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A kind of copper/bismuth tungstate composite photocatalytic material and preparation method thereof

A composite photocatalysis, bismuth tungstate technology, applied in the direction of light water/sewage treatment, etc., can solve the problems of low visible light catalytic activity, large specific surface area, wide visible light response range, etc., achieving good controllability and large specific surface area. , the effect of a wide range of visible light response

Active Publication Date: 2017-03-22
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a copper / bismuth tungstate composite photocatalytic material, which has a large specific surface area and a wide visible light response range, and solves the problem that the visible light catalytic activity of bismuth tungstate is not high.

Method used

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  • A kind of copper/bismuth tungstate composite photocatalytic material and preparation method thereof
  • A kind of copper/bismuth tungstate composite photocatalytic material and preparation method thereof
  • A kind of copper/bismuth tungstate composite photocatalytic material and preparation method thereof

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preparation example Construction

[0034] The preparation method of the above-mentioned copper / bismuth tungstate composite photocatalytic material is specifically implemented according to the following steps:

[0035] Step 1, prepare bismuth tungstate

[0036] Bi(NO 3 ) 3 ·5H 2 O dissolved in HNO 3 Solution (HNO 3 The concentration of the solution is 0.6mol / L, Bi(NO 3 ) 3 ·5H 2 O and HNO 3 The volume ratio of the substance of the solution is 1:10mol / L) and then added dropwise (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution ((NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution concentration is 0.02mol / L, (NH 4 ) 10 W 12 o 41 ·5H 2 The volume ratio of O aqueous solution to nitric acid solution is 1:2), continue to stir for 2h, then transfer it into a stainless steel reaction kettle lined with Teflon (Teflon), seal it and put it in an electric constant temperature blast drying oven at 140 React at -200°C for 2-12h (preferably react at 190°C for 4h), after the reaction is completed, naturally cool to ...

Embodiment 1

[0041] (1) Preparation of bismuth tungstate

[0042] 2mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 20 mL of HNO with a concentration of 0.6 mol / L 3 solution, stirred at room temperature until solid Bi(NO 3 ) 3 ·5H 2 O dissolved, and then dropwise added 10mL concentration of 0.02mol / L (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution, continue to stir for 2 hours, and then transfer the mixed solution into a stainless steel reaction kettle lined with Teflon, seal it, put it in an electric heating constant temperature blast drying oven, and react for 4 hours at 190 ° C, after the reaction is completed, naturally cool to room temperature, Centrifuge, wash, and vacuum dry at 80°C for 2 hours to obtain Bi 2 WO 6 ;

[0043] (2) Preparation of copper / bismuth tungstate composite photocatalytic material

[0044] Disperse 1mmol of bismuth tungstate powder in 20mL of deionized water, then add 10mL of CuSO with a concentration of 5.0mmol / L dropwise 4 After the aqueous solution was stir...

Embodiment 2

[0046] (1) Preparation of bismuth tungstate

[0047] 2mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 20 mL of HNO with a concentration of 0.6 mol / L 3 solution, stirred at room temperature until solid Bi(NO 3 ) 3 ·5H 2 O dissolved, and then dropwise added 10mL concentration of 0.02mol / L (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution, continue to stir for 2 hours, and then transfer the mixed solution into a stainless steel reaction kettle lined with Teflon, seal it, put it in an electric heating constant temperature blast drying oven, and react for 4 hours at 190 ° C, after the reaction is completed, naturally cool to room temperature, Centrifuge, wash, and vacuum dry at 80°C for 2 hours to obtain Bi 2 WO 6 ;

[0048] (2) Preparation of copper / bismuth tungstate composite photocatalytic material

[0049] Disperse 1mmol of bismuth tungstate powder in 20mL of deionized water, then add 2mL of CuSO with a concentration of 5.0mmol / L dropwise 4 After the aqueous solution was stirr...

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Abstract

The invention discloses a copper / bismuth tungstate composite photocatalytic material. Nanometer copper is deposited on a bismuth tungstate photocatalyst, wherein the molar weight of the nanometer copper is 4-8% of that of the bismuth tungstate photocatalyst. The invention further discloses a preparation method for the copper / bismuth tungstate composite photocatalytic material. The preparation method comprises the following steps: dispersing bismuth tungstate in deionized water, dropwise adding a CuSO4 aqueous solution, and then dropwise adding an ascorbic acid aqueous solution; transferring the obtained suspending liquid into a stainless steel reaction kettle with a Teflon inner lining for reaction, naturally cooling a reactant to a room temperature, and performing centrifugal filtration, washing and vacuum drying so as to obtain the copper / bismuth tungstate composite photocatalytic material. The copper / bismuth tungstate composite photocatalytic material provided by the invention does not have agglomeration, the specific surface area is large, the response range of visible light is wide, compared with the bismuth tungstate, the catalytic activity of the copper / bismuth tungstate composite photocatalytic material is obviously improved, the repeated use property is good, the preparation technology is simple, the conditions are mild, the controllability is good, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis, and specifically relates to a copper / bismuth tungstate composite photocatalytic material, and also relates to a preparation method of the composite photocatalytic material. Background technique [0002] Bi 2 WO 6 It is the simplest Aurivillius-type oxide, and its Bi 6s Orbit and O 2p Orbital hybridization forms a valence band, W 5d The track forms a conduction band, and its forbidden band width is narrow (about 2.7eV), which can absorb part of visible light and be excited. Therefore, Bi 2 WO 6 The research and development of photocatalytic materials will provide new ideas for improving the utilization rate of sunlight, which has potential application value in the fields of environmental purification and new energy development, and has become one of the widely researched photocatalysts. However, Bi 2 WO 6 The visible light response range is narrow, and photogenerated electron-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888C02F1/30
Inventor 王丹军郭莉薛岗林付峰
Owner YANAN UNIV