JPH04210237A - Air cleaning material and production of the same - Google Patents

Abstract

PURPOSE:To obtain a deodorizing filter capable of efficiently removing CH3SH by bringing specified metallic element and alloy into contact with an aq. acidic soln., allowing the reaction product and unreacted metal to coexist with each other, and then sulfurating the materials. CONSTITUTION:A metallic element such as Fe, Mn and Cr and the alloy contg. the elements are brought into contact with an aq. soln. of an acid such as ascorbic acid and citric acid, and subjected to a reaction in the atmosphere to obtain a composition, in which the reaction product coexists with the unreacted metal, is obtained, and hydrogen sulfide is adsorbed by the composition. Consequently, a mixture of the metal, oxide, hydroxide, sulfide and complex is formed on the surface of the metal. The air contg. the malodorous gases such as NH3 and H2S is cleaned by the cleaning material thus obtained, and especially CH3SH is efficiently removed.

Description

[Detailed description of the invention]

[0001]

[Field of Industrial Application] The present invention relates to an air purifier for purifying contaminated air containing malodorous gases such as NH3 and H2S, and a method for producing the air purifier. For example, it can be used as a household deodorizer. [0002]

[Prior Art] Foul-smelling gases in the air are removed or the discomfort is reduced by adsorption methods using activated carbon, masking methods using other fragrances, and chemical methods that chemically react the odors. . [0003] The adsorption method using L oak and activated carbon has the problem that the deodorizing performance deteriorates in a short period of time, and the masking method using other fragrances has fundamental problems such as the fragrance may give a new unpleasant feeling. It's not a solution. [0004] Chemical methods involving biochemical reactions include, for example, a method in which ozone is used to oxidize and decompose malodorous gases, but excessive ozone is harmful to the human body and causes new harm. [0005] That is, since it is difficult to control the amount of chemical substances that react with malodorous gases, unnecessary chemical substances are generated, and it is difficult to find a fundamental solution. [0006] As a technology to solve these problems, the journal of the Japan Institute of Textile Science and Technology, "Textiles and Industry" Vol. 42. No, 12 (19
86), pp. 18-26, it is stated that a complex compound obtained by reacting a ferrous compound and ascorbic acid in an aqueous solution has deodorizing power against nitrogen compound-based odor gases. [0007] However, according to the findings of the present inventors, this complex compound has a problem in that it has a weak deodorizing power against sulfur compound-based odor gases. Furthermore, according to the findings of the present inventors, this complex compound has a problem in that its deodorizing ability deteriorates in a relatively short period of time. [00081 The present inventors previously invented a composition in which a reaction product produced by contacting metals such as iron and manganese with ascorbic acid, etc. coexisted with unreacted iron and manganese, and previously filed a patent application. The application was filed under No. 1-280776. [0009] This composition can be manufactured at low cost, has extremely little deterioration in air purifying ability, and solves the problems of the prior art. [00101

