CN107416827A - A kind of preparation method of useless tealeaves peanut based active carbon - Google Patents

Abstract

The invention provides a method for preparing waste tea-peanut shell-based activated carbon, which uses waste tea leaves and peanut shells as raw materials, pulverizes them and then impregnates them into potassium hydroxide, sodium hydroxide, phosphoric acid, sulfuric acid or zinc chloride. The solution of the activator is then dried in a constant temperature dryer, calcined in a muffle furnace, and the calcined product is ground to obtain waste tea-peanut shell-based activated carbon. The prepared waste tea-peanut shell-based activated carbon has high carbon content, large specific surface area, and high adsorption. The recycling of materials actively promotes the development of circular economy, and its preparation process is simple, easy to operate, and low in cost.

Description

A kind of preparation method of waste tea-peanut shell-based activated carbon

technical field

The invention belongs to the technical field of activated carbon, and relates to the preparation of composite raw material activated carbon, in particular to a preparation method of waste tea-peanut shell-based activated carbon.

Background technique

Activated carbon has become the most widely used environmentally friendly adsorbent due to its strong adsorption, catalytic performance and easy regeneration. There are a wide range of raw materials for the preparation of activated carbon, and most of the carbon-containing substances can be used to prepare activated carbon, such as plants, animals, waste materials, municipal garbage, etc. However, the traditional preparation of activated carbon from a single raw material has problems such as low carbon content and small specific surface area. Therefore, the use of composite raw materials to prepare activated carbon to improve adsorption performance has become the focus of research in recent years. Abandoned tea stems, tea powder and fruit shells are important agricultural and forestry wastes in my country. Their chemical components mainly include cellulose, hemicellulose, lignin, etc., which are no different from ordinary woody materials. They are good biomass for preparing activated carbon. raw material. At present, there have been corresponding studies on the preparation of activated carbon by using a single raw material in China, but there are few studies on the preparation of activated carbon by using composite raw materials. In order to find new composite raw materials and improve the performance of activated carbon, waste tea leaves and fruit shells were selected as research objects to prepare activated carbon with high performance. While expanding the source of raw materials for preparing activated carbon and providing a new and effective preparation method, this Applied in social production to realize the reuse of waste, it also plays a certain role in promoting the development of circular economy.

Contents of the invention

Aiming at the problem that there are many corresponding studies on the preparation of activated carbon by using a single raw material, but less research on the preparation of activated carbon by using composite raw materials, the present invention provides a method for preparing waste tea-peanut shell-based activated carbon by using waste tea leaves and peanut shells as raw materials .

A preparation method of waste tea leaves-peanut shell-based activated carbon, comprising the following steps:

(1) Peanut shells and waste tea leaves are dried and pulverized respectively, and peanut shell powder and waste tea powder passed through an 80-mesh sieve are mixed to obtain mixed raw material A;

(2) With potassium hydroxide, sodium hydroxide, phosphoric acid, sulfuric acid or zinc chloride as the activator, configure the activator solution with a mass concentration of 20% to 80%, and take the mass ratio of the activator solution to be 1:1～ The mixed raw material A of 1:6 is immersed in the activator solution, after soaking at room temperature for 1-10 hours, dry in a constant temperature dryer at 100°C for 30min, and then in a muffle furnace at 300-700°C Calcining in a medium vacuum for 1 to 6 hours, and finally grinding the calcined product in a mortar and passing through an 80-mesh sieve to obtain waste tea-peanut shell-based activated carbon.

Preferably, the mass ratio of the peanut shell powder to the waste tea powder is 1:7-7:1.

Preferably, the mass ratio of the peanut shell powder to the waste tea powder is 1:1.

Preferably, the activator solution is a zinc chloride solution.

Preferably, the mass concentration of the activator solution is 40%.

Preferably, the mass ratio of the mixed raw material A to the activator solution is 1:3.

Preferably, the soaking time is 2 hours.

Preferably, the calcination temperature is 500°C.

Preferably, the calcination time is 2 hours.

Beneficial effect:

The waste tea leaves-peanut shell-based activated carbon prepared by the present invention has high carbon content, large specific surface area, and high adsorption property. The raw materials of the waste tea leaves and peanut shells, which are solid wastes, are fully utilized, which expands the source of raw materials for preparing activated carbon and realizes The reuse of waste actively promotes the development of circular economy, and the preparation process is simple, the operation is convenient, and the cost is low.

detailed description

Below in conjunction with the examples, the specific implementation of the present invention will be further described in detail.

Example 1:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:7); 10.00 g was weighed. g mass concentration is 20% potassium hydroxide solution (the mass ratio of mixed raw material and activator solution is 1:1); the mixed raw material of peanut shell powder and waste tea leaf powder is placed in potassium hydroxide solution, soaked at room temperature After 1 hour, dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 300°C without air for 1 hour, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Example 2:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 7:1); 10.00 g was weighed. g mass concentration is 20% sodium hydroxide solution (the mass ratio of mixed raw material and activator solution is 1:1); the mixed raw material of peanut shell powder and waste tea powder is placed in sodium hydroxide solution, soaked at room temperature After 1 hour, dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 300°C without air for 1 hour, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Example 3:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through an 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:7); 60.00 g mass concentration is 80% phosphoric acid solution (the mass ratio of mixed raw material and activator solution is 1:6); The mixed raw material of peanut shell powder and waste tea leaf powder is placed in phosphoric acid solution, after soaking at room temperature for 10 hours, Dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 700°C for 6 hours without air, and finally grind the calcined product in a mortar and pass through a 80-mesh sieve to obtain waste tea leaves-peanut Shell-based activated carbon.

