Artificial anitibody type composite photocatalyst and its prepn. method

A catalyst and recombination light technology, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of low sunlight utilization ratio and high carrier recombination probability , low quantum efficiency and other issues, to achieve the effect of broadening the absorption wavelength range, wide pH range, and simple preparation process

Inactive Publication Date: 2006-11-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current photocatalysts mainly have the following disadvantages: one is that the absorption wavelength range of light is narrow, and the absorption wavelength range is mostly in the ultraviolet region, and the utilization ratio of sunlight is low (only 3% to 5%), and it is difficult to process large and Highly concentrated industrial wastewater
Second, the probability of carrier recombination is high, and the quantum efficiency is low, about 4%, and the highest is no more than 10%.
This leads to TiO 2 Used in sewage treatment is not only expensive, but also slow
The third is the non-selectivity of the photocatalytic reaction process
[0005] Although these techniques can improve the TiO 2 The ability of photocatalysts to degrade organic pollutants, but cannot selectively degrade some highly toxic organic pollutants, that is, when high concentrations of low-toxic pollutants and low concentrations of highly toxic pollutants coexist in the pollution system, the existing TiO 2 Photocatalysts cannot effectively treat low-concentration persistent toxic pollutants

Method used

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  • Artificial anitibody type composite photocatalyst and its prepn. method
  • Artificial anitibody type composite photocatalyst and its prepn. method
  • Artificial anitibody type composite photocatalyst and its prepn. method

Examples

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Effect test

example 1

[0039] Example 1: In a 100mL beaker, add 0.2mol monomeric o-phenylenediamine and 5×10 -4 mol of 4-chlorophenol, then added 30 mL of distilled water, and stirred at 65°C for 30 min. Add 2g TiO to the beaker 2 , ultrasonically disperse for 15 minutes to make a suspension, adjust the pH of the solution to 2.3, control the temperature of the solution to 65° C., and stir for 6 hours. Suction filter the modified nanoparticles, and use 0.025mol / L Na 2 CO 3 The nanoparticles were washed 5 times with aqueous solution and then 5 times with distilled water. The nanoparticles were dried at 86 °C for 2 h and ground with a mortar to obtain a poly-o-phenylenediamine / TiO with specific selectivity for 4-chlorophenol 2 Powdered artificial antibody type composite photocatalyst.

example 2

[0040] Example 2: Add 0.3mol monomeric aniline and 3×10 to a 100mL beaker -5 mol of 4-nitrophenol, then added 40 mL of distilled water, and stirred at 25°C for 30 min. Add 1.8g TiO to the beaker 2 , ultrasonically disperse for 10 min to make a suspension, adjust the pH value of the solution to 5, control the temperature of the solution to 30° C., and stir for 10 h. Suction filter the modified nanoparticles, and use 0.025mol / L Na 2 CO 3 The nanoparticles were washed 5 times with aqueous solution and then 5 times with distilled water. The nanoparticles were dried at 86 °C for 2 h and ground with a mortar to obtain a polyaniline / TiO with specific selectivity for 4-nitrophenol 2 Powdered artificial antibody type composite photocatalyst.

example 3

[0041] Example 3: In a 100mL beaker, add 0.25mol monomeric o-phenylenediamine and 0.05mol monomeric pyrrole and 5×10 -3 mol of 2,6-dichlorophenol, and then 50 mL of distilled water was added, and the reaction was stirred at 35°C for 30 min. Add 1.5g TiO to the beaker 2 , ultrasonically disperse for 10 min to make a suspension, adjust the pH value of the solution to 5.5, control the temperature of the solution to 70° C., and stir for 48 h. Suction filter the nanoparticles and use 0.025mol / L Na 2 CO 3 The nanoparticles were washed 5 times with aqueous solution and then 5 times with distilled water. The nanoparticles were dried at 86°C for 2 h and ground with a mortar to obtain an o-phenylenediamine, pyrrole copolymer / TiO with specific selectivity for 2,6-dichlorophenol 2 Powdered artificial antibody type composite photocatalyst.

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Abstract

An artificial antibody-type composite photocatalyst for recognizing and degradating toxic organic pollutents features that TiO2 is used as its base and the organic pollutent's molecular engram modified layer is used as its molecule recognizing layer. Its preparing process includes such steps as mixing functional monomers with target pollutent, reaction to generate precursor, and polymerizing reaction while coating on the surface of TiO2.

Description

technical field [0001] The present invention is a titanium dioxide (TiO 2 ) as a substrate, an artificial antibody type composite photocatalyst with an organic pollutant molecularly imprinted modified layer as a molecular recognition layer and a preparation method thereof. technical background [0002] There are many treatment methods for environmental wastewater, among which microbial method is the longest, most widely used and effective method in sewage treatment. However, with the development of science and technology, the types of organic matter are increasing, many of which are difficult to deal with by traditional physical and chemical methods. In particular, some toxic persistent organic pollutants in sewage are more likely to cause the death of all microorganisms in the treatment of sewage by microbial methods. Therefore, it is necessary to find an effective treatment method for these refractory organics. [0003] Semiconductor photocatalysts have attractive prosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J31/06B01J31/02C02F1/32
CPCY02W10/37
Inventor 朱丽华沈先涛唐和清
Owner HUAZHONG UNIV OF SCI & TECH
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