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Preparation method of three-dimensional echinoid ZnS/CdS composite semiconductor photocatalytic nano material

A composite semiconductor and nanomaterial technology is applied in the field of preparation of three-dimensional sea urchin-like ZnS/CdS composite semiconductor photocatalytic nanomaterials, which can solve the problems of low photocatalytic efficiency of ZnS, and achieve good application prospects, high catalytic activity and low cost. Effect

Inactive Publication Date: 2013-05-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide the preparation method of three-dimensional sea urchin shape ZnS / CdS composite semiconductor photocatalytic nano material, combine the advantages of ZnS and CdS, adopt solvothermal and uniform precipitation method to prepare three-dimensional ZnS / CdS CdS sea urchin-like nanocomposite catalyst to address the low photocatalytic efficiency of ZnS

Method used

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  • Preparation method of three-dimensional echinoid ZnS/CdS composite semiconductor photocatalytic nano material
  • Preparation method of three-dimensional echinoid ZnS/CdS composite semiconductor photocatalytic nano material
  • Preparation method of three-dimensional echinoid ZnS/CdS composite semiconductor photocatalytic nano material

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Embodiment 1

[0022] A method for preparing a three-dimensional sea urchin-shaped ZnS / CdS composite semiconductor photocatalytic nanomaterial, comprising the following steps:

[0023] 1) Preparation of sea urchin-like ZnS with uniform scale

[0024] Weigh 0.219gZn(CH 3 COO) 2 2H 2 O, dissolved in a 20mL polytetrafluoroethylene reactor filled with 12mL distilled water under magnetic stirring, then add 5mL of ethylenediamine, add 0.2mL carbon disulfide after stirring for 2-3min, and then add 0.5mmol after stirring the system evenly Cetyltrimethylammonium bromide, continue to stir until the cetyltrimethylammonium bromide is completely dissolved; put the above polytetrafluoroethylene reactor into a stainless steel reactor jacket, tighten the lid of the kettle, and store at 170°C After the reaction, the reaction system was naturally cooled to room temperature, centrifuged to obtain a white precipitate product, washed with ethanol and distilled water for 3 times, and then dried in a vacuum ove...

Embodiment 2

[0029] Change the carbon disulfide in step 1) in Example 1 to add 1.5 mmol thiourea, and the other schemes are the same.

[0030] The obtained composite material was tested, and the results showed that the composite catalyst was selective for dyes, and only showed excellent photocatalytic activity for methyl orange, and the degradation rate reached 65%.

Embodiment 3

[0032] The surfactant in step 1) in Example 1 is changed to polyvinylpyrrolidone, and the other schemes are the same.

[0033]The dispersibility of the obtained sample was slightly inferior to that of Example 1, and the photocatalytic degradation rate of four organic dyes reached: 75% for methyl orange, 79.4% for rhodamine B, 82% for methylene blue, and 60.2% for pyrrored B.

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Abstract

The invention relates to a preparation method of a three-dimensional echinoid ZnS / CdS composite semiconductor photocatalytic nano material, which comprises the following steps: preparing uniform-size echinoid ZnS, and carrying out functional assembly on CdS nanoparticles; and by combining the advantages of ZnS and CdS, preparing the three-dimensional ZnS / CdS echinoid nano composite catalyst by a solvothermal and homogeneous precipitation process. The invention aims to solve the problem of low efficiency in the ZnS photocatalysis. The ZnS / CdS composite semiconductor photocatalytic nano material provided by the invention has a unique three-dimensional echinoid structure, and is composed of hexagonal crystal echinoid ZnS and hexagonal structure CdS nanoparticles. The invention has the advantages of high catalytic activity, low cost, accessible raw materials, simple preparation technique and favorable repetitiveness, and has favorable application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a preparation method of a three-dimensional sea urchin-like ZnS / CdS composite semiconductor photocatalytic nanometer material. Background technique [0002] In recent years, people have done a lot of research on the photocatalytic oxidation reaction of nanometer-sized semiconductor materials. The reaction efficiency is low. As a typical optoelectronic semiconductor material, nano-ZnS is an important wide-bandgap semiconductor material (Eg=3.77eV). In the past few decades, ZnS has been widely used in photocatalysis, photoluminescence, Photoelectric conversion, nonlinear optics, etc. However, as a photocatalyst, zinc sulfide also has the problem of low photocatalytic efficiency in application. In order to improve the photocatalytic efficiency of zinc sulfide, researchers have made many explorations, such as doping transition metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
Inventor 刘淑玲李红霖仝建波
Owner SHAANXI UNIV OF SCI & TECH
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