Method for preparing photocatalyst for sensitization of TiO2 nanotubes by semiconductor quantum dots

A quantum dot sensitization and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult excitation and instability of light, and achieve improved utilization and safe use , Wide application prospects

Inactive Publication Date: 2010-06-09
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has always been such a contradiction in semiconductor materials used for photochemical conversion, that is, the band gap with good stability is too wide (such

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a) Mix 0.5g of titanium dioxide powder with 30ml of 10mol / l NaOH solution, stir for 5 minutes, pour into a 50ml reaction kettle, and seal; hydrothermally react at 150°C for 24 hours;

[0022] b) After cooling to room temperature, filter with suction, rinse with deionized water several times, then add the powder to 1mol / l dilute hydrochloric acid and soak for 6 hours before filtering. After repeated washing with water and dilute hydrochloric acid for several times, dry, and then wash with 2% HCl 2 o 2 The solution was refluxed at 40°C for 4 hours, filtered and washed, dried at 90°C for 10 hours, calcined at 350°C for 75 minutes, and after slowly cooling down to room temperature, the powder was ground to obtain TiO 2 nanotube powder

[0023] c), take 0.3g TiO 2 After the nanotube powder was mixed with 30ml thioglycolic acid (TGA) and stirred for 30 minutes, after reacting at 60°C for 10 hours, 30ml 0.2mol / lPb(NO 3 ) 2 Solution, adjust the pH value to 7.5, stir for 15...

Embodiment 2

[0026] Other conditions are the same as in Example 1, the pH value is adjusted to 4.3, the photocatalytic experiment steps are the same as in Example 1, and the degradation rate of the dye is 94.6% after the experiment.

Embodiment 3

[0028] Other conditions are the same as in Example 1, the pH value is adjusted to 10.2, the photocatalytic experiment steps are the same as in Example 1, and the degradation rate of the dye is 95.6% after the experiment.

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Abstract

The invention discloses a method for preparing a photocatalyst for the sensitization of TiO2 nanotubes by semiconductor quantum dots, which comprises: firstly, obtaining TiO2 nanotube powder by using an acid and alkali hydrothermal synthesis method; secondly, mixing and stirring the nanotube powder and thioglycollic acid to perform a reaction at 50 to 100 DEG C for several hours, adding the reaction solution into solution of nitrate, adjusting the pH value of the mixed solution, stirring the mixed solution, filtering the mixed solution, washing an obtained precipitate, adding the precipitate into solution of Na2S, stirring the solution, filtering the solution and washing the resulting product to obtain the TiO2 nanotubes sensitized by the semiconductor quantum dots; or synthesizing solution of quantum dots, ultrasonically mixing the solution with the nanotube powder, filtering a resulting product and washing the resulting product to obtain the TiO2 nanotubes sensitized by the semiconductor quantum dots. The method of the invention is simple, easy to implement, safe and energy-saving and can be used in dye and environmental protection industries and used for developing solar cells.

Description

technical field [0001] The invention relates to the preparation of inorganic materials, especially a semiconductor quantum dot sensitized TiO 2 The preparation method of the nanotube photocatalyst can be used for industrial wastewater treatment, dye degradation and preparation of sensitized solar cells. Background technique [0002] In recent years, the application research of photocatalytic technology in environmental treatment, disinfection and sterilization has developed extremely rapidly. Oxidation of organic pollutants to CO at room temperature using solar energy, photocatalytic oxidation technology 2 、H 2 Simple molecules of inorganic substances such as O, inorganic pollutants can also be oxidized or reduced to harmless substances, and the reaction conditions are mild and the equipment is simple, which has incomparable advantages over traditional catalytic technology and adsorption technology; among them, TiO 2 Because of its stable chemical properties, non-toxicity...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J27/057B01J21/06
Inventor 丁旵明温艳媛汪燕
Owner EAST CHINA NORMAL UNIVERSITY
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