Cadmium sulfide/nickel tungstate composite visible light catalyst, preparation method and application

A technology of nickel tungstate and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photocatalytic activity and high electron-hole recombination rate of pure nickel tungstate , to achieve the effects of excellent photocatalytic activity, good stability and simple preparation method

Active Publication Date: 2020-11-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a member of the tungstate family, nickel tungstate (NiWO 4 ) has a narrow band gap energy (2.6eV), and has a certain ability to oxidize and decompose various organic substances, so it is considered to have a promising photocatalyst, but due to its high electron-hole recombination rate, the photocatalytic activity of pure nickel tungstate still low

Method used

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  • Cadmium sulfide/nickel tungstate composite visible light catalyst, preparation method and application
  • Cadmium sulfide/nickel tungstate composite visible light catalyst, preparation method and application
  • Cadmium sulfide/nickel tungstate composite visible light catalyst, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Preparation of nickel tungstate: add 0.33g of nickel nitrate and 0.291g of sodium tungstate into 30ml of deionized water respectively, and stir magnetically for 2 hours to obtain a homogeneous solution. Then the sodium tungstate solution was added dropwise to the nickel nitrate solution, and the stirring was continued for 2 hours. Then, the obtained mixed solution was transferred to a 100ml reactor, and reacted hydrothermally at 180°C for 16 hours. The obtained product was centrifuged and washed 3 times with deionized water and ethanol, and dried at 100°C for 2 hours, and finally the dried powder was calcined in a muffle furnace at 700°C for 4 hours to obtain a light yellow powdery nickel tungstate sample .

[0026] (2) Preparation of cadmium sulfide / nickel tungstate composite photocatalyst: Weigh 0.1g nickel tungstate and add it to 70ml ethylene glycol, stir magnetically for 1h, then add 0.018432g cadmium acetate, continue ultrasonication for 1h, then add 0.0052g s...

Embodiment 2

[0028] (1) Preparation of nickel tungstate: add 0.33g of nickel nitrate and 0.291g of sodium tungstate into 30ml of deionized water respectively, and stir magnetically for 2 hours to obtain a homogeneous solution. Then the sodium tungstate solution was added dropwise to the nickel nitrate solution, and the stirring was continued for 2 hours. Then, the obtained mixed solution was transferred to a 100ml reactor, and reacted hydrothermally at 180°C for 16 hours. The obtained product was centrifuged and washed 3 times with deionized water and ethanol, and dried at 100°C for 2 hours, and finally the dried powder was calcined in a muffle furnace at 700°C for 4 hours to obtain a light yellow powdery nickel tungstate sample .

[0029] (2) Preparation of cadmium sulfide / nickel tungstate composite photocatalyst: Weigh 0.1g nickel tungstate and add it to 70ml ethylene glycol, stir magnetically for 1h, then add 0.036864g cadmium acetate, continue ultrasonication for 1h, then add 0.0104g s...

Embodiment 3

[0031] (1) Preparation of nickel tungstate: add 0.33g of nickel nitrate and 0.291g of sodium tungstate into 30ml of deionized water respectively, and stir magnetically for 2 hours to obtain a homogeneous solution. Then the sodium tungstate solution was added dropwise to the nickel nitrate solution, and the stirring was continued for 2 hours. Then, the obtained mixed solution was transferred to a 100ml reactor, and reacted hydrothermally at 180°C for 16 hours. The obtained product was centrifuged and washed 3 times with deionized water and ethanol, and dried at 100°C for 2 hours, and finally the dried powder was calcined in a muffle furnace at 700°C for 4 hours to obtain a light yellow powdery nickel tungstate sample .

[0032] (2) Preparation of cadmium sulfide / nickel tungstate composite photocatalyst: Weigh 0.1g nickel tungstate and add it to 70ml ethylene glycol, stir magnetically for 1h, then add 0.055296g cadmium acetate, continue ultrasonication for 1h, then add 0.0156g s...

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Abstract

The invention discloses a cadmium sulfide / nickel tungstate composite visible light catalyst, a preparation method and application, and belongs to the technical field of semiconductor photocatalytic nano materials. The invention provides the preparation method of the cadmium sulfide / nickel tungstate composite visible light catalyst. By constructing a NiWO4 and CdS heterostructure, the method retains the redox ability of the material, inhibits the recombination of photogenerated carriers and effectively enhances the photocatalytic activity of the composite material, so that the composite material exhibits superior photocatalytic activity under visible light irradiation.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic nanomaterials, and in particular relates to the preparation and application of a cadmium sulfide / nickel tungstate composite visible light catalyst. Background technique [0002] Photocatalytic technology has great application prospects to alleviate energy depletion and ecological environment damage by producing renewable fuels, degrading and mineralizing toxic pollutants. On the one hand, the use of semiconductor photocatalytic materials can convert low-density solar energy into high-density chemical energy (photocatalytic water splitting to produce hydrogen) or electrical energy (dye-sensitized solar cells); Redox activity of electrons and holes for treatment of industrial wastewater and organic pollutants. [0003] Cadmium sulfide (CdS) is a typical direct-bandgap narrow-bandgap semiconductor material in the II-VI group. The bandgap width of bulk CdS is 2.42eV at room tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/049C02F1/30C02F101/30C02F101/38
CPCB01J35/004B01J27/049C02F1/30C02F2101/308C02F2101/38C02F2305/10
Inventor 王安慰万玉山
Owner CHANGZHOU UNIV
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