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BiVO4/BiOI heterojunction compound photocatalyst and preparation method and application thereof

A technology of composite light and catalyst, applied in the field of photocatalysis, can solve the problems of limited photocatalytic performance of semiconductor materials, easy recombination of photogenerated carriers, etc., achieve good visible light absorption performance, simple preparation method and accelerated separation effect

Active Publication Date: 2017-02-22
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the slow photoelectron-hole separation in monomeric photocatalysts and the easy recombination of photogenerated carriers, the photocatalytic performance of semiconductor materials is limited, and the construction of composite materials through semiconductor recombination can accelerate electron-hole separation and improve material efficiency. photocatalytic performance [5]

Method used

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  • BiVO4/BiOI heterojunction compound photocatalyst and preparation method and application thereof
  • BiVO4/BiOI heterojunction compound photocatalyst and preparation method and application thereof
  • BiVO4/BiOI heterojunction compound photocatalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] BiVO 4 / BiOI heterojunction composite photocatalyst preparation method:

[0041] (1) Preparation of three-dimensional layered microsphere structure BiOI: prepared by hydrothermal synthesis. 2.0mmol Bi(NO 3 ) 3 ·5H 2 O was added to 30mL of ethylene glycol, and magnetically stirred to dissolve it to obtain solution A; at the same time, 2.0mmol KI and 0.5g polyvinylpyrrolidone (PVP) were added to 30mL of ultrapure water in turn, and magnetically stirred to make it Dissolve to obtain the solution B; then add the above solution B dropwise to the above solution A under magnetic stirring to obtain a suspension, then use 2.0mol / L NaOH solution to adjust the pH of the suspension to 7, and then continue the magnetic Stir for 60 minutes; after stirring, transfer the suspension to a stainless steel high-pressure reactor equipped with a polytetrafluoroethylene lining, and put it into an electric constant temperature blast drying oven for heat treatment at 180°C for 24 hours; aft...

Embodiment 2

[0049] BiVO 4 / BiOI heterojunction composite photocatalyst preparation method: prepared under hydrothermal conditions by ion exchange method, the difference from Example 1 is that the Bi 2 WO 6 The molar ratio with BiOI is 1:9. Weigh 1.0mmol BiOI obtained above and add it into 30mL ultrapure water, and ultrasonically disperse for 45min to obtain a dispersion; at the same time, add 0.1mmol NH 4 VO 4 and 0.25g polyvinylpyrrolidone (PVP) were added to 30mL ultrapure water in turn, heated to 80°C and magnetically stirred to dissolve completely to obtain a solution; then NH 4 VO 4 Dissolve the solution, and then continue magnetic stirring for 30 minutes to obtain a mixed solution; after the stirring is completed, transfer the mixed solution to a stainless steel high-pressure reactor equipped with a polytetrafluoroethylene liner, and put it in an electric constant temperature blast drying oven for heat treatment at 180°C for 16 hours After the reaction, the reactor was cooled t...

Embodiment 3

[0051] BiVO 4 / BiOI heterojunction composite photocatalyst preparation method: prepared under hydrothermal conditions by ion exchange method, the difference from Example 1 is that the Bi 2 WO 6 The molar ratio with BiOI is 5:5. Weigh the 1.0mmol BiOI obtained above and add it into 30mL ultrapure water, ultrasonically disperse for 30min to obtain a dispersion; at the same time, add 0.5mmol NH 4 VO 4 and 0.5g polyvinylpyrrolidone (PVP) were sequentially added to 30mL ultrapure water, heated to 80°C and magnetically stirred to dissolve completely to obtain a solution; then NH was added dropwise to the above BiOI dispersion 4 VO 4 Dissolve the solution, and then continue magnetic stirring for 45 minutes to obtain a mixed solution; after the stirring is completed, transfer the mixed solution to a stainless steel high-pressure reactor equipped with a polytetrafluoroethylene liner, and put it into an electric constant temperature blast drying oven for heat treatment at 160°C for ...

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Abstract

The invention belongs to the field of photocatalysis, and particularly relates to a BiVO4 / BiOI heterojunction compound photocatalyst and a preparation method and application thereof. The BiVO4 / BiOI heterojunction compound photocatalyst is composed of BiVO4 and BiOI, wherein the mole ratio of BiVO4 to BiOI is 1:99-99:1. In preparation, BiOI of a three-dimensional layering microsphere structure is first prepared through a hydrothermal synthesis method, and then through an ion exchange method, the BiVO4 / BiOI heterojunction compound photocatalyst is obtained under a hydrothermal condition. The preparation method is simple in technology, easy to control and low in cost; the BiVO4 / BiOI heterojunction structure with visible-light response is constructed, and the BiVO4 / BiOI heterojunction compound photocatalyst accelerates separation of photon-generated vectors, lowers the compound probability of photo-induced electron-hole pairs, has efficient photocatalytic activity and stability under visible light, efficiently kills and degrades harmful microorganisms and dye contaminants in a water body, and has quite high practical value and potential application prospects in the fields of water body purifying, ocean antifouling and others.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a BiVO 4 / BiOI heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] In today's world, environmental and energy problems are becoming more and more serious. All kinds of harmful pollutants accumulate, migrate and transform in the water, soil and air environment, seriously destroying the ecological balance and endangering human life and health. With the rapid development of the economy, the consumption of energy is getting faster and faster. What's more serious is that the development of traditional energy sources has further aggravated the pollution of the environment. In order to achieve sustainable development, it is imperative to solve these two problems. [0003] Due to the advantages of cleanness, friendliness and environmental protection, semiconductor photocatalysis technology has great potential in solving energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F1/50C02F101/38
CPCC02F1/30C02F1/50B01J27/06C02F2305/10C02F2101/308C02F2101/38B01J35/39Y02W10/37
Inventor 张昊鞠鹏张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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