Preparation method of ultraviolet wideband photocatalyst

A photocatalyst and broadband technology, which is applied in the field of photocatalyst preparation, can solve the problems of low solar energy utilization rate, large band gap, and inability to give full play to the photocatalytic effect, and achieve the advantages of reduced catalytic time, simple operation, and high catalytic efficiency Effect

Inactive Publication Date: 2016-07-06
常州市鼎升环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: for the TiO prepared at present 2 The photocatalyst has a large bandgap and can only respond to the ultraviolet light part which accounts for 3% to 5% of the solar spectrum. The utilization rate of solar energy is not high, and its photocatalytic effect cannot be fully exerted. Mixing acid to prepare salicylate resin, and then dispersing and mixing nano-titanium dioxide and salicylate to prepare photocatalyst, absorbing ultraviolet rays through salicylate, and then undergoing molecular rearrangement under ultraviolet irradiation to minimize its ultraviolet absorption function, greatly improving the absorption range of nano-titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, add 10g of salicylic acid and 50mL of dichloromethane into a four-necked flask equipped with a stirrer, stir and mix and heat up to 45°C. After heating for 15 minutes, continue to add 15mL of styrene and 25% mass concentration. sulfuric acid solution, stirred and mixed and incubated for 2 hours; after the insulation reaction was completed, a sodium hydroxide solution with a mass concentration of 10% was added to it, and after the pH was adjusted to 7.0, methylene chloride was removed by distillation under reduced pressure, and then continued Add 8 mL of zinc sulfate solution with a mass concentration of 10%, stir and mix, and place it at 45°C for 1 hour of heat preservation reaction. After the reaction is completed, filter it and collect the filter cake, wash it with deionized water until the pH reaches 7.0, and prepare Modified salicylate resin; according to the mass ratio of 1:10, the modified salicylic acid resin prepared above is placed in toluene, stirred and...

example 2

[0020] First, add 12g of salicylic acid and 52mL of dichloromethane into a four-neck flask equipped with a stirrer, stir and mix and heat up to 47°C. After 17min of heat preservation, continue to add 17mL of styrene and a mass concentration of 25%. sulfuric acid solution, stirred and mixed and incubated for 2.5 hours; after the insulation reaction was completed, a sodium hydroxide solution with a mass concentration of 10% was added to it, and after the pH was adjusted to 7.2, dichloromethane was removed by distillation under reduced pressure, and then Continue to add 9mL of zinc sulfate solution with a mass concentration of 10%, stir and mix, and place it at 48°C for 1.5h. After the reaction is completed, filter it and collect the filter cake, wash it with deionized water until the pH reaches 7.0, Prepare modified salicylic acid ester resin; Press the mass ratio of 1:10, place the modified salicylic acid resin prepared above in toluene, stir and mix and make it completely disso...

example 3

[0023] First, add 15g of salicylic acid and 55mL of dichloromethane into a four-neck flask equipped with a stirrer, stir and mix and heat up to 50°C. After heating for 20min, continue to add 20mL of styrene and 25% mass concentration. sulfuric acid solution, stirred and mixed and incubated for 3 hours; after the insulation reaction was completed, a sodium hydroxide solution with a mass concentration of 10% was added to it, and after the pH was adjusted to 7.5, dichloromethane was removed by distillation under reduced pressure, and then continued Add 10 mL of zinc sulfate solution with a mass concentration of 10%, stir and mix, and place it at 60°C for 2 hours of heat preservation reaction. After the reaction is completed, filter it and collect the filter cake, wash it with deionized water until the pH reaches 7.0, and prepare Modified salicylate resin; according to the mass ratio of 1:10, the modified salicylic acid resin prepared above is placed in toluene, stirred and mixed t...

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Abstract

The invention relates to a preparation method of an ultraviolet wideband photocatalyst and belongs to the field of preparation of photocatalysts. Aiming at the problems of a TiO2 photocatalyst, which is prepared at present, that the forbidden band width is relatively large, only an ultraviolet light part occupying 3%-5% of a solar light spectrum can be responded, the utilization rate of solar energy is not high and the photocatalytic effect cannot be sufficiently expressed, the invention provides the preparation method which comprises the following steps: mixing styrene and salicylic acid to prepare salicylate resin; and dispersing and mixing nano titanium dioxide and salicylate to prepare the photocatalyst. Ultraviolet light is absorbed through the salicylate and molecular rearrangement is carried out under the illumination of the ultraviolet light, so that the ultraviolet light absorption effect is realized. The ultraviolet absorption wavelength of the prepared ultraviolet wideband photocatalyst can reach 350nm-380nm, the catalysis efficiency is high, the catalysis time is reduced by 30%-45%, and the de-coloring rate reaches more than 93%; and the ultraviolet wideband photocatalyst is prepared from the salicylic acid and tetrabutyl titanate, is simple to operate and is green and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of an ultraviolet broadband photocatalyst, belonging to the field of photocatalyst preparation. Background technique [0002] TiO 2 (TiO 2 ) heterogeneous photocatalytic technology is currently one of the most promising environmental pollution control methods for degrading organic pollutants, and has attracted extensive attention from experts and scholars in the field of photocatalysis worldwide. In 1972, Japanese scientists Fujishima and Honda published an article on TiO 2 The research results of photocatalytic water splitting on electrodes, which convert solar energy into chemical energy and closely link electrochemistry and photocatalysis, are considered to be a sign of the beginning of a new era of heterogeneous photocatalysis. Since then, TiO 2 As a typical semiconductor photocatalyst, it has been deeply studied. At present, the catalysts used for photodegradation mainly include TiO 2 , CdS, ZnO,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38
CPCB01J31/06B01J31/38B01J35/39
Inventor 许斌高力群
Owner 常州市鼎升环保科技有限公司
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