Bismuth vanadate/silver chromate heterojunction photocatalyst as well as preparation method and application thereof

A photocatalyst and heterojunction technology, applied in the field of photocatalysis, can solve the problems of increased catalyst cost, poor quality of heterojunction, weak combination, etc., to achieve improved photocatalytic activity and stability, high interface binding degree, enhanced The effect of photocatalytic activity

Active Publication Date: 2020-08-11
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the deposition of noble metals will increase the cost of the catalyst, and the quality of the heterojunction prepared by conventional methods is poor (such as weak combination, poor uniformity), etc.

Method used

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  • Bismuth vanadate/silver chromate heterojunction photocatalyst as well as preparation method and application thereof
  • Bismuth vanadate/silver chromate heterojunction photocatalyst as well as preparation method and application thereof
  • Bismuth vanadate/silver chromate heterojunction photocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of bismuth vanadate / silver chromate heterojunction photocatalyst, comprising the following steps:

[0028] S1: Preparation of bismuth vanadate by hydrothermal method:

[0029] a. Take 2.5mmol Bi(NO 3 ) 3 ·5H 2 Add O to 50mL of 2mol / L dilute nitric acid solution / take 2.5mmol NH 4 VO 3 Add it to 50mL of 2mol / L ammonia solution, stir for 0.5h to promote its complete dissolution, and obtain clear and transparent Bi(NO 3 ) 3 -HNO 3 / NH 4 VO 3 -NH 3 ·H 2 O solution; get 0.5g sodium dodecylsulfonate (SDS), join in 20mL high-purity water, stir and promote its complete dissolution, obtain SDS aqueous solution;

[0030] b. to Bi(NO 3 ) 3 -HNO 3 Add SDS aqueous solution drop by drop to the solution, after mixing evenly, slowly add NH 4 VO 3 -NH 3 ·H 2O solution, stirred for 0.5h, then adjusted the pH to 7.0 with 2mol / L ammonia solution, and continued to stir for 2h, then transferred the reaction solution to a high-pressure reactor, then hydro...

Embodiment 2

[0035] A preparation method of bismuth vanadate / silver chromate heterojunction photocatalyst, comprising the following steps:

[0036] S1: Preparation of bismuth vanadate by hydrothermal method: same as Example 1;

[0037] S2: Preparation of heterojunction photocatalyst:

[0038] a. Accurately weighed 0.5g BiVO 4 , 0.2248g AgNO 3 and 0.1285g K 2 CrO 4 , the AgNO 3 、K 2 CrO 4 Respectively dubbed into 100mL solution;

[0039] b. Weigh 0.5g BiVO 4 Add 100mL distilled water, after ultrasonic dispersion, under the condition of magnetic stirring, add 100mL AgNO 3 solution, and continue to stir for 12h, then slowly drop 100mL K 2 CrO 4 Solution, a brick-red precipitate was generated, and continued to stir for reaction 1, then let the precipitate stand for 4 hours, centrifuged at a speed of 4500r / min to separate it from water, and washed the lower precipitate with water 6 times to remove unreacted reagents and impurities, 80 ℃ vacuum drying for 6h to obtain BiVO 4 BiVO wi...

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Abstract

The invention discloses a bismuth vanadate/silver chromate heterojunction photocatalyst as well as a preparation method and application thereof. The heterojunction photocatalyst is formed by assembling BiVO4 and nano Ag2CrO4 selectively deposited on the crystal face of the BiVO4 (040), the BiVO4 is of a chamfered square bipyramid microstructure, and the mass of the BiVO4 accounts for 70%-80% of the total mass of the heterojunction photocatalyst. The preparation method comprises the following steps: S1, preparing bismuth vanadate by a hydrothermal method; S2, preparing the heterojunction photocatalyst, wherein adding BiVO4 into distilled water, carrying out ultrasonic dispersion, adding a certain amount of AgNO3 solution under the condition of magnetic stirring, slowly dropwise adding a certain amount of K2CrO4 solution to generate a brick red precipitate, continuously stirring to react for 1-2 hours, standing, precipitating, aging for 12-24 hours, centrifuging, washing with water for 6times, and carrying out vacuum drying. Compared with a traditional deposition method, the heterojunction formed by the selective adsorption deposition method is better in stability, higher in interface bonding degree and higher in visible light catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a method for preparing a bismuth vanadate / silver chromate heterojunction photocatalyst, in particular to a silver chromate-modified bismuth vanadate composite photocatalyst, which is mainly used for composite photocatalysts in Applications in visible light catalytic degradation of organic dyes. Background technique [0002] Bismuth vanadate as a non-TiO 2 Based on visible light semiconductor catalysts, the band gap (monoclinic phase) is 2.4eV, non-toxic, cheap, good color, and has many excellent physical and chemical properties, so it has attracted widespread attention in the field of photocatalysis. Although bismuth vanadate has good visible light absorption properties, there are still problems such as weak surface adsorption capacity and easy recombination of photogenerated holes and electrons, resulting in low actual quantum efficiency. [0003] In order to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C02F1/30C02F101/30C02F101/38
CPCB01J35/004B01J23/685C02F1/30C02F2305/10C02F2101/308C02F2101/40C02F2101/38Y02W10/37
Inventor 陆诚信张现峰马苗苗
Owner BENGBU COLLEGE
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