a bi 2 wo 6 /zns heterojunction photocatalyst and preparation method thereof

A photocatalyst, heterojunction technology

Active Publication Date: 2022-02-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its small absorption range of visible light, its photocatalytic application is limited. Therefore, Bi 2 WO 6 Combining base photocatalytic materials with other materials to improve their photocatalytic performance is a research hotspot in recent years.
[0005] On the other hand, at present, 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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  • a bi <sub>2</sub> wo <sub>6</sub> /zns heterojunction photocatalyst and preparation method thereof
  • a bi <sub>2</sub> wo <sub>6</sub> /zns heterojunction photocatalyst and preparation method thereof
  • a bi <sub>2</sub> wo <sub>6</sub> /zns heterojunction photocatalyst and preparation method thereof

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preparation example Construction

[0030] Bi 2 WO 6 Preparation: Weigh 9.701g of bismuth nitrate pentahydrate and 3.299g of sodium tungstate dihydrate according to the molar ratio of 2:1, dissolve them in 40ml of distilled water (total is 80-100ml), mix the two after completely dissolving, transfer to Put it into a high-pressure hydrothermal reaction kettle, and keep it in a vacuum oven at 150°C for 18h. Naturally cool to room temperature, filter, wash the reaction solid several times with deionized water and absolute ethanol, put it in a vacuum drying oven at 60°C and dry for 5 hours to obtain bismuth tungstate.

[0031] Preparation of ZnS: Put 20mmol of zinc acetate dihydrate and 20mmol of thioacetamide into a beaker respectively, add appropriate amount of deionized water, and magnetically stir to dissolve. Then pour the liquid in the two beakers into a dry and clean 50ml beaker, add 0.5gPVP, stir magnetically for 30min, pour it into a 50ml high-pressure hydrothermal reaction kettle, add water to 95% of the...

Embodiment 1

[0035] At room temperature, weigh 0.01g of bismuth tungstate powder and dissolve it in a mixed solvent formed by 10mL of absolute ethanol and 20mL of deionized water, ultrasonically disperse for 30min and mix evenly, then add 0.2g of ZnS powder, stir and mix evenly to obtain a mixed suspension ; The resulting mixed suspension was moved into a 100mL hydrothermal reaction kettle and stirred at 130°C for a hydrothermal reaction for 5h, cooled to room temperature naturally, washed several times alternately with deionized water and absolute ethanol, and placed in a vacuum oven for 60 ℃ drying.

Embodiment 2

[0037] At room temperature, weigh 0.01g of bismuth tungstate solid powder and dissolve it in a mixed solvent formed by 10mL of absolute ethanol and 20mL of deionized water, ultrasonically disperse for 30min and mix evenly, then add 0.1g of ZnS solid powder, stir and mix evenly to obtain a mixed suspension Turbid liquid; transfer the resulting mixed suspension into a 100mL hydrothermal reaction kettle and stir at 130°C for 5h of hydrothermal reaction, naturally cool to room temperature, alternately wash with deionized water and absolute ethanol several times, and place in a vacuum oven Dry at 60°C.

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Abstract

The invention discloses a Bi 2 WO 6 / ZnS heterojunction photocatalyst and its preparation method, by adding Bi 2 WO 6 Synthesis of Bi by Hydrothermal Reaction with ZnS 2 WO 6 / ZnS heterojunction material. The Bi 2 WO 6 / ZnS heterojunction photocatalyst composed of Bi 2 WO 6 and ZnS composition, Bi 2 WO 6 The mass ratio to ZnS is 1:(4~20), among them, Bi 2 WO 6 Wrapping or embedding on the surface of ZnS nanospheres forms a nanosphere structure, and the two phase interfaces form a heterojunction. The prepared Bi 2 WO 6 / ZnS photocatalyst has high crystallinity, and no other impurities are produced, and the absorption range of visible light is enhanced by forming a heterojunction structure, which is better than single ZnS and Bi 2 WO 6 More excellent visible light catalytic activity.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, in particular to a Bi 2 WO 6 / ZnS heterojunction photocatalyst and preparation method thereof. Background technique [0002] With the development of industry, the problem of water pollution is becoming more and more serious. Among them, the dye industry will produce a large amount of toxic and difficult-to-degrade colored organic waste liquid in the production process. How to effectively degrade these organic waste liquids is a technology that still needs to be vigorously developed. Rhodamine B is a kind of artificially synthesized dye with bright pink color, which widely exists in printing and dyeing wastewater. Experiments on mice have found that rhodamine B can cause sarcoma in subcutaneous tissue and is suspected to be a carcinogen. Moreover, as a xanthene dye, rhodamine B is difficult to remove through biodegradation, and a large amount of use will cause serious harm to the water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/047B01J37/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J27/047B01J35/004B01J37/10C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 郭家秀陈佳璇吕鑫周后任袁山东李建军楚英豪
Owner SICHUAN UNIV
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