BiOBr/Bi2WO6 composite photocatalyst with heterostructure and preparation method thereof

A technology of heterostructures and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy recombination of photogenerated carriers and low photocatalytic efficiency, and achieve extended visible light transmission. Path, low preparation cost, favorable for efficient generation and delayed recombination effect

Inactive Publication Date: 2015-11-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when these two kinds of bismuth oxylates are used alone, the problems of easy recombination of photogenerated carriers and low photocatalytic efficiency exist to varying degrees.

Method used

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  • BiOBr/Bi2WO6 composite photocatalyst with heterostructure and preparation method thereof
  • BiOBr/Bi2WO6 composite photocatalyst with heterostructure and preparation method thereof

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preparation example Construction

[0022] Its preparation method comprises the following steps:

[0023] 1. Preparation of the premixed system: at room temperature, 1.0-3.0 mmol of Bi(NO 3 ) 3 ·5H 2 Add O into 20-50mL of dilute nitric acid solution, stir to dissolve it completely, and obtain a colorless and transparent bismuth nitrate solution A; - and tungstate WO 4 2- The molar ratio is 1 : (1-1.5) ratio, respectively weigh soluble bromide and tungstate, dissolve in 50-100mL water successively, stir, and obtain the - and WO 4 2- The mixed solution, and then add surfactant and fatty alcohol, so that the concentration of the two in the solution reaches 0.01-0.1mol L -1 , after stirring evenly, the mixed solution B is obtained; at room temperature, through strong magnetic stirring, the mixed solution B is slowly added dropwise to the A solution to obtain a suspension premixed system C containing light yellow insoluble matter, which is allowed to stand for 0.5 -2.0 hours;

[0024]2. Preparation of compo...

Embodiment 1

[0031] At room temperature, weigh 1.0mmolBi(NO 3 ) 3 ·5H 2 O dissolved in 20mL has a molar concentration of 1.0mol L -1 HNO 3 solution, stirred to obtain a colorless and transparent A solution; respectively take 1.0mmolNaBr and 1.0mmolNa 2 WO 4 2H 2 O, dissolved in 50mL of water successively, after stirring constantly, then add sodium lauryl sulfate and 0.5mmol of butanol respectively, to obtain mixed solution B. Under strong magnetic stirring, slowly drop the mixed solution B into the solution A to obtain a suspension C containing a light yellow precipitate, and let it stand for 0.5h; ultrasonically treat the suspension C for 30min, and transfer it to a 50mL polytetrafluoroethylene-lined In the water heating kettle, use 1.0mol·L -1 HNO 3 or 0.5mol·L -1 Adjust the pH value of the reaction system in the kettle to 3 with NaOH, so that the filling degree in the kettle is 60%, seal the kettle, and place it in a thermostat at 140°C for 15 hours; after the reaction, centrif...

Embodiment 2

[0033] At room temperature, weigh 3.0mmolBi(NO 3 ) 3 ·5H 2 O dissolved in 50mL has a molar concentration of 5.0mol L -1 HNO 3 solution, after fully stirring, a colorless and transparent solution of A was obtained; respectively take 1.0mmol NH 4 Br and 1.5mmol (NH 4 ) 6 W 7 o 24 ·6H 2 O, dissolved in 100mL of water successively, under continuous stirring, then add 10.0mmol each of alkylphenol polyoxyethylene ether and ethylene glycol respectively to obtain mixed solution B. Under strong magnetic stirring, slowly add the mixed liquid B to the A solution dropwise to obtain a suspension C containing a light yellow precipitate, and let it stand for 2.0h; ultrasonically treat the suspension C for 30min, and transfer it to a 50mL liner lined with polytetrafluoroethylene In the hydrothermal kettle, use 5.0mol·L -1 HNO 3 or 3.0mol·L -1 Adjust the pH value of the reaction system in the kettle to 9 with NaOH, so that the filling degree in the kettle is 80%, seal the kettle, a...

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Abstract

Provided are a BiOBr/Bi2WO6 composite photocatalyst with a heterostructure and a preparation method thereof. The photocatalyst is formed by a P-type semiconductor BiOBr and an N-type semiconductor Bi2WO6 which have similar crystal structures and similar forbidden bandwidths in a composite mode, the molar ratio of the BiOBr to the Bi2WO6 is 1 to 1-1.5, a P-N heterojunction interface is formed between two crystal phases, the photocatalyst is nest-shaped and porous in appearance with micro-nano scales, and the average specific surface area is 110 m<2>.g<-1>. A one-step in-situ hydrothermal reaction process control technology is adopted, a P-N knot type composite semiconductor catalyst evenly mixed at the micro-nano scale level can be obtained only through a one-step reaction, the process is simpler and easy to control, the preparation time is shorter, and therefore the preparation cost is lower.

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials and their preparation, in particular to a bismuth-based BiOBr / Bi with heterostructure 2 WO 6 Composite photocatalyst and preparation method thereof. Background technique [0002] With the rapid development of photocatalytic theory, the application of photocatalytic oxidation (PCO) to pollution systems, especially the degradation treatment of organic pollutants, is receiving increasing attention from science and technology and industry. PCO technology can degrade a variety of substances at the same time, with high treatment efficiency, no secondary pollution, small investment, mild reaction conditions, low operating costs, and has incomparable advantages over other advanced oxidation technologies (AOPs). The key factor in the development and application of PCO technology depends on efficient photocatalysts that can fully absorb sunlight, and increasing the generation rate o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J35/10
Inventor 张军张豪朱一明李华博姚海瑞米刚宋帮才
Owner HENAN UNIV OF SCI & TECH
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