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Visible light catalyst, its preparation method and method for degrading pesticide pollutants

A technology for degrading pesticides and pollutants, applied in water pollutants, chemical instruments and methods, catalysts for physical/chemical processes, etc. The oxidation reaction process with pollutants, the effect of improving the degradation efficiency and high stability

Active Publication Date: 2021-03-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Doping noble metals such as Au@ZnS-AgAuS and Au / ZnWO during the preparation of composite catalysts 4 -ZnO, which increases the preparation cost while improving the activity; sometimes due to improper preparation process, the crystallinity of the catalyst is low, which has a negative impact on the photocatalytic activity; nano-catalysts are easy to agglomerate in water treatment, and the surface of the catalyst cannot be fully utilized. Active sites, which limit the improvement of catalytic activity, become the main obstacle for practical water treatment applications

Method used

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  • Visible light catalyst, its preparation method and method for degrading pesticide pollutants
  • Visible light catalyst, its preparation method and method for degrading pesticide pollutants
  • Visible light catalyst, its preparation method and method for degrading pesticide pollutants

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preparation example Construction

[0024] The invention discloses a preparation method of a visible light catalyst, comprising:

[0025] Adding polyvinylpyrrolidone solution and KMnO to the rGO dispersion 4 solution to obtain the first mixed solution;

[0026] maintaining the first mixed solution under the condition of a water bath at the first temperature for the first time to obtain a second mixed solution;

[0027] The second mixed solution is maintained at the second temperature for a second time and then lowered to obtain a γ-MnOOH-rGO composite material, which is the visible light catalyst.

[0028] In some embodiments of the present invention, the concentration of the rGO dispersion is 0.1-0.3 mol / L, such as 0.12 mol / L, 0.15 mol / L, 0.18 mol / L, 0.20 mol / L, 0.22 mol / L , 0.25mol / L, 0.28mol / L;

[0029] In some embodiments of the present invention, the concentration of the polyvinylpyrrolidone solution is 30-60g / L, such as 35g / L, 40g / L, 45g / L, 50g / L, 55g / L;

[0030] In some embodiments of the present inve...

Embodiment 1

[0061] The preparation method of a visible light catalyst and the water treatment application assisted by ultrasound in this embodiment are carried out through the following steps:

[0062] 1. Preparation of rGO nanosheets: GO was treated in deionized water by ultrasonic treatment at 300W for 10min. At room temperature, ascorbic acid was added to the GO dispersion to obtain 80 mL of a mixed solution, wherein the concentration of GO in the mixed solution was 0.1 mol / L, and the concentration of ascorbic acid was 1 mmol / L; the pH of the solution was adjusted to 9 with 20% ammonia water. The mixture was maintained in a water bath at 90°C for 1 h, the suspension was filtered at 10 kPa, the collected suspended solids were washed 5 times with deionized water, and then dried in a vacuum oven at 60°C for 0.5 h.

[0063] 2. Preparation of γ-MnOOH-rGO composite photocatalyst: 80 mL of 0.1 mol / L rGO dispersion was prepared in deionized water, and 300 W ultrasonic treatment was performed f...

Embodiment 2

[0070] The preparation method of a visible light catalyst and the water treatment application assisted by ultrasound in this embodiment are carried out through the following steps:

[0071] 1. Preparation of rGO nanosheets: GO was treated in deionized water by ultrasonic treatment at 300W for 30min. At room temperature, ascorbic acid was added to the GO dispersion to obtain 80 mL of a mixed solution, wherein the concentration of GO in the mixed solution was 0.3 mol / L, and the concentration of ascorbic acid was 3 mmol / L; the pH of the solution was adjusted to 10 with 40% ammonia water. The mixture was maintained in a water bath at 90°C for 3 hours, the suspension was filtered at 50kPa, the collected suspended solids were washed 10 times with deionized water, and then dried in a vacuum oven at 80°C for 2 hours.

[0072] 2. Preparation of γ-MnOOH-rGO composite photocatalyst: 80 mL of 0.3 mol / L rGO dispersion was prepared in deionized water, and subjected to 300 W ultrasonic treat...

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Abstract

The invention relates to a visible-light-induced photocatalyst, a preparation method thereof and a method for degrading pesticide pollutants. The preparation method of the visible-light-induced photocatalyst comprises the following steps: adding a polyvinylpyrrolidone solution and a KMnO4 solution into an rGO dispersion liquid to obtain a first mixed solution; maintaining the first mixed solutionfor a first time under a first temperature water bath condition to obtain a second mixed solution; and maintaining the second mixed solution at a second temperature for a second time, and then performing cooling to obtain a gamma-MnOOH-rGO composite material, namely the visible-light-induced photocatalyst. By reasonably designing the distribution of different components in the composite catalyst,more active sites are exposed, meanwhile, the preparation process parameters are regulated and controlled, the crystal structure composition of the catalyst is optimized and matched, the transfer pathof photo-induced electron-hole pairs and the generation path of active species are regulated and controlled, and the problem that a traditional photocatalyst is low in catalytic activity is solved.

Description

technical field [0001] The invention belongs to the field of multifunctional water treatment and purification materials, and in particular relates to a visible light catalyst, a preparation method thereof and a method for degrading pesticide pollutants. Background technique [0002] The widespread use of pesticides has led to their frequent detection in surface and groundwater. Pesticide organic micro-pollutants such as bentazone are relatively stable in water. After being ingested by humans and animals, they will cause serious damage to the heart, kidneys, liver, etc. Great harm. Among the many micro-pollutant removal technologies, visible light catalytic oxidation has the advantages of green efficiency, good stability, and no secondary pollution, which has attracted considerable attention. [0003] It is particularly important to develop photocatalysts with high activity and specificity. So far, various types of photocatalysts have been reported, which have been optimized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J35/10C02F1/30C02F1/36C02F101/30
CPCB01J23/34B01J35/004B01J35/1004C02F1/30C02F1/36C02F2101/306C02F2101/40C02F2305/10
Inventor 李宁李瑞陈冠益颜蓓蓓马文超林法伟崔孝强
Owner TIANJIN UNIV
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