, the coverage rate of porous nanoparticles loaded with nano catalyst particles in the self-assembly cloth coating is high, the porous nanoparticles have larger contact area with VOCs such as formaldehyde and the like, the adsorption efficiency is high, and meanwhile, the catalyst nanoparticles loaded on the porous nanoparticles can be used for thoroughly catalytically decomposing absorbed formaldehyde and preventing the absorbed formaldehyde from being released back to form secondary pollution; and secondly, the binding force between the self-assembly cloth coating and the cloth fiber is strong, and the powder is not easy to fall off.

Compared with the prior art, the self-assembly coating paper for treating VOCs such as formaldehyde and the like provided by the invention has similar advantages to the self-assembly coating cloth for treating VOCs such as formaldehyde and the like, and is not repeated.

The invention provides a preparation method of self-assembly coating cloth for treating VOCs (volatile organic compounds) such as formaldehyde or self-assembly coating paper for treating VOCs such as formaldehyde, which has the advantages that firstly, under the action of a self-assembly adsorbent, porous nano particles loaded with nano catalyst particles are tightly arranged on the fiber surfaces of cloth or paper (all fiber surfaces contained in the cloth or paper), and the integral coverage rate can reach more than 90 percent; secondly, the curing agent is melted and then crosslinked with the porous nano-particles loaded with the nano-catalyst particles, so that the porous nano-particles loaded with the nano-catalyst particles are well fixed on the surface of the substrate material fiber, and the porous nano-particles loaded with the nano-catalyst particles are not easy to pulverize and fall off and are not blocked by the curing agent; thirdly, the preparation process is simple, special equipment is not needed, the material cost is low, the preparation is easy, the pure water formula is adopted, and the preparation method is non-toxic, harmless, safe and environment-friendly; and fourthly, the method has universality and can be widely applied to treatment of harmful gases such as formaldehyde, TVOC and the like in household rooms, offices, automobile interiors and various public places.

Drawings

FIG. 1 is a schematic structural diagram of a self-assembled coated furniture cloth for treatment of VOCs such as formaldehyde, according to embodiment 1 of the present invention;

fig. 2 is a scanning electron microscope image of the fiber surface of the self-assembled coated furniture cloth for treating VOCs such as formaldehyde in example 1 of the present invention.

Description of the main elements

Self-assembled coated fabric 100

Adsorption layer 10

Cured layer 20

Composite nanocatalyst particle layer 21

Substrate 30

Detailed Description

Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.

The present invention will be described in detail with reference to the following examples and accompanying drawings.

As shown in fig. 1, a self-assembly coated cloth 100 for treating VOCs such as formaldehyde comprises a cloth substrate 30, an adsorption layer 10, a cured layer 20 and a composite nano catalyst particle layer 21; the cloth substrate 30, the adsorption layer 10, the cured layer 20 and the composite nano catalyst particle layer 21 are arranged in a stacked manner; the nanoparticles in the composite nano-catalyst particle layer 21 exist on all the fiber surfaces of the cloth substrate 30, the overall coverage rate reaches 90% or more, and the nanoparticles in the composite nano-catalyst particle layer 21 are partially embedded in the cured layer 20; the nanoparticles of the composite nano catalyst particle layer are porous nanoparticles loaded with catalyst nanoparticles.

Example 1

A preparation method of self-assembly coating furniture cloth for treating VOCs such as formaldehyde comprises the following steps:

preparing a mixed solution a to contain 10 g/L of cationic polyelectrolyte (mixed solution of polyallylamine hydrochloride and polyvinylamine according to the volume ratio of 3: 1) and 0.1 mol/L of inorganic salt (sodium chloride); completely immersing 0.2 mm-thick polyester cotton furniture cloth into the mixed solution a, and depositing for 15 minutes; preparing a mixed solution b, wherein the mixed solution b comprises 5% of zeolite, 1% of nano titanium dioxide, 3% of sodium dodecyl benzene sulfonate and 5% of polyvinylpyrrolidone by mass percentage, and is fully stirred and dispersed, the particle size of zeolite nano particles is 50-200 nm, and the particle size of nano titanium dioxide particles is 10-20 nm; taking out the polyester cotton furniture cloth from the mixed solution a, and thoroughly drying the polyester cotton furniture cloth in hot air at 50 ℃; immersing the dried polyester cotton furniture cloth in the mixed solution b, standing for 15 minutes, and thoroughly drying by using hot air at 50 ℃; and (3) putting the dried polyester cotton furniture cloth into an oven, heating to 135 ℃, baking for 30 minutes, taking out and naturally cooling to obtain the self-assembled coated furniture cloth with the VOCs such as formaldehyde and the like. Through the observation of a scanning electron microscope, the zeolite nano particles loaded with nano titanium dioxide particles are densely distributed on the surfaces of the fibers in the polyester cotton furniture cloth, the coverage rate is over 90 percent and is far higher than that obtained by the traditional nano particle impregnation technology. The formaldehyde adsorption capacity of the self-assembly coating furniture cloth can reach 4.6 g/m through the test of a formaldehyde tester²·h。

