Bismuth vanadate-franklinite composite photocatalyst, and preparation method and application thereof

A zinc-iron spinel, composite light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of easy recombination of photogenerated electrons and holes, low photocatalytic efficiency, separation and recovery Difficulties and other problems, to achieve the effect of convenient separation and recycling, high catalytic efficiency and high purity

Inactive Publication Date: 2018-10-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, bismuth monoclinic vanadate photocatalysts have two major defects: one is that photogenerated electrons and holes are easily recombined, resulting in low photocatalytic efficiency;

Method used

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  • Bismuth vanadate-franklinite composite photocatalyst, and preparation method and application thereof
  • Bismuth vanadate-franklinite composite photocatalyst, and preparation method and application thereof
  • Bismuth vanadate-franklinite composite photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Preparation of m-BiVO by sol-gel technique 4 Precursor body fluid: prepare ethylene glycol solution according to the volume ratio of ethylene glycol and deionized water as 1:2, weigh 9.7g of bismuth nitrate pentahydrate and 15.37g of citric acid, dissolve them in 25ml of ethylene glycol aqueous solution, and keep stirring Solution A was obtained; 2.34 g of ammonium metavanadate was weighed and dissolved in 25 ml of ethylene glycol aqueous solution and stirred continuously to obtain solution B. Add solution B dropwise to solution A at a rate of 30 drops / min under continuous stirring, and adjust the pH value to 9 with ammonia water, heat and stir in a water bath to evaporate part of the solvent to obtain m-BiVO 4 Precursor fluid.

[0052] Step 2: Preparation of ZnFe by self-propagating sol-gel combined with high-temperature calcination 2 o 4 Nano powder. The ethylene glycol solution was prepared according to the volume ratio of ethylene glycol and deionized wa...

Embodiment 2

[0061] Step 1: Preparation of m-BiVO by sol-gel technique 4 Precursor body fluid: prepare ethylene glycol solution according to the volume ratio of ethylene glycol and deionized water as 1:2.5, weigh 6.7g of bismuth nitrate pentahydrate and 15g of citric acid into 20ml of ethylene glycol aqueous solution, and keep stirring to obtain solution A Dissolve 1.05g of ammonium metavanadate into 20ml of ethylene glycol aqueous solution and keep stirring to obtain solution B. Add solution B dropwise to solution A at a rate of 30 drops / min under continuous stirring, adjust the pH value to 7 with ammonia water, heat and stir in a water bath to evaporate part of the solvent to obtain m-BiVO 4 Precursor fluid.

[0062] Step 2: Preparation of ZnFe by self-propagating sol-gel combined with high-temperature calcination 2 o 4 Nano powder. Prepare the ethylene glycol solution according to the volume ratio of ethylene glycol and deionized water as 1:2, weigh 18.05 g of ferric nitrate nonahyd...

Embodiment 3

[0066] Step 1: Preparation of m-BiVO by sol-gel technique 4 Precursor body fluid: prepare ethylene glycol solution according to the volume ratio of ethylene glycol and deionized water as 1:2, weigh 8.54g of bismuth nitrate pentahydrate and 19g of citric acid, dissolve them in 35ml of ethylene glycol aqueous solution, and keep stirring to obtain a solution A: Dissolve 3.52g of ammonium metavanadate in 35ml of ethylene glycol aqueous solution and keep stirring to obtain solution B. Add solution B dropwise to solution A at a rate of 30 drops / min under continuous stirring, and adjust the pH value to 8.5 with ammonia water, heat and stir in a water bath to evaporate part of the solvent to obtain m-BiVO 4 Precursor fluid.

[0067] Step 2: Preparation of ZnFe by self-propagating sol-gel combined with high-temperature calcination 2 o 4 Nano powder. The ethylene glycol solution was prepared according to the volume ratio of ethylene glycol and deionized water as 1:2, and 22.52 g of ...

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Abstract

The invention discloses a bismuth vanadate-franklinite composite photocatalyst, and a preparation method and application thereof. The photocatalyst comprises an m-BiVO4 substrate, wherein ZnFe2O4 is dispersed on the surface of the m-BiVO4 substrate, and a mass ratio of the ZnFe2O4 to the m-BiVO4 substrate is (5-20): (95-80). A monoclinic bismuth vanadate-franklinite composite photocatalysis material is prepared by using a low-temperature self-propagating sol-gel method and a calcination method; the photocatalytic properties of the prepared material are tested by using simulated visible light;and the superior photocatalytic properties of the material are proved by degradation of the non-biodegradable organic pollutant methylene orange. The material belongs to inorganic photocatalysis materials, and has high photocatalytic activity and good application prospects in environmental protection. The preparation method has the advantages of controllable morphology of monoclinic bismuth vanadate, good compounding between franklinite and monoclinic bismuth vanadate, uniform dispersion and formation of effective p-n heterojunctions.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and relates to a photocatalyst, a preparation method and its application, in particular to a bismuth vanadate-zinc-iron spinel composite photocatalyst, a preparation method and its application. Background technique [0002] In recent years, semiconductor photocatalysis has been outstanding in water pollution treatment and has been at the forefront of environmental governance research. Its advantages are high efficiency, low cost, wide selectivity, low reaction temperature requirements, small energy requirements, and complete degradation of pollutants, etc. [1-4] . [0003] Among them, bismuth monoclinic vanadate (m-BiVO 4 ) has attracted wide attention due to its narrow band gap (2.45eV), good chemical stability, low preparation cost, direct use of visible light, non-toxic and environmental protection, etc. [5] , has broad application prospects in photocatalytic oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J37/08B01J37/03C02F1/30C02F101/30
CPCB01J23/005B01J23/8472B01J35/0033B01J35/004B01J37/0018B01J37/036B01J37/038C02F1/30C02F2101/308C02F2305/10
Inventor 马爱琼马孝瑜李辉高云琴侯星
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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