[Problems to be Solved by the Invention] The present inventors further extensively studied the composition of Japanese Patent Application No. 1-280776, and found that
Our goal is to provide a new material with air purifying power through a simpler process. In particular, a deodorizing material that improves the CH3SH removal rate and exhibits CH3SH removal performance over a long period of time is desired. [0011] Means for Solving the Problems The present invention provides Fe, Mn. On the surface of at least one metal selected from Cr, Ni, Zn, Al, Cu, Sn, Co, and alloys containing these metal elements, the metal, a metal oxide, a metal hydroxide, a metal sulfide, and a complex of a metal and an acid. [0012] An air freshener characterized in that the acid that produces the above body is ascorbic acid,
The air purifying product according to claim 1, characterized in that it is one or more acids selected from citric acid, tartaric acid, gluconic acid, tannic acid, and gallic acid, [0013] the metal is an aggregate of particulate metals. The air purifier according to claim 1, characterized in that [00
14] Fe, Mn, Cr, Ni, Zn, Al, Cu,
At least one metal selected from Sn and Co and alloys containing these metal elements is brought into contact with an aqueous acid solution and reacted in the atmosphere, producing a composition in which the reaction product coexists with the unreacted metal, A method for producing an air purifier characterized by adsorbing hydrogen sulfide thereon, [0015]
Aqueous solutions of the above acids include ascorbic acid, citric acid, tartaric acid,
Claim 4, characterized in that it is an aqueous solution of one or more acids selected from gluconic acid, tannic acid, and gallic acid.
This is a method for producing the air purifier described above. [0016] The present invention will be specifically explained below. According to the research conducted by the present inventors, the deodorizing performance of basic gases such as NH3 and (CH3)3N is very well adsorbed to metal complexes, which are the reaction products of polybasic acids and metals, but the adsorption of CH3SH gas Power is weak. [0017] One solution is to use a solid base as described by the present inventors in Japanese Patent Application No. 63-273195. However, subsequent research revealed that
It was discovered that when iron is used as a substance with strong adsorption power for acidic gases such as H2S, iron hydroxide and ferric oxide are produced when metallic iron is dissolved in an aqueous solution. [00181 Furthermore, in order to effectively generate iron hydroxide and maintain a stable effect over a long period of time, it may be necessary to form a state in which metallic iron, iron hydroxide, ferric oxide, and magnetite coexist. I figured it out. [00191 CH removal when H2S removal performance improves:] S
The reason why the H performance is also improved is thought to be that H in the -SH group has properties similar to H2S. Therefore, it can be inferred that it is effective to effectively generate iron hydroxide. [0020] Good H2S removal performance makes it possible to remove CH
The inventors' research has revealed that 3SR performance is not a sufficient condition for good performance. For example, the reaction product obtained by contacting iron with an aqueous L-ascorbic acid solution in air and heat-treating the coexistence of the complex salt and iron at 150°C for 24 hours has extremely good H2S removal performance, but has a slightly poor CH3SH removal performance. Inferior. [00211 As a result of investigating and researching various measures to improve the CH3SH removal performance, it was found that iron hydroxide, ferric oxide, and magnetite were formed on the iron surface that was exposed to a relatively dilute aqueous acid solution and left in the atmosphere. However, when hydrogen sulfide is adsorbed onto it, iron sulfide is produced, and the composition changes to a composition with extremely excellent CH3SH removal performance compared to the composition before hydrogen sulfide is adsorbed. I figured out what to do. [0022] The above phenomenon occurs when metals other than iron, Mn, Cr
, Ni, Zn, Al, Cu, Sn, Co, and alloys containing these metal elements. [0023] Although the mechanism of the improving effect of CH3SH removal performance by adsorbing hydrogen sulfide on the surface of the metal has not been fully elucidated, the hydrogen desulfide performance shows almost no deterioration even after repeated use. Based on the analysis results of the composition after adsorbing hydrogen sulfide, it is estimated that most of the adsorbed hydrogen sulfide has been decomposed, and metal sulfide and sulfur are generated in this composition, which greatly improves the adsorption performance of CH3SH. considered to be a thing. [0024]

[Example] Next, an example of the present invention will be described. [0025]

[Example 1] A urethane foam having a mesh roughness of 20 PPI was coated with fine pig iron powder of 10 μm or less, and fired in a non-oxidizing atmosphere at 1150° C. for 2 hours to produce a bar body. The size of one piece was about 90 mm x 80 mm x 10 mm, and the weight was about 40 g. [0026] The bar body is 0.02 in terms of gallic acid.
It was impregnated with a mol/1 aqueous tannic acid solution and left at room temperature for one week. It was placed in an evaluation device with a structure as shown in Figure 1, and hydrogen sulfide was adsorbed. [0027] The internal volume of the test device was 401, and the air flow rate of the circulation fan was about 4001 /min. First, first remove CH
The 3SH performance was evaluated, and then sulfide water was adsorbed. Hydrogen sulfide was injected with a syringe so that the starting concentration for one adsorption was 1000 ppm. [00281Almost the entire amount of hydrogen sulfide was absorbed into the barred hole body after 10 minutes, and this process was repeated three times. The porous body was left in the air for one day, and the CH3SH removal test was conducted again the next day. The evaluation results are shown in Table 1. [0029] The CH3SH removal performance was significantly improved, and it was confirmed that the improvement effect was maintained even in subsequent repeated CH3SH removal tests. [00301

