Ternary compound optical catalyst and preparation method therefor and application thereof

A photocatalyst and ternary composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low effective absorption efficiency, low photocatalytic activity, short photocatalytic life, etc. , to achieve enhanced photocatalytic performance, simple operation method, and simple synthesis process

Inactive Publication Date: 2015-12-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 Photocatalyst is a wide bandgap semiconductor material, which has low effective absorption efficiency of light and easy recombination of electrons and holes, so TiO 2 Short photocatalytic life and low photocatalytic activity

Method used

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  • Ternary compound optical catalyst and preparation method therefor and application thereof
  • Ternary compound optical catalyst and preparation method therefor and application thereof
  • Ternary compound optical catalyst and preparation method therefor and application thereof

Examples

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Embodiment 1

[0027] The present embodiment provides a kind of preparation method of titanium dioxide graphene-cadmium sulfide ternary composite photocatalyst, it comprises the following steps:

[0028] 1) Use the improved Hummers method to obtain neutral graphite oxide through dialysis and drying, then dissolve 1 mg of graphite oxide in 80 ml of dimethyl sulfoxide (DMSO) solution, and obtain a clear graphene oxide solution through ultrasonic dispersion;

[0029] 2) Add 17.6ml of isopropyl titanate (95%) dropwise into absolute ethanol and keep stirring, then add dropwise 3.2ml of 0.1M potassium chloride aqueous solution, stir the mixed solution at room temperature for 15 minutes, and then let it stand Aging for 18 hours, filtering the reaction solution, then repeatedly washing with ethanol, and drying to obtain titanium dioxide precursor nanospheres;

[0030] 3) taking step 2) and dissolving all the titanium dioxide precursor nanospheres obtained by the reaction in step 1) in the graphene o...

Embodiment 2

[0039] This example is roughly the same as Example 1, except that the mass of chromium acetate in step 4) is 96 mg, that is, the mass ratio of chromium acetate to titanium dioxide precursor is 1:1, and its structural properties and photolysis water hydrogen production efficiency Similar to Example 1.

Embodiment 3

[0041] This embodiment is roughly the same as Example 1, except that the quality of chromium acetate in step 4) is 288 mg, that is, the mass ratio of chromium acetate and titanium dioxide precursor is 3:1, and its product structure is the same as that of Example 1, 2 The difference is that the cadmium sulfide layer on the surface of titanium dioxide is thicker, and there are a small amount of scattered cadmium sulfide particles that are not attached to titanium dioxide. Its photocatalytic performance is similar to Example 1. It shows that although the amount of cadmium sulfide in the product has increased, since the excess cadmium sulfide particles are not combined with titanium dioxide and graphene, the hydrogen production efficiency of this part is extremely low, so the overall hydrogen production efficiency has not been significantly improved.

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Abstract

The invention provides a preparation method for a titanium dioxide@graphene-cadmium sulfide ternary compound optical catalyst. The preparation method comprises: synthesizing titanium dioxide@graphene-cadmium sulfide in situ by virtue of a hydrothermal method including firstly inducing graphene to wrap titanium dioxide microspheres; and meanwhile, loading cadmium sulfide quantum dots on graphene nanosheets to form a ternary compound structure. Titanium dioxide and graphene are together used as an electron acceptor and a transfer of cadmium sulfide, so that the electron-hole separation time of cadmium sulfide is prolonged, and the purpose of enhancing the optical catalytic performance of the material is achieved. The method provided by the invention is simple to operate, short in synthetic period and easy to control. No additional noble metals are added as a co-catalyst, and the hydrogen production rate of the material can reach 715 [mu]mol / g / h. The optical catalyst prepared by the method provided by the invention can be repeatedly used.

Description

technical field [0001] The invention relates to a preparation method of a ternary inorganic nanocomposite material, in particular to a titanium dioxide graphene-cadmium sulfide ternary composite photocatalyst, a preparation method and application thereof. Background technique [0002] In recent years, the photolysis of water to produce hydrogen by inorganic semiconductor materials under visible light conditions has attracted widespread attention at home and abroad. For example, in the past few decades, titanium dioxide (TiO 2 ) has been studied as a typical semiconductor photocatalyst due to its low cost, non-toxicity, and high chemical stability. But TiO 2 Photocatalyst is a wide bandgap semiconductor material, which has low effective absorption efficiency of light and easy recombination of electrons and holes, so TiO 2 The photocatalytic life is short and the photocatalytic activity is not high. Contents of the invention [0003] The object of the present invention i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04
CPCY02E60/36
Inventor 阳晓宇卢毅程秀孙嘉男刘培苏宝莲
Owner WUHAN UNIV OF TECH
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