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A photo-assisted single-atom catalytic method for the degradation of glyphosate in water

A medium glyphosate, light-assisted technology, applied in chemical instruments and methods, oxidized water/sewage treatment, illuminated water/sewage treatment, etc. The effect of high atom utilization, high activity and easy promotion

Active Publication Date: 2020-12-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method for light-assisted single-atom catalytic degradation of glyphosate in water. The method uses less single-atom catalyst, high atom utilization rate, and cheap and easy-to-obtain transition metal copper, which solves the problem of Solved the problem of high catalyst cost in industry and the problem of single atom agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Synthesis of Cu-imidazole coordination compound (Cu-ICC) by ball milling method, the specific process is:

[0034] Take Cu(NO 3 ) 2 , 2-methylimidazole, PVP (polyvinylpyrrolidone) and methanol were added into an agate bottle, and ball milled at 500rpm for 1h to obtain a Cu-imidazole coordination compound (Cu-ICC); wherein the methanol with a mass percentage concentration of 96% was used as a solvent , methanol and Cu(NO 3 ) 2 The mass ratio is 5:1, Cu(NO 3 ) 2 The mass ratio of :2-methylimidazole:PVP is 1:3:4.

[0035] (2) Synthesis of Cu-ICC / g-C 3 N 4 , the specific process is:

[0036] Take the Cu-imidazole coordination compound in step (1) and melamine (MA) to grind at a mass ratio of 1:1, pass through a 200-mesh sieve, and then place it in a tube furnace under a nitrogen atmosphere at 3°C ​​min -1 The heating rate was raised to 300°C and calcined for 2 hours to obtain the single-atom catalyst Cu-ICC / g-C 3 N 4 .

[0037] (3) Light-assisted single-atom...

Embodiment 2

[0041] (1) Synthesis of Cu-imidazole coordination compound (Cu-ICC) by ball milling method, the specific process is:

[0042] Take Cu(NO 3 ) 2 , 2-methylimidazole, PVP (polyvinylpyrrolidone) and methanol were added into an agate bottle, and ball milled at 800rpm for 3h to obtain a Cu-imidazole coordination compound (Cu-ICC); wherein the methanol with a mass percentage concentration of 96% was used as a solvent , methanol and Cu(NO 3 ) 2 The mass ratio of Cu(NO 3 ) 2 The mass ratio of :2-methylimidazole:PVP is 3:6:6.

[0043] (2) Synthesis of Cu-ICC / g-C 3 N 4 , the specific process is:

[0044] Take the Cu-imidazole coordination compound in step (1) and melamine (MA) to grind at a mass ratio of 3:1, pass through a 300-mesh sieve, and then place it in a tube furnace under a nitrogen atmosphere at 6°C min -1 The heating rate was raised to 600°C and calcined for 4 hours to obtain the single-atom catalyst Cu-ICC / g-C 3 N 4 .

[0045] (3) Light-assisted single-atom cataly...

Embodiment 3

[0049] (1) Synthesis of Cu-imidazole coordination compound (Cu-ICC) by ball milling method, the specific process is:

[0050] Take Cu(NO 3 ) 2 , 2-methylimidazole, PVP (polyvinylpyrrolidone) and methanol were added into an agate bottle, and ball milled at 1000rpm for 5h to obtain a Cu-imidazole coordination compound (Cu-ICC); wherein the methanol with a mass percentage concentration of 96% was used as a solvent , methanol and Cu(NO 3 ) 2 The mass ratio is 10:1, Cu(NO 3 ) 2 The mass ratio of :2-methylimidazole:PVP is 5:9:8.

[0051] (2) Synthesis of Cu-ICC / g-C 3 N 4 , the specific process is:

[0052] Take the Cu-imidazole coordination compound in step (1) and melamine (MA) to grind at a mass ratio of 5:1, pass through a 400-mesh sieve, and then place it in a tube furnace under a nitrogen atmosphere at 8 °C min -1 The heating rate was raised to 900°C and calcined for 6 hours to obtain the single-atom catalyst Cu-ICC / g-C 3 N 4 .

[0053] (3) Light-assisted single-ato...

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Abstract

The invention discloses a method for degrading glyphosate in water through light assistance single-atom catalysis. The method comprises the following steps of weighing and adding Cu(NO3)2, 2-methylimidazole, PVP and methyl alcohol into an agate bottle, and performing ball milling for 1-5 h to obtain a Cu-imidazole coordination compound; mixing the Cu-imidazole coordination compound and melamine for grinding, screening the mixture through a 200-400-mesh screen, and then placing the mixture into a tube furnace at the nitrogen atmosphere for calcination to obtain a single-atom catalyst Cu-lCC / g-C3N4; weighing sewage containing glyphosate, adding the catalyst, performing stirring under the dark condition for 20-60 min, achieving the adsorption balance, adding potassium peroxymonosulfate sulfate into sewage under xenon lamp irradiation, and performing ultrasonic treatment under the frequency of 50-70 kHz for 1-5 h, wherein the mass ratio of sewage to potassium peroxymonosulfate sulfate is 20:1-30:1. The removal rate for degrading glyphosate through potassium peroxymonosulfate sulfate activation through the light assistance single-atom reaches 90-100%.

Description

technical field [0001] The invention relates to a technology for treating organic pollutants in water bodies. Specifically, it relates to a method for degrading glyphosate in water by activating peroxymonosulfate to generate sulfate radicals with a light-assisted single-atom catalyst. Background technique [0002] Glyphosate (Glyphosate) commonly known as: Roundup, the scientific name is N-phosphonic acid methyl-glycine. Monsanto Chemical Company of the United States first screened and synthesized glyphosate in the 1960s. In the 1970s, my country began to conduct research on glyphosate. Glyphosate has a wide range of uses and can be used on crops and non-crops. Compared with chlorinated pesticides, glyphosate is less toxic, more effective and less costly. It has been registered for use all over the world. As of July 2012, there are about 130 registered glyphosate manufacturers in my country. According to reports, China supplies nearly 80% of glyphosate pesticides to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F1/36C02F1/72C02F101/30
CPCB01J27/24B01J35/004C02F1/30C02F1/36C02F1/725C02F2101/306
Inventor 丁辉郝利静
Owner TIANJIN UNIV
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