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TiO2/CdS/graphene composite photocatalytic material and preparation method therefor

A technology of graphene composite and photocatalytic materials, which is applied in the field of TiO2/CdS/graphene composite photocatalytic materials and its preparation, to achieve the effects of convenient operation, reducing photocorrosion problems and preventing photocorrosion

Inactive Publication Date: 2016-01-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a kind of TiO2 / CdS / graphene composite photocatalytic Materials and preparation methods thereof, the described TiO2 / CdS / graphene composite photocatalytic material and preparation methods thereof solve the problem of TiO2Technical problems of low photocatalytic efficiency of photocatalysts

Method used

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  • TiO2/CdS/graphene composite photocatalytic material and preparation method therefor
  • TiO2/CdS/graphene composite photocatalytic material and preparation method therefor
  • TiO2/CdS/graphene composite photocatalytic material and preparation method therefor

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Embodiment 1

[0029] a TiO 2 / CdS / graphene composite photocatalytic material, made of TiO 2 / CdS composite and graphene oxide composite, calculated by mass ratio, namely TiO 2 / CdS:graphene oxide is 100:5.

[0030] One of the above TiO 2 The preparation method of / CdS / graphene composite photocatalytic material specifically comprises the following steps:

[0031] (1) CdCl 2 2.5H 2 O, Na 2 S·9H 2 Dissolve O in deionized water, and after uniform dispersion, slowly add the sodium sulfide solution to the cadmium chloride solution, react for 2 hours under magnetic stirring, transfer to a 50ml polytetrafluoroethylene-lined stainless steel hydrothermal reactor, and react at 150°C for 12 hours , and then washed three times with deionized water and absolute ethanol and dried at 80 °C to obtain CdS yellow powder.

[0032] CdCl used above 2 2.5H 2 O, Na 2 S·9H 2 Amount of O and water, as CdCl 2 2.5H 2 O:Na 2 S·9H 2 O:H 2 O is the ratio calculation of 2.28g:2.40g:20ml;

[0033] (2) Disso...

Embodiment 2

[0043] A kind of TiO 2 / CdS / graphene composite photocatalytic material, made of TiO 2 / CdS composite and graphene oxide composite, calculated by mass ratio, that is, TiO 2 / CdS: graphene oxide is 100:3.

[0044] One of the above TiO 2 The preparation method of / CdS / graphene composite photocatalytic material specifically comprises the following steps:

[0045] (1) CdCl 2 2.5H 2 O, Na 2 S·9H 2 O was respectively dissolved in deionized water, and after uniform dispersion, the sodium sulfide solution was slowly added dropwise to the cadmium chloride solution, reacted for 1.5 hours under magnetic stirring, and transferred to a 50ml polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle for reaction at 150°C 8h, and then washed three times with deionized water and absolute ethanol successively, and then dried at 80°C to obtain a yellow powder of CdS.

[0046] CdCl used above 2 2.5H 2 O, Na 2 S·9H 2 Amount of O and water, as CdCl 2 2.5H 2 O:Na 2 S·9...

Embodiment 3

[0057] The CdS yellow powder obtained in step (1) of Example 1 and the TiO obtained in step (2) of Example 1 were 2 / CdS composite, TiO finally obtained in Example 1 2 The / CdS / graphene composite photocatalytic material is used for the degradation of methylene blue, and the steps are as follows:

[0058] Take 3 copies with a concentration of 1.0×10 -4 mol / L aqueous solution of methylene blue, add 30 mg of CdS yellow powder obtained in step (1) of Example 1 and TiO obtained in step (2) of Example 1 respectively 2 / CdS composite, TiO finally obtained in Example 1 2 The / CdS / graphene composite photocatalytic material was subjected to adsorption and desorption equilibrium under the dark reaction for 1 h, and then irradiated under a 500w xenon lamp for 20 min. After photolysis, the degradation rate of methylene blue was measured. As a result, the degradation rate of methylene blue was catalyzed by CdS. 17.4%, TiO 2 / CdS coating catalyzed the reaction, the degradation rate of me...

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Abstract

The invention relates to a TiO2 / CdS / graphene composite photocatalytic material which is prepared by compounding TiO2 / CdS and oxidized graphene in a mass ratio of 100 to (1-5). The invention further provides a preparation method for the TiO2 / CdS / graphene composite photocatalytic material. The preparation method comprises the steps of: firstly preparing TiO2 / CdS compound yellow powder; then preparing an oxidized graphene dispersion liquid; and finally, adding the prepared Ti2O / CdS compound into the oxidized graphene dispersion liquid, carrying out hydrothermal reaction to obtain a reaction liquid, and centrifugalizing, washing and drying the reaction liquid to obtain the TiO2 / CdS / graphene composite photocatalytic material. The TiO2 / CdS compound provided by the invention can be used for remarkably improving the utilization efficiency of a catalytic material on visible light, so that the defect that conventional TiO2 is just responsive to ultraviolet is avoided, and meanwhile, by wrapping CdS by using TiO2, the photo-corrosion problem of CdS can be further reduced to a great extent, and the stability of the catalytic material is improved.

Description

Technical field: [0001] The invention belongs to the field of nano photocatalytic materials, and relates to a graphene composite photocatalytic material, specifically a TiO 2 / CdS / graphene composite photocatalytic material and its preparation method. technical background: [0002] Photocatalytic technology has the advantages of energy saving and environmental protection, green and pollution-free, mild reaction conditions, simple and easy-to-control process, low energy consumption, and thorough degradation of pollutants. It has good development prospects in the fields of water pollutant treatment and new energy. TiO 2 As a photocatalytic material, it has been favored by scientific researchers for a series of advantages such as stable chemical properties, corrosion resistance, non-toxicity, high activity and dispersibility, abundant reserves, low cost and easy availability. But due to TiO 2 The band gap (3.2ev) is wide, and it can only absorb light radiation in the ultrav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30
CPCY02W10/37
Inventor 王磊王文雅李书珍
Owner SHANGHAI INST OF TECH
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