a tio 2 /cds/graphene composite photocatalytic material and preparation method thereof

A photocatalytic material and graphene composite technology, which is applied in the field of TiO2/CdS/graphene composite photocatalytic material and its preparation, can solve the problem of low photocatalytic efficiency of photocatalysts, improve the response of ultraviolet light, and increase the contact surface , Improve the effect of photocatalytic performance

Inactive Publication Date: 2017-06-23
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a kind of TiO 2 / CdS / graphene composite photocatalyst material and preparation method thereof, said a kind of TiO 2 / CdS / graphene composite photocatalytic material and its preparation method solve the problem of TiO in the prior art 2 Technical problems of low photocatalytic efficiency of photocatalysts

Method used

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  • a tio <sub>2</sub> /cds/graphene composite photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> /cds/graphene composite photocatalytic material and preparation method thereof
  • a tio <sub>2</sub> /cds/graphene composite photocatalytic material and preparation method thereof

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Embodiment 1

[0029] 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 100:5.

[0030] One of the above TiO2 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...

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, the TiO obtained in step (2) of Example 1 2 / CdS composite, the TiO finally made in embodiment 1 2 / CdS / graphene composite photocatalytic material is used for the degradation of methylene blue, the steps are as follows:

[0058] Take 3 copies with a concentration of 1.0×10 -4 mol / L aqueous solution of methylene blue, respectively add 30 mg of the CdS yellow powder obtained in the step (1) of Example 1 and the TiO obtained in the step (2) of Example 1 2 / CdS composite, the TiO finally made in embodiment 1 2 / CdS / graphene composite photocatalytic material, the adsorption and desorption equilibrium was performed under dark reaction for 1h, and then irradiated under a 500w xenon lamp, and after photolysis for 20min, the degradation rate of methylene blue was measured. 17.4%, TiO 2 / CdS coating catalyzed the reaction, the degradation rate of methylene blue was 79.12%, while TiO 2 / CdS / graphene composite photocatal...

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Abstract

A kind of TiO of the present invention 2 /CdS/graphene composite photocatalytic material, calculated by mass ratio, with TiO 2 /CdS: Graphene oxide compounded at a ratio of 100:1~5. The present invention also provides the above-mentioned TiO 2 /CdS/graphene composite photocatalytic material preparation method, first prepare TiO 2 /CdS composite yellow powder, and then prepared graphene oxide dispersion, and finally TiO 2 /CdS complex is added to the graphene oxide dispersion, hydrothermally reacted, the resulting reaction solution is centrifuged, washed, and dried to obtain TiO 2 /CdS/graphene composite photocatalytic materials. TiO of the present invention 2 /CdS composite, which can significantly improve the utilization efficiency of catalytic materials for visible light, and improve the traditional TiO 2 The disadvantage of only responding to ultraviolet light, while using TiO 2 Coating CdS can also greatly reduce the photocorrosion problem of CdS and improve the stability of catalytic materials.

Description

[0001] Technical field: [0002] 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. [0003] technical background: [0004] 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(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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