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Bi2WO6/Ag3PO4 heterojunction composite 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 unfavorable electron-hole rapid separation, increased probability of bulk recombination, low photocatalytic activity, etc., achieve good visible light absorption performance, reduce the probability of recombination, simple craftsmanship

Inactive Publication Date: 2016-02-03
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the monomer Bi 2 WO 6 The migration distance of the excited electron and hole pairs is long, and the probability of bulk phase recombination increases, which is not conducive to the rapid separation of electrons and holes, resulting in relatively low photocatalytic activity.

Method used

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  • Bi2WO6/Ag3PO4 heterojunction composite photocatalyst and preparation method and application thereof
  • Bi2WO6/Ag3PO4 heterojunction composite photocatalyst and preparation method and application thereof
  • Bi2WO6/Ag3PO4 heterojunction composite photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Bi 2 WO 6 / Ag 3 PO 4 Preparation method of heterojunction composite photocatalyst:

[0043] (1) Preparation of Bi with three-dimensional layered rod-like structure by hydrothermal synthesis 2 WO 6 : Weigh 5.0mmolBi (NO 3 ) 3 ·5H 2 O was added to 30mL ultrapure water, ultrasonically dispersed for 30min, and then magnetically stirred for 30min to obtain a dispersion; at the same time, 5.0mmolNa 2 WO 4 2H 2 O was added to 30.0mL ultrapure water, and magnetically stirred until it was completely dissolved to obtain a solution; 3 ) 3 The above Na was added dropwise to the dispersion 2 WO 4 solution, to obtain a suspension, and then use 2.0mol / LNH 3 ·H 2 O solution adjusts the pH of the suspension to 7, and then continues to stir for 60 minutes; after the stirring is completed, transfer the suspension to a high-pressure reactor equipped with a polytetrafluoroethylene liner, and put it in an electric constant temperature blast drying oven for heat treatment at 16...

Embodiment 2

[0052] Bi 2 WO 6 / Ag 3 PO 4 Preparation method of heterojunction composite photocatalyst:

[0053] Prepared by in-situ precipitation method, the difference from Example 1 is that the control of Bi 2 WO 6 with Ag 3 PO 4 The molar ratio is 1:0.75, weigh the above-mentioned 1.0mmolBi 2 WO 6 Add it into 30mL ultrapure water, ultrasonically disperse for 30min, and then magnetically stir for 30min to obtain a dispersion; then weigh 2.25mmolAgNO 3 Added to the above Bi 2 WO 6 In the dispersion liquid, stir until it is completely dissolved to obtain a mixed liquid; at the same time, add 0.75mmolNa 2 HPO 4 12H 2 O was added to 30mL ultrapure water, and magnetically stirred to make it dissolve completely to obtain a solution; then the above-mentioned Na 2 HPO 4 The solution was added dropwise to the above Bi 2 WO 6 with AgNO 3 In the mixed solution, continue to stir at room temperature in the dark for 5 hours; after the stirring is completed, the product is filtered by...

Embodiment 3

[0055] Bi 2 WO 6 / Ag 3 PO 4 Preparation method of heterojunction composite photocatalyst:

[0056] Prepared by in-situ precipitation method, the difference from Example 1 is that the control of Bi 2 WO 6 with Ag 3 PO 4 The molar ratio is 1:0.5, weigh the above-mentioned 1.0mmolBi 2 WO 6 Add it into 30mL ultrapure water, ultrasonically disperse for 30min, and then magnetically stir for 30min to obtain a dispersion; then weigh 1.5mmolAgNO 3 Added to the above Bi 2 WO 6 In the dispersion liquid, stir until it is completely dissolved to obtain a mixed liquid; at the same time, add 0.5mmolNa 2 HPO 4 12H 2 O was added to 30mL ultrapure water, and magnetically stirred to make it dissolve completely to obtain a solution; then the above-mentioned Na 2 HPO 4 The solution was added dropwise to the above Bi 2 WO 6 with AgNO 3 In the mixed solution, continue to stir at room temperature in the dark for 5 hours; after the stirring is completed, the product is filtered by su...

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Abstract

The invention belongs to the field of photocatalysis and specifically relates to a Bi2WO6 / Ag3PO4 heterojunction composite photocatalyst and its preparation method and application. The Bi2WO6 / Ag3PO4 heterojunction composite photocatalyst is composed of Bi2WO6 and Ag3PO4, wherein Ag3PO4 nanoparticles are deposited on the Bi2WO6 surface of a three-dimensional layered rod-like structure; and the molar ratio of Bi2WO6 to Ag3PO4 is 1:0.1-10. The preparation method of the invention has a simple process, is easy to control and is low-cost. A Bi2WO6 / Ag3PO4 heterojunction structure with visible light response is constructed, photon-generated carrier separation is accelerated, and recombination probability of photogenerated electron-hole pairs is minimized. The Bi2WO6 / Ag3PO4 heterojunction composite photocatalyst has high-efficiency photocatalytic activity and stability in visible light, has highly-efficient killing and degradation effects on harmful microbes and dye pollutants in a water body and has good practical value and potential application prospect in fields of water body purification, marine pollution prevention and the like.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a Bi 2 WO 6 / Ag 3 PO 4 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic technology is a technology that uses light energy for material conversion. Since 1972, Japanese scientists Fujishima and Honda first reported TiO 2 After the photolysis of water to produce hydrogen and oxygen under ultraviolet light, semiconductor photocatalysis technology has received more and more attention. [1] . For semiconductor materials, they can generate electron-hole pairs under light conditions, some of the electrons and holes meet and recombine in the bulk phase or on the surface, and the other part of the electrons migrate to the semiconductor surface, which has a strong reduction ability and can be combined with The adsorbed oxygen combines to generate strong oxidizing free radicals; and the holes that migrate to th...

Claims

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Application Information

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IPC IPC(8): B01J27/192C02F1/30C02F1/50C02F101/34C02F101/38
CPCY02W10/37
Inventor 鞠鹏张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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