Example 4:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 7:1); 60.00 g mass concentration is 80% sulfuric acid solution (the mass ratio of mixed raw material and activator solution is 1:6); The mixed raw material of peanut shell powder and waste tea leaf powder is placed in sulfuric acid solution, after soaking at room temperature for 10 hours, Dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 700°C for 6 hours without air, and finally grind the calcined product in a mortar and pass through a 80-mesh sieve to obtain waste tea leaves-peanut Shell-based activated carbon.

Example 5:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:3); 50.00 g mass concentration is 50% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:5); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 6 hours, dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 400°C for 3 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Embodiment 6:

Peanut shells and waste tea leaves were dried and pulverized respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through an 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 40.00 g mass concentration is 20% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:4); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 6 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 70.48%.

Embodiment 7:

Peanut shells and waste tea leaves were dried and pulverized respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through an 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 40.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:4); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 6 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 96.35%.

Embodiment 8:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 30.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:3); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 6 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 97.94%.

Embodiment 9:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 30.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:3); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 6 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 400°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 98.79%.

Example 10:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 30.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:3); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 2 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 99.08%.

Example 11:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 1:1); 30.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:3); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 2 hours, dry in a constant temperature drier at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 3 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 98.11%.

Example 12:

Peanut shells and waste tea leaves were dried and crushed respectively, and a total of 10.00 g of peanut shell powder and waste tea powder passed through a 80-mesh sieve were weighed (the mass ratio of peanut shell powder and waste tea powder was 7:1); 30.00 g mass concentration is 40% zinc chloride solution (mass ratio of mixed raw material and activator solution is 1:3); the mixed raw material of peanut shell powder and waste tea powder is placed in zinc chloride solution, soaked at room temperature After 2 hours, dry in a constant temperature dryer at 100°C for 30 minutes, then calcinate in a muffle furnace at 500°C for 2 hours without air, and finally grind the calcined product in a mortar and pass through an 80-mesh sieve to obtain Waste tea leaves - peanut shell based activated carbon.

Take by weighing 0.100 g of the waste tea leaves-peanut shell-based activated carbon and add it to 50 ml of methylene blue solution (20 mg/l) for adsorption and removal. After shaking in an oscillator at a constant frequency for 20 min at room temperature, take it out and let it stand for 15 min. The absorbance of the supernatant was measured with a visible light spectrophotometer, and the calculated removal rate was 98.80%.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (9)

1. a preparation method of waste tea leaves-peanut shell-based activated carbon, is characterized in that, comprises the following steps: (1) Peanut shells and waste tea leaves are dried and pulverized respectively, and peanut shell powder and waste tea powder passed through an 80-mesh sieve are mixed to obtain mixed raw material A; (2) With potassium hydroxide, sodium hydroxide, phosphoric acid, sulfuric acid or zinc chloride as the activator, configure the activator solution with a mass concentration of 20% to 80%; the mass ratio to the activator solution is 1:1～ The mixed raw material A of 1:6 is immersed in the activator solution, after soaking at room temperature for 1-10 hours, dry in a constant temperature dryer at 100°C for 30min, and then in a muffle furnace at 300-700°C Calcining in a medium vacuum for 1 to 6 hours, and finally grinding the calcined product in a mortar and passing through an 80-mesh sieve to obtain waste tea-peanut shell-based activated carbon. 2. A method for preparing waste tea-peanut shell-based activated carbon according to claim 1, wherein the mass ratio of the peanut shell powder and waste tea powder is 1:7 to 7:1. 3. the preparation method of a kind of waste tealeaves-peanut shell-based activated carbon according to claim 2, is characterized in that, the mass ratio of described peanut shell powder and waste tealeaves powder is 1:1. 4. the preparation method of a kind of waste tea leaves-peanut shell base activated carbon according to claim 1, is characterized in that, described activator solution is zinc chloride solution. 5. A method for preparing waste tea leaves-peanut shell-based activated carbon according to claim 1 or 4, characterized in that the mass concentration of the activator solution is 40%. 6. A method for preparing waste tea leaves-peanut shell-based activated carbon according to claim 1 or 4, wherein the mass ratio of the mixed raw material A to the activator solution is 1:3. 7. The preparation method of a kind of waste tea leaves-peanut shell-based activated carbon according to claim 1, characterized in that, the soaking time is 2 hours. 8. A method for preparing waste tea leaves-peanut shell-based activated carbon according to claim 1, characterized in that the calcination temperature is 500°C. 9. A method for preparing waste tea leaves-peanut shell-based activated carbon according to claim 1 or 8, characterized in that the calcination time is 2 hours.