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CuS/Bi2WO6 heterojunction photocatalyst as well as preparation method and application thereof

A photocatalyst and heterojunction technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problems of limited contact area, environmental pollution by other substances, preparation The process is cumbersome and other problems, to achieve the effect of enhanced absorption range, simple preparation process and low cost

Active Publication Date: 2018-11-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, most of the composite photocatalysts are prepared by multi-step growth method and the contact area of ​​the two semiconductors in the heterojunction is limited, the preparation process is cumbersome, and it is easy to produce other toxic substances to pollute the environment, etc.

Method used

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  • CuS/Bi2WO6 heterojunction photocatalyst as well as preparation method and application thereof
  • CuS/Bi2WO6 heterojunction photocatalyst as well as preparation method and application thereof
  • CuS/Bi2WO6 heterojunction photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A CuS / Bi 2 WO 6 Heterojunction photocatalyst, its preparation method comprises the following steps:

[0026] (1) At room temperature, weigh 0.25 mmol of copper acetate solid and dissolve it in 40 mL of ethylene glycol to form solution A;

[0027] (2) Weigh 1mmol thiourea and dissolve it in 40mL ethylene glycol to form solution B;

[0028] (3) Mix solution A and solution B evenly, add 1mmol Bi to the mixed solution 2 WO 6 Solid powder, stir evenly;

[0029] (4) 36% acetic acid solution was dripped dropwise into the mixed solution obtained in step (3) under stirring condition, until the pH value of the mixed solution was 4, and continued to stir for 30 min;

[0030] (5) Transfer the mixed solution obtained in step (4) into a 100mL hydrothermal kettle, react at 160°C for 12h, cool naturally to room temperature, alternately wash with deionized water and absolute ethanol, and dry at 80°C to prepare have to.

Embodiment 2

[0032] A CuS / Bi 2 WO 6 Heterojunction photocatalyst, its preparation method comprises the following steps:

[0033] (1) At room temperature, weigh 1 mmol of copper acetate solid and dissolve it in 40 mL of ethylene glycol to form solution A;

[0034] (2) Weigh 4mmol thiourea and dissolve it in 40mL ethylene glycol to form solution B;

[0035] (3) Mix solution A and solution B evenly, add 1mmol Bi to the mixed solution 2 WO 6 Solid powder, stir evenly;

[0036] (4) 36% acetic acid solution was dripped dropwise into the mixed solution obtained in step (3) under stirring condition, until the pH value of the mixed solution was 5, and continued to stir for 30 min;

[0037] (5) Transfer the mixed solution obtained in step (4) into a 100mL hydrothermal kettle, react at 150°C for 12h, cool naturally to room temperature, alternately wash with deionized water and absolute ethanol, and dry at 80°C to prepare have to.

Embodiment 3

[0039] A CuS / Bi 2 WO 6 Heterojunction photocatalyst, its preparation method comprises the following steps:

[0040] (1) At room temperature, weigh 0.25 mmol of copper acetate solid and dissolve it in 40 mL of ethylene glycol to form solution A;

[0041] (2) Weigh 4mmol thiourea and dissolve it in 40mL ethylene glycol to form solution B;

[0042] (3) Mix solution A and solution B evenly, add 1.5mmol Bi to the mixed solution 2 WO 6 Solid powder, stir evenly;

[0043] (4) 36% acetic acid solution was dripped dropwise into the mixed solution obtained in step (3) under stirring condition, until the pH value of the mixed solution was 6, and continued to stir for 30 min;

[0044] (5) Transfer the mixed solution obtained in step (4) into a 100mL hydrothermal kettle, react at 140°C for 12h, cool naturally to room temperature, alternately wash with deionized water and absolute ethanol, and dry at 80°C to prepare have to.

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Abstract

The invention provides a CuS / Bi2WO6 heterojunction photocatalyst as well as a preparation method and application thereof. In the preparation method, Bi2WO6 is added in a CuS precursor solution with thiourea and cupric acetate as raw materials, CuS / Bi2WO6 is synthesized in situ with a co-precipitation-hydrothermal method, and the CuS / Bi2WO6 heterojunction photocatalyst of a nanoparticle structure can be prepared without a surfactant and a complex technological condition. The preparation method is simple in preparation process, low in cost and strong in controllability of the reaction conditionand does not have toxicity; micro-particles of the prepared photocatalyst are CuS nano-sheets to be dispersively distributed on the surfaces of Bi2WO6 nanoparticles, and two phase interfaces form a heterojunction structure, so that the absorption range of visible lights is expanded, and the photocatalyst has more excellent photocatalytic activity compared with a single CuS semiconductor and has better acid resistance in photocatalytic reaction compared with single Bi2WO6; and meanwhile, the photocatalyst has relatively high crystallinity without generation of other impurities.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a CuS / Bi 2 WO 6 Heterojunction photocatalyst and its preparation method and application. Background technique [0002] Industrial organic wastewater such as medicine, printing and dyeing, and papermaking has a large amount of discharge and contains a large amount of refractory pollutants that can have adverse effects on human health. It is a major pollution source that causes damage to the water ecological environment and seriously affects the utilization of water resources. Photocatalytic technology can use semiconductor photocatalytic materials to convert "green" solar energy into chemical energy or electrical energy, and effectively remove organic pollutants in water under mild reaction conditions. It is one of the most potential technologies to solve energy and environmental problems. . [0003] In recent years, in order to improve the photocatalytic activity and st...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/03B01J37/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J23/002B01J27/04B01J37/031B01J37/10C02F2101/38C02F2101/40C02F2101/36C02F2101/308C02F2305/10B01J35/23B01J35/39
Inventor 郭家秀周后任方宁杰袁山东
Owner SICHUAN UNIV
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