[Example 2] Using the wire hole body produced in the same manner as in Example 1, 0.02 mol of L-ascorbic acid was added to 11
It was impregnated with an aqueous solution dissolved in water and left at room temperature for one week. After that, we investigated the performance of CH33H. It was placed in an evaluation device with a structure as shown in Figure 1, and hydrogen sulfide was adsorbed. [00311 The internal volume of the test device was 401 cm, and the air flow rate of the circulation fan was approximately 4001 cm/min. First, first remove CH
The 3SH performance was evaluated, followed by hydrogen sulfide adsorption. Hydrogen sulfide was injected with a syringe so that the starting concentration for one adsorption was 1000 ppn+. [00321 After 10 minutes, almost all of the hydrogen sulfide was absorbed into the barbed hole, and this process was repeated three times. The porous body was left in the air for one day, and the CH3SH removal test was conducted again the next day. The evaluation results are shown in Table 2. [0033] It was confirmed that the CH3SH removal performance was significantly improved and the improvement effect was maintained even in subsequent repeated CH3SH removal tests. [00341] [Example 3] A porous metal body was manufactured by depositing Cr, Nj, At, Cu, Mn, Co, and Zn on a urethane foam having a mesh roughness of 13 PPI by low-temperature spraying. The size of one piece is approximately 100mm x 90mm x 12mm
The weight was about 40g to 50g. [0035] These porous metal bodies were impregnated with an aqueous solution of 0.02 mol of L-ascorbic acid dissolved in 11 water, and left at room temperature for one week. After that, de-CH3
The SH performance was investigated. It was placed in an evaluation device with a structure as shown in Figure 1, and hydrogen sulfide was adsorbed. [0036] The internal volume of the test device was 401, and the air flow rate of the circulation fan was about 4001/min. First, first remove CH3
The SH performance was evaluated, and then hydrogen sulfide was adsorbed. Hydrogen sulfide was injected with a syringe so that the starting concentration for one adsorption was 1000 ppm. [00371Although there was some variation in the hydrogen sulfide concentration after 10 minutes, this was repeated three times. The porous body was left in the air for one day, and the CH33H removal test was conducted again the next day. The evaluation results are shown in Table 4. The deCH3SH performance was significantly improved. [0038] [Table 1] [0039]

[Table 2] [00401

[Table 3] [Table 4] (0042) [Effects of the Invention] According to the present invention, a deodorizing filter with high CH3SH removal performance can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the structure of a test device for evaluating deodorizing performance.

[Explanation of symbols]

1 Sealed container 2 Circulation fan 3. Deodorizing filter 4 Gas inlet 5 Gas sample sampling port 6 Direction of gas circulation

Claims (5)

[Claims] [Claim 1] Fe, Mn, Cr, Ni, Zn, Al, C
A coexistence of the metal, a metal oxide, a metal hydroxide, a metal sulfide, and a complex of a metal and an acid is formed on the surface of at least one metal selected from u, Sn, Co, and alloys containing these metal elements. An air purifier featuring: 2. The acid that forms the complex is ascorbic acid,
The air freshener according to claim 1, characterized in that it is one or more acids selected from citric acid, tartaric acid, gluconic acid, tannic acid, and gallic acid. 3. The air purifier according to claim 1, wherein the metal is an aggregate of granular metals. Claim 4: Fe, Mn, Cr, Ni, Zn, Al, C
At least one metal selected from u, Sn, Co, and alloys containing these metal elements is brought into contact with an aqueous acid solution and reacted in the atmosphere, producing a composition in which the reaction product coexists with unreacted metals. A method for producing an air purifier, characterized in that hydrogen sulfide is adsorbed onto the air purifier. 5. The air according to claim 4, wherein the aqueous acid solution is an aqueous solution of one or more acids selected from ascorbic acid, citric acid, tartaric acid, gluconic acid, tannic acid, and gallic acid. Method of manufacturing cleaning products.