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Preparation method and application of lead tungstate/cadmium sulfide composite visible-light-driven photocatalyst

A technology of cadmium sulfide and lead tungstate, which is applied in the field of preparation of lead tungstate/cadmium sulfide composite visible light catalyst, can solve the problems of reduced photocatalytic performance, easy recombination of electrons and holes, etc., and achieves low cost and high charge separation efficiency. , the preparation method is simple

Inactive Publication Date: 2019-11-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing photocatalysts of metal tungstates have the disadvantage that electrons and holes generated by light induction are easy to recombine, and have certain photocorrosion, which reduces their photocatalytic performance.

Method used

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  • Preparation method and application of lead tungstate/cadmium sulfide composite visible-light-driven photocatalyst
  • Preparation method and application of lead tungstate/cadmium sulfide composite visible-light-driven photocatalyst
  • Preparation method and application of lead tungstate/cadmium sulfide composite visible-light-driven photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 4.66g of cadmium nitrate and 3.45g of thiourea to 70ml of ethylenediamine at the same time, stir ultrasonically for 30min, then put the mixture into a 100ml reactor, and conduct a hydrothermal reaction at 160°C for 24h. Cool naturally at room temperature, wash the precipitate three times alternately with deionized water and ethanol, and obtain an orange cadmium sulfide sample.

[0028] (2) Add 0.189g of lead acetate and 0.165g of sodium tungstate into 100ml of deionized water, and stir magnetically for 2 hours to obtain a uniform suspension. Then, the obtained suspension was transferred into a 100ml reactor, and subjected to hydrothermal reaction at 180°C for 24h. Finally, the obtained product was centrifuged and washed 3 times with deionized water and ethanol, and dried at 100 °C for 2 hours to obtain a lead tungstate sample.

[0029] (3) Preparation of lead tungstate / cadmium sulfide composite photocatalyst: ultrasonicate lead tungstate and cadmium sulfide in ...

Embodiment 2

[0031] (1) Preparation of cadmium sulfide: Add 4.66g of cadmium nitrate and 3.45g of thiourea to 70ml of ethylenediamine at the same time, stir ultrasonically for 50min, then put the mixture into a 100ml reactor, and conduct a hydrothermal reaction at 170°C for 30h. Cool naturally at room temperature, wash the precipitate five times alternately with deionized water and ethanol to obtain an orange sample, and collect a powder sample.

[0032] (2) Preparation of lead tungstate: Add 0.189g of lead acetate and 0.165g of sodium tungstate into 100ml of deionized water, and stir magnetically for 2 hours to obtain a uniform suspension. Then, the obtained suspension was transferred into a 100ml reactor, and subjected to hydrothermal reaction at 180°C for 24h. Finally, the resulting product was centrifuged and washed 5 times with deionized water and ethanol, and dried at 100 °C for 2 h.

[0033] (3) Preparation of lead tungstate / cadmium sulfide composite photocatalyst: ultrasonicate le...

Embodiment 3

[0036] (1) Preparation of cadmium sulfide: Add 4.66g of cadmium nitrate and 3.45g of thiourea to 70ml of ethylenediamine at the same time, stir ultrasonically for 50min, then put the mixture into a 100ml reactor, and conduct a hydrothermal reaction at 170°C for 30h. Cool naturally at room temperature, wash the precipitate five times alternately with deionized water and ethanol to obtain an orange sample, and collect a powder sample.

[0037] (2) Preparation of lead tungstate: Add 0.189g of lead acetate and 0.165g of sodium tungstate into 100ml of deionized water, and stir magnetically for 2 hours to obtain a uniform suspension. Then, the obtained suspension was transferred into a 100ml reactor, and subjected to hydrothermal reaction at 170°C for 30h. Finally, the resulting product was centrifuged and washed 5 times with deionized water and ethanol, and dried at 100 °C for 2 h.

[0038] (3) Preparation of lead tungstate / cadmium sulfide composite photocatalyst: ultrasonicate le...

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Abstract

The invention specifically relates to a preparation method and application of a lead tungstate / cadmium sulfide composite visible-light-driven photocatalyst, belonging to the technical field of semiconductor photocatalysis nano-materials. The preparation method comprises the following steps: adding cadmium nitrate and thiourea into ethylenediamine to obtain a mixed solution, carrying out stirring,then transferring the mixed solution to a hydrothermal reaction kettle, and carrying out a hydrothermal reaction to obtain cadmium sulfide; adding lead acetate and sodium tungstate into deionized water, carrying out stirring, then transferring an obtained suspension to the reaction kettle, and carrying out a hydrothermal reaction to obtain lead tungstate; after separate ultrasonic treatment of lead tungstate and cadmium sulfide in ethanol, dropwise adding the suspension of lead tungstate into the suspension of cadmium sulfide, performing ultrasonic treatment, adding acetone, and then performing stirring and drying to obtain the lead tungstate / cadmium sulfide composite visible-light-driven photocatalyst. The prepared composite photocatalyst is greatly improved in activity and efficiency, and has stronger adsorption capacity in a visible light region and higher charge separation efficiency. The preparation method is simple in process, low in cost and easy in manufacturing process, and has potential application value.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic nanomaterials, in particular to a preparation method and application of a lead tungstate / cadmium sulfide composite visible light catalyst. Background technique [0002] Photocatalysis is an environmentally friendly technology that has important application prospects in environmental purification and conversion of solar energy into chemical energy. Under appropriate light, most persistent organic pollutants in wastewater can be rapidly degraded by proper photocatalysis. The main advantage of this method is that it is relatively simple and can avoid secondary pollution. [0003] In recent years, CdS has the advantages of simple preparation method, response to visible light, and energy band structure that meets the requirements of photolysis of water, and is considered to be a promising visible light catalyst. However, the photocatalytic performance of a single CdS is often not...

Claims

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Application Information

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IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCB01J27/04B01J23/002C02F1/30C02F2101/308C02F2305/10B01J35/39
Inventor 王安慰万玉山翟娟韩慧
Owner CHANGZHOU UNIV
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