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Composite silver bromide-bismuth phosphate heterojunction photocatalytic material and preparation method thereof

A composite photocatalysis and bismuth phosphate technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of easy decomposition, poor stability of silver bromide, and low photocatalytic activity of bismuth phosphate , to achieve the effects of simple preparation process, easy control of material shape and size, good stability and reusable performance

Inactive Publication Date: 2015-05-13
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a silver bromide-bismuth phosphate heterojunction composite photocatalytic material to solve the problems of low visible light catalytic activity of bismuth phosphate and poor stability of silver bromide and easy decomposition

Method used

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  • Composite silver bromide-bismuth phosphate heterojunction photocatalytic material and preparation method thereof
  • Composite silver bromide-bismuth phosphate heterojunction photocatalytic material and preparation method thereof
  • Composite silver bromide-bismuth phosphate heterojunction photocatalytic material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0038] (1) prepare bismuth phosphate:

[0039] 5mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 5 mL of dilute nitric acid solution with a concentration of 4 mol / L, magnetically stirred for 30 min until the bismuth nitrate was completely dissolved; 5 mmol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 15mL deionized water, then added dropwise to the bismuth nitrate solution, and continued to stir for 2h. Transfer the reacted suspension to a Teflon-lined stainless steel reaction kettle, seal the kettle, and conduct a hydrothermal reaction at 190°C for 24 hours. After the reaction, naturally cool to room temperature, centrifuge, wash, and vacuum-dry at 80°C for 8 hours to obtain a white Powder BiPO 4 .

[0040] (2) Preparation of silver bromide-bismuth phosphate heterojunction composite photocatalytic material:

[0041] 0.8494g of silver nitrate solid was dissolved in 10mL of deionized water, and then added dropwise with a concentration of 28%...

Embodiment 2

[0043] (1) prepare bismuth phosphate:

[0044] 5mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 0) be dissolved in 5mL, the concentration is in the dilute nitric acid solution of 4mol / L, magnetically stirred for 30min until the bismuth nitrate is completely dissolved; 5mmol ammonium dihydrogen phosphate is dissolved in 15mL deionized water, then added dropwise in the bismuth nitrate solution, continue Stir for 2h. Transfer the reacted suspension to a Teflon-lined stainless steel reaction kettle, seal the kettle, and conduct a hydrothermal reaction at 180°C for 30 hours. After the reaction, cool to room temperature naturally, centrifuge, wash, and vacuum-dry at 60°C for 12 hours to obtain a white Powder BiPO 4 .

[0045] (2) Preparation of silver bromide-bismuth phosphate heterojunction composite photocatalytic material:

[0046] 0.8494g of silver nitrate solid was dissolved in 10mL of deionized water, and then added dropwise with a concentration of 28% (mass percentage) ammonia ...

Embodiment 3

[0048] (1) prepare bismuth phosphate:

[0049] 5mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 0) be dissolved in 5mL, the concentration is in the dilute nitric acid solution of 4mol / L, magnetically stirred for 30min until the bismuth nitrate is completely dissolved; 5mmol ammonium dihydrogen phosphate is dissolved in 15mL deionized water, then added dropwise in the bismuth nitrate solution, continue Stir for 2h. Move the reacted suspension into a Teflon-lined stainless steel reaction kettle, seal the kettle, and conduct a hydrothermal reaction at 200°C for 20 hours. After the reaction, cool to room temperature naturally, centrifuge, wash, and vacuum-dry at 70°C for 9 hours to obtain a white Powder BiPO 4 .

[0050] (2) Preparation of silver bromide-bismuth phosphate heterojunction composite photocatalytic material:

[0051] Dissolve 0.8494g of silver nitrate solid in 10mL of deionized water, then add dropwise the ammoniacal liquor of 28% (mass percentage) until the precipitate...

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Abstract

The invention discloses a composite silver bromide-bismuth phosphate heterojunction photocatalytic material. Silver bromide nanoparticles are deposited on the bismuth phosphate surface of a micron-sized rod structure, wherein the molar weight of silver bromide is 5.5-14.6% of that of bismuth phosphate. The composite silver bromide-bismuth phosphate heterojunction photocatalytic material has the advantages that agglomeration is not generated; compared with bismuth phosphate and silver bromide, the visible-light catalytic activity is obviously improved; the stability and the performance for repeated use are good; the preparation technology is simple, and the shapes and sizes of materials are easy to control.

Description

technical field [0001] The invention belongs to the technical field of composite materials and their preparation, and in particular relates to a silver bromide-bismuth phosphate heterojunction composite photocatalytic material, and also relates to a preparation method of the composite photocatalytic material. Background technique [0002] BiPO 4 It is a typical bismuth-based multifunctional material with a band gap of 3.85eV and stable properties. It has been widely used in the fields of phosphate ion sensors, microwave media, co-precipitation and separation of radioactive elements, etc. However, in the field of photocatalysis However, its application is limited because it only responds to ultraviolet light and has low catalytic performance under visible light. Silver bromide, with a band gap of 2.60eV, can absorb visible light below 500nm, but it is unstable under light and easy to decompose. In view of the defects of the above two photocatalytic materials, the key to the...

Claims

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Application Information

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IPC IPC(8): B01J27/186C02F1/30
Inventor 王丹军郭莉付峰岳林林张洁申会东
Owner YANAN UNIV
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