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Method for preparing compound nanometer photocatalyst by adopting CdSe quantum dot

A nano-photocatalyst and quantum dot solution technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low light energy efficiency, large band gap, etc., and achieve large specific surface area , promote the mass transfer process, the effect of less processing steps

Inactive Publication Date: 2014-01-29
DALIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, in the process of using photocatalysts, there are still many deficiencies that limit its application.
Among them, due to TiO 2 It has a large band gap, and its light absorption range is mainly in the ultraviolet spectral range. When sunlight or visible light is used as the light source, the efficiency of utilizing light energy is low, and less than 5% of sunlight can be used (P.Roy, P.Schmuki et al., Nanoscale.2010, 2:45)

Method used

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  • Method for preparing compound nanometer photocatalyst by adopting CdSe quantum dot
  • Method for preparing compound nanometer photocatalyst by adopting CdSe quantum dot
  • Method for preparing compound nanometer photocatalyst by adopting CdSe quantum dot

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: Preparation of CdSe quantum dot solution

[0022] Take 0.075g of sodium borohydride and add it into 10ml of deionized water filled with nitrogen, then add 0.079g of selenium powder into the above solution, and react for 2h at ice bath temperature to obtain a NaHSe saturated solution. Take 0.1833g of cadmium chloride and add it to 50mL of deionized water, then take 0.5mL of 3-mercaptopropionic acid. Finally, the pH value of the solution was adjusted to 11.0 by NaOH solution, and stirred for 30 min. Finally, all the fresh NaHSe saturated solution was injected into the cadmium precursor solution to obtain an orange-red solution. Heat and stir at 80° C. for 1 h to prepare CdSe quantum dots. Finally, wash with acetone for 3 times to obtain a cadmium selenide quantum dot solution.

Embodiment 2

[0024] According to the preparation method of Example 1, wherein the pH value of the solution is 9.0, a cadmium selenide quantum dot solution is prepared.

Embodiment 3

[0026] According to the preparation method of Example 1, wherein the pH value of the solution is 10.0, a cadmium selenide quantum dot solution is prepared.

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Abstract

The invention discloses a method for synthesizing a cadmium selenide quantum dot modified titanium dioxide compound photocatalyst. The method for synthesizing the cadmium selenide quantum dot modified titanium dioxide compound photocatalyst comprises the following steps: 1) preparing cadmium selenide quantum dots in different grain diameters by adopting an aqueous phase synthesis method by virtue of selenide powder and CdCl2 under an alkali condition; 2) by adopting a sol-gel method, preparing spherical titanium dioxide powder with tetrabutyl titanate as a titanium source and ethanol as a solvent while the synthesized cadmium selenide quantum dots are added, so that the compound photocatalyst is prepared. The method for synthesizing the cadmium selenide quantum dot modified titanium dioxide compound photocatalyst has the advantages that narrow-bandwidth semiconductor cadmium selenide quantum dot modified titanium dioxide is used for preparing the compound photocatalyst which can absorb visible light, operation is easy, and performance is stable; meanwhile, a better pollutant degradation effect is realized, so that the method for synthesizing the cadmium selenide quantum dot modified titanium dioxide compound photocatalyst has a good application prospect.

Description

technical field [0001] The invention relates to a synthesis method of a visible light-responsive photocatalyst, in particular to the preparation of a titanium dioxide composite nano photocatalyst modified by a narrow-band semiconductor CdSe quantum dot. Background technique [0002] Since semiconductor TiO 2 Since the electrode was found to have the effect of photocatalytic water splitting, the TiO 2 As a photocatalyst for sewage treatment and other research has attracted great attention. TiO 2 Photocatalysts have relatively stable chemical properties, low cost, low toxicity, high catalytic activity, and strong oxidation ability. Therefore, with TiO 2 As a photocatalyst advanced oxidation technology, it has been widely used in the removal of waste water and exhaust gas pollutants. However, there are still many deficiencies in the use of photocatalysts that limit their applications. Among them, due to TiO 2 It has a large band gap, and its light absorption range is mai...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/10C02F1/30
Inventor 石勇柯军肇启东李春艳李新勇
Owner DALIAN UNIV OF TECH
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