Example 2

preparing a mixed solution a to contain 20g/L of anionic polyelectrolyte (polystyrene sulfonic acid) and 0.05 mol/L of inorganic salt (ammonium chloride); completely coating flax furniture cloth with the thickness of 0.3mmImmersing in the mixed liquid a, and depositing for 15 minutes; preparing a mixed solution b, wherein the mixed solution b comprises 10% of diatomite, 1% of nano zinc oxide, 2% of sodium dodecyl sulfate and 4% of a curing agent (the mass ratio of polyvinylpyrrolidone to polyethylene oxide is 1: 1), and the mixed solution b is fully stirred and dispersed, wherein the particle size of diatomite nanoparticles is 100-500 nm, and the particle size of nano zinc oxide particles is 20 nm; taking out the flax furniture cloth from the mixed solution a, and drying the flax furniture cloth in hot air at 50 ℃; immersing the dried flax furniture cloth in the mixed solution b, standing for 15 minutes, and thoroughly drying by using hot air at 50 ℃; and (3) putting the dried flax furniture cloth into an oven, heating to 130 ℃, baking for 30 minutes, taking out and naturally cooling to obtain the self-assembly coating furniture cloth for treating VOCs (volatile organic compounds) such as formaldehyde. Through observation of a scanning electron microscope, the diatomite nanoparticles loaded with the nano zinc oxide are densely distributed on the fiber surface of the linen furniture cloth, and the coverage rate is over 90 percent and is far higher than that obtained by the traditional nanoparticle dipping technology. The formaldehyde adsorption capacity of the self-assembly coating furniture cloth can reach 2.6g/m through the test of a formaldehyde tester²H, the adsorption efficiency is 10 times that of the activated carbon particles and diatom ooze coating on the market.

Example 3

A preparation method of self-assembly coating wallpaper for treating VOCs (volatile organic compounds) such as formaldehyde comprises the following steps:

preparing a mixed solution a to contain 15 g/L of cationic polyelectrolyte (polyvinyl amine) and 0.15 mol/L of inorganic salt (potassium chloride); completely immersing the polyester non-woven fabric wallpaper in the mixed solution a, and depositing for 15 minutes; preparing a mixed solution b, wherein the mixed solution b comprises 15% of attapulgite, 2% of catalyst nanoparticles (the mass ratio of nano titanium dioxide to nano manganese dioxide is 9: 1), 3% of sodium laurate and 8% of polyethylene glycol, and the catalyst nanoparticles are fully stirred and dispersed, wherein the particle size of the attapulgite particles is 200-500 nm, and the particle size of the catalyst nanoparticles is 10-20 nm; taking the terylene non-woven paper out of the mixed solution a, and drying the terylene non-woven paper in hot air at 50 ℃; immersing the dried polyester non-woven fabric wallpaper in the mixed solution b, standing for 15 minutes, and then thoroughly drying by using hot air at 50 ℃; and (3) putting the dried polyester non-woven fabric wallpaper into an oven, heating to 70 ℃, baking for 30 minutes, taking out and naturally cooling to obtain the self-assembly coating wallpaper for treating VOCs (volatile organic compounds) such as formaldehyde. Observed by a scanning electron microscope, the surface of the fiber in the polyester non-woven wallpaper is densely covered with attapulgite particles loaded with nano titanium dioxide and nano manganese dioxide, and the coverage rate is over 90 percent and is far higher than that obtained by the traditional nano particle impregnation technology. Tests show that the adsorption rate of the formaldehyde is over 85 percent, and the adsorption rates of the benzene and the toluene are over 70 percent.

