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Photo-anode for slowing down corrosion in photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, preparation method and application thereof

A technology of photoelectric catalysis and wastewater treatment, applied in the direction of light water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. Photoelectrode and other problems to achieve the effect of inhibiting self-oxidation corrosion, easy recycling and slowing down photocorrosion

Inactive Publication Date: 2021-01-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing photoelectrode materials have the problem of easy photocorrosion, that is, they are unstable in the photocatalytic process, and the photogenerated carrier transfer efficiency is low, which leads to the retention of photogenerated holes on the electrode / electrolyte surface, thereby corroding the photoelectrode itself.

Method used

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  • Photo-anode for slowing down corrosion in photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, preparation method and application thereof
  • Photo-anode for slowing down corrosion in photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, preparation method and application thereof
  • Photo-anode for slowing down corrosion in photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example compares the photoelectrochemical properties of different electrode films.

[0050] (1) BiVO 4 Preparation of the electrode film: Before preparing the electrode film, the fluorine-doped tin oxide substrate (1×3cm 2 ) immersed in the mixture of isopropanol: acetone: ultrapure water = 1:1:1 (volume ratio) and sonicate the front and back sides for 15 minutes respectively, and the Bi(NO 3 ) 3 ·5H 2 O (0.485g) dissolved in 150mL ethylene glycol and water (EG: H 2 O=2:1, v:v) in the mixed solution as the electrolyte, deposited at a constant voltage of -0.6V vs.Ag / AgCl for 7, 8, 9, 10min to obtain the Bi metal electrode film; 0.106g acetylacetonate oxygen Vanadium was dissolved in 2.0mL dimethyl sulfoxide solvent as the source of vanadium; 200 μL dimethyl sulfoxide solution of vanadyl acetylacetonate was evenly added dropwise on the Bi metal film, so that the dimethyl sulfoxide of vanadyl acetylacetonate The surface of the Bi metal film was immersed in the su...

Embodiment 2

[0059] In this embodiment, the photocurrent variation with time of different electrode films is compared.

[0060] (1) BiVO 4 Preparation of the electrode film: Before preparing the electrode film, the fluorine-doped tin oxide substrate (1×3cm 2 ) immersed in the mixture of isopropanol: acetone: ultrapure water = 1:1:1 (volume ratio) and sonicate the front and back sides for 15 minutes respectively, and the Bi(NO 3 ) 3 ·5H 2 O (0.485g) dissolved in 150mL ethylene glycol and water (EG: H 2 The mixed solution of O=2:1, v:v) was used as the electrolyte, and the Bi metal electrode film was obtained by depositing at a constant voltage of -0.6V vs. Ag / AgCl for 7min. Dissolve 0.106 g of vanadyl acetylacetonate in 2.0 mL of dimethyl sulfoxide solvent as a source of vanadium. 200 μL of dimethyl sulfoxide solution of vanadyl acetylacetonate was evenly added dropwise on the Bi metal film, so that the dimethyl sulfoxide solution of vanadyl acetylacetonate was immersed in the surface ...

Embodiment 3

[0069] This example compares the difference in the performance of different photoanodes for photocatalytic degradation of ciprofloxacin (CIP).

[0070] (1) BiVO 4 、BiVO 4 / Cu 2 O. BiVO 4 / Cu 2 The preparation method of O / 0.05 Co-Pi electrode film is with the step (1) (2) (3) in the embodiment 2;

[0071] (2) Using 30mg / L ciprofloxacin pollutant as the electrolyte, the photoelectrocatalytic degradation activity of different prepared photoanodes was studied under the condition of 0.6V vs. Ag / AgCl voltage and AM1.5G illumination.

[0072] (3) A three-electrode quartz electrolytic cell with a volume of 100mL is used as a reactor, and a total of 50mL of 30mg / L ciprofloxacin pollutants and 0.1M potassium phosphate buffer are added to the reactor, and the prepared photoanode is immersed in the electrolyte , carry out the reaction under normal temperature (25°C) conditions, and take samples at fixed points for analysis;

[0073] The degradation curves of different photoanodes fo...

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Abstract

The invention discloses a photo-anode for slowing down corrosion in a photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, a preparation method and applicationthereof. The method comprises the following steps: depositing a Bi metal film on the surface of a fluorine-doped tin oxide substrate under a dark condition; and dropwise adding a solution of vanadylacetylacetonate, annealing, converting the Bi metal film into a BiVO4 substrate film, soaking the BiVO4 substrate film in an electrolyte solution containing a chelating agent, applying a constant potential to obtain an electrode film, and electrodepositing cobalt phosphate to obtain the photo-anode. According to the method, an electrode film material is synthesized through simple photo-assisted electro-deposition, rapid capture and release of holes are completed in the process of photoelectrocatalytic degradation of organic micro-pollutants in water by utilizing the cyclic process of the valence state of a cobalt element in CoPi, and self-oxidation corrosion of an internal BiVO4 / Cu2O photoelectrode is inhibited. The electrode film is easy to recycle, the crystal structure of the material is not changed after degradation experiments, and the electrode film is an environment-friendly material.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a photoanode which uses amorphous cobalt phosphate Co-Pi to slow down corrosion in the photoelectric catalytic wastewater treatment process, a preparation method and an application. Background technique [0002] Photocatalytic degradation of organic micro-pollutants in water, because it can partially utilize solar energy, it can be degraded at normal temperature and pressure, the degradation efficiency is high, the catalyst is easy to collect, and there is no need to adjust pH or add other co-catalysts. The field of biological science has received more and more attention and attention from researchers. However, due to the serious photogenerated electron-hole pair recombination in traditional photocatalytic materials and the vulnerability of electrode materials to photochemical corrosion during the catalytic process, the industrial application of this t...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/467C02F101/34C02F101/36C02F101/38
CPCC02F1/30C02F1/4672C02F2001/46152C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 万金泉马邕文李雪王艳闫志成
Owner SOUTH CHINA UNIV OF TECH
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