Example 4

preparing a mixed solution a to contain 10 g/L of anionic polyelectrolyte (polyacrylic acid) and 0.08mol/L of inorganic salt (the mass ratio of sodium chloride to sodium sulfate is 1: 1); completely immersing the resin velvet wallpaper in the mixed solution a, and depositing for 15 minutes; preparing a mixed solution b, wherein the mixed solution b comprises 10% by mass of zeolite and sepiolite (the mass ratio of the zeolite to the sepiolite is 1: 1), 1% by mass of nano titanium dioxide, 3% by mass of hexadecyl trimethyl ammonium bromide and 10% by mass of a curing agent (the mass ratio of polyethylene glycol to polyethylene oxide is 1: 1), and the mixed solution b is fully stirred and dispersed, wherein the particle diameters of the zeolite and the sepiolite are both 50-500 nm, and the particle diameter of the nano titanium dioxide is 10-20 nm; taking out the resin velvet wallpaper from the mixed solution a, and drying in hot air at 50 ℃; immersing the dried resin velvet wallpaper in the mixed solution b, standing for 15 minutes, and then thoroughly drying by using hot air at 50 ℃; and (3) putting the dried resin velvet wallpaper into an oven, heating to 80 ℃, baking for 30 minutes, taking out and naturally cooling to obtain the self-assembly coating resin velvet wallpaper with VOCs (volatile organic compounds) such as formaldehyde and the like. Observed by a scanning electron microscope, the fiber surface of the resin velvet wallpaper is densely covered with zeolite and sepiolite nano particles loaded with nano titanium dioxide, the coverage rate is over 90 percent and is far higher than that obtained by the traditional nano particle impregnation technology. Tests show that the adsorption rate of the formaldehyde reaches more than 85 percent, and the adsorption rates of the benzene and the toluene are both more than 75 percent.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a self-assembling coated fabric for VOCs administers which characterized in that: comprises a cloth substrate, an adsorption layer, a curing layer and a composite nano catalyst particle layer; the cloth substrate, the adsorption layer, the curing layer and the composite nano catalyst particle layer are arranged in a stacked mode; the nanoparticles in the composite nano catalyst particle layer exist on all fiber surfaces of the cloth substrate, the overall coverage rate reaches more than 90%, and the nanoparticles in the composite nano catalyst particle layer are partially embedded in the cured layer; the nanoparticles of the composite nano catalyst particle layer are porous nanoparticles loaded with catalyst nanoparticles; the curing agent in the curing layer is one or more than two of polyvinylpyrrolidone, polyethylene glycol and polyethylene oxide;

the preparation method of the self-assembly coating cloth for VOCs treatment comprises the following steps:

step (2): forming the mixed solution a on the surface of the fabric substrate and the surface of the internal fiber;

and (4): drying the cloth substrate in the step (2), and then forming the mixed solution b on the surface of the cloth substrate and the surface of the internal fiber;

and (5): drying the cloth substrate in the step (4), then heating to 130-180 ℃, baking to solidify the curing agent, taking out and naturally cooling;

the mixed solution b further comprises an anionic surfactant or a cationic surfactant, and the anionic surfactant or the cationic surfactant has the same charge property as the composite nano catalyst particle layer and is opposite to the charge property of the adsorption layer.

2. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the porous nano-particles are one or more than two of chitin, nano silicon wafers, zeolite molecular sieves, diatomite, nano mineral crystals, vermiculite, palygorskite, montmorillonite, kaolin, attapulgite and sepiolite; the catalyst nano particles are one or more than two of nano titanium dioxide, nano zinc oxide and nano manganese dioxide.

3. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the particle size of the porous nano-particles is 50-1000 nm; the particle size of the catalyst nano-particles is 50-500 nm.

4. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the thickness of the cloth substrate is 0.2-10 mm; the thickness of the adsorption layer is 50-500 nm; the cured layer thickness is less than 1 μm; the thickness of the composite nano catalyst particle layer is between 100 and 5000 nm.

5. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the cloth substrate is one of table cloth, wall cloth, a curtain, a sofa cover, a cabinet cover, an automobile seat cover and foot pad cloth.

6. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the cloth substrate is made of one or more than two of cotton, hemp, polyester cotton, flax, terylene, polypropylene fiber, acrylic fiber, spandex, polyvinyl chloride fiber, vinylon and polyamide fiber.

7. The self-assembled coated fabric for VOCs remediation of claim 1, wherein: the thickness of the composite nano catalyst particle layer is between 100 and 500 nm.

8. A self-assembly coated paper for VOCs treatment is characterized in that: comprises a paper substrate, an adsorption layer, a curing layer and a composite nano catalyst particle layer; the paper substrate, the adsorption layer, the curing layer and the composite nano catalyst particle layer are arranged in a stacked mode; the nanoparticles in the composite nano-catalyst particle layer are present on all fiber surfaces of the paper substrate, the overall coverage rate reaches more than 90%, and the nanoparticles in the composite nano-catalyst particle layer are partially embedded in the cured layer; the nanoparticles of the composite nano catalyst particle layer are porous nanoparticles loaded with catalyst nanoparticles; the curing agent in the curing layer is one or more than two of polyvinylpyrrolidone, polyethylene glycol and polyethylene oxide;

the preparation method of the self-assembly coating paper for VOCs treatment comprises the following steps:

step (2): forming the mixed solution a on the surface of the paper substrate and the surface of the internal fiber;

and (4): drying the paper base in the step (2), and then forming the mixed solution b on the bottom surface of the paper base and the surface of the internal fiber;

and (5): drying the paper substrate in the step (4), then heating to 130-180 ℃, baking to solidify the curing agent, taking out and naturally cooling;

9. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the porous nano-particles are one or more than two of chitin, nano silicon wafers, zeolite molecular sieves, diatomite, nano mineral crystals, vermiculite, palygorskite, montmorillonite, kaolin, attapulgite and sepiolite; the catalyst nano particles are one or more than two of nano titanium dioxide, nano zinc oxide and nano manganese dioxide.

10. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the particle size of the porous nano-particles is 50-1000 nm; the particle size of the catalyst nano-particles is 50-500 nm.

11. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the thickness of the paper substrate is 0.2-10 mm; the thickness of the adsorption layer is 50-500 nm; the cured layer thickness is less than 1 μm; the thickness of the composite nano catalyst particle layer is between 100 and 5000 nm.

12. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the paper substrate is one of wallpaper, packing paper and stickers.

13. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the paper substrate is made of one of resin, wood pulp and fabric.

14. The self-assembled coated paper for the remediation of VOCs of claim 8, wherein: the thickness of the composite nano catalyst particle layer is between 100 and 500 nm.

15. The method of any one of claims 1 to 7 for preparing a self-assembled coated fabric for the remediation of VOCs, wherein: the method comprises the following steps:

and (5): and (4) drying the cloth substrate in the step (4), then heating to 130-180 ℃, baking to solidify the curing agent, and taking out for natural cooling.

16. The method of claim 15, wherein the method comprises the steps of: the anionic polyelectrolyte is one or more than two of polyacrylic acid, polymethacrylic acid, polystyrene sulfonic acid, polyvinyl sulfonic acid and polyvinyl phosphoric acid; the cationic polyelectrolyte is one or more than two of polyallylamine hydrochloride, polyethyleneimine, polyvinylamine, polydiallyldimethylammonium chloride, polyvinyl pyridine, polyphosphate and polysilicate; the inorganic salt is one or more than two of sodium chloride, potassium chloride, ammonium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate; the curing agent is one or more than two of polyvinylpyrrolidone, polyethylene glycol and polyethylene oxide.

17. The method of claim 15, wherein the method comprises the steps of: the mixed solution b also comprises 1-5% of an anionic surfactant or a cationic surfactant; the anionic surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium laurate, sodium tetradecyl sulfate and sodium dodecyl sulfate; the cationic surfactant is one or more than two of cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride, N-hexadecyl pyridine chloride and dioctadecyl dimethyl ammonium bromide; the mixed liquid a and the mixed liquid b are formed on the cloth substrate by spraying or dipping.

18. The method of claim 15, wherein the method comprises the steps of: the mixed liquid a is formed on the cloth substrate in a dipping mode, and the time for dipping the cloth substrate in the mixed liquid a is 5-20 min.

19. The method of claim 15, wherein the method comprises the steps of: the mixed solution b is formed on the cloth substrate by spraying.

20. A method of preparing a self-assembled coated paper for the remediation of VOCs as claimed in any one of claims 8 to 14, wherein: the method comprises the following steps:

and (5): and (4) drying the paper substrate in the step (4), then heating to 130-180 ℃, baking to solidify the curing agent, and taking out for natural cooling.

21. The method of preparing a self-assembled coated paper for VOCs remediation of claim 20, wherein: the anionic polyelectrolyte is one or more than two of polyacrylic acid, polymethacrylic acid, polystyrene sulfonic acid, polyvinyl sulfonic acid and polyvinyl phosphoric acid; the cationic polyelectrolyte is one or more than two of polyallylamine hydrochloride, polyethyleneimine, polyvinylamine, polydiallyldimethylammonium chloride, polyvinyl pyridine, polyphosphate and polysilicate; the inorganic salt is one or more than two of sodium chloride, potassium chloride, ammonium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate; the curing agent is one or more than two of polyvinylpyrrolidone, polyethylene glycol and polyethylene oxide.

22. The method of preparing a self-assembled coated paper for VOCs remediation of claim 20, wherein: the mixed solution b also comprises 1-5% of an anionic surfactant or a cationic surfactant; the anionic surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium laurate, sodium tetradecyl sulfate and sodium dodecyl sulfate; the cationic surfactant is one or more than two of cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride, N-hexadecyl pyridine chloride and dioctadecyl dimethyl ammonium bromide; the mixed liquid a and the mixed liquid b are formed on the paper substrate by spraying or dipping.

23. The method of preparing a self-assembled coated paper for VOCs remediation of claim 20, wherein: the mixed liquid a is formed on the paper substrate in a dipping mode, and the time for dipping the paper substrate in the mixed liquid a is 5-20 min.

24. The method of preparing a self-assembled coated paper for VOCs remediation of claim 20, wherein: the mixed liquid b is formed on the paper substrate by spraying.