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A direct method to prepare molecularly imprinted tio2/wo3 composite photocatalyst with visible light response

A technology of molecular imprinting and visible light, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of low selectivity, expensive preparation materials, and complicated preparation processes and other problems, to achieve obvious economic benefits, high visible light activity, and simple preparation process

Inactive Publication Date: 2011-12-21
NANCHANG HANGKONG UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

When these low-concentration highly toxic organic pollutants coexist with high-concentration low-toxic or non-toxic pollutants, the coexisting high-concentration low-toxic or non-toxic pollutants will quickly reach the surface of TiO2 Therefore, how to prepare photocatalysts that can selectively degrade low-concentration and highly toxic pollutants has become one of the urgent issues in the field of environmental science. one
[0006]Recently, researchers at home and abroad have begun to pay attention to how to improve the selectivity of TiO2 photocatalytic treatment of environmental pollutants. The existing literature The reported ways to improve the selectivity of photocatalytic reactions mainly include the following three aspects: (1) adjust the pH of the solution to control the charge on its surface, but the selectivity is not high
(2) Use special molecules to modify the surface of TiO2, but the stability is poor
(3) Noble metal deposition modification, but the preparation materials are expensive and the cost is high
Although the molecularly imprinted photocatalyst prepared by this technique can selectively degrade the target pollutants, it has inherent disadvantages: the molecularly imprinted organic layer on the surface is degraded during the photocatalytic process, and the thickness of the molecularly imprinted organic layer on the surface is not suitable. Can affect the light absorption of photocatalysts
The preparation process of the above two preparation methods is complicated, and it is necessary to use acid-base washing or Soxhlet extraction to remove the template molecule, which is an inevitable problem when the template molecule remains.
Moreover, TiO2 has a forbidden band width of 3.2 eV, which can only be excited by ultraviolet light with a wavelength shorter than 387nm, and its quantum efficiency is low, which limits its application in the visible region.
In sunlight, ultraviolet light (2 prepared by the above two methods can utilize sunlight low rate

Method used

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  • A direct method to prepare molecularly imprinted tio2/wo3 composite photocatalyst with visible light response
  • A direct method to prepare molecularly imprinted tio2/wo3 composite photocatalyst with visible light response
  • A direct method to prepare molecularly imprinted tio2/wo3 composite photocatalyst with visible light response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Put 10mL of butyl titanate, 13mL of absolute ethanol, 2mL of glacial acetic acid and 0.4 g of 2-nitrophenol into an iodine flask, and call this liquid A liquid. In addition, mix 6mL absolute ethanol, 6mL glacial acetic acid and 4mL water evenly, and this mixture is B solution.

[0033] (2) Slowly drop liquid B into liquid A under vigorous stirring. After the dropwise addition, 5 mL of ammonium tungstate solution with a concentration of 0.014 mol / L was added dropwise while stirring. Stirring was continued for 3h, and the resulting sol was aged. The liquid loses its fluidity and becomes a wet gel.

[0034] (3) Dry the wet gel at 100°C for 12 hours to obtain a yellow gel block, which is ground to obtain a powder.

[0035] (4) Put the powder into a muffle furnace and calcinate at 500 °C for 3 h to remove the template molecules, and the TiO 2 Imprinted holes are left on the surface, while ammonium tungstate decomposes into WO 3 , Molecularly imprinted TiO was obtain...

Embodiment 2

[0037] (1) Put 10mL of ethyl titanate, 13mL of absolute ethanol, 2mL of glacial acetic acid and 0.4 g of 2-nitrophenol into an iodine flask, and call this liquid A liquid. In addition, mix 6mL absolute ethanol, 6mL glacial acetic acid and 4mL water evenly, and this mixture is B solution.

[0038] (2) Slowly drop liquid B into liquid A under vigorous stirring. After the dropwise addition, 5 mL of ammonium tungstate solution with a concentration of 0.014 mol / L was added dropwise while stirring. Stirring was continued for 3h, and the resulting sol was aged. The liquid loses its fluidity and becomes a wet gel.

[0039] (3) Dry the wet gel at 100°C for 12 hours to obtain a yellow gel block, which is ground to obtain a powder.

[0040] (4) Put the powder into a muffle furnace and calcinate at 500 °C for 3 h to remove the template molecules, and the TiO 2 Imprinted holes are left on the surface, while ammonium tungstate decomposes into WO 3 , Molecularly imprinted TiO was obtain...

Embodiment 3

[0042] (1) Put 10mL of isopropyl titanate, 13mL of absolute ethanol, 2mL of glacial acetic acid and 0.4 g of 2-nitrophenol into an iodine flask, and call this liquid A liquid. In addition, mix 6mL absolute ethanol, 6mL glacial acetic acid and 4mL water evenly, and this mixture is B solution.

[0043] (2) Slowly drop liquid B into liquid A under vigorous stirring. After the dropwise addition, 5 mL of ammonium tungstate solution with a concentration of 0.014 mol / L was added dropwise while stirring. Stirring was continued for 3h, and the resulting sol was aged. The liquid loses its fluidity and becomes a wet gel.

[0044] (3) Dry the wet gel at 100°C for 12 hours to obtain a yellow gel block, which is ground to obtain a powder.

[0045] (4) Put the powder into a muffle furnace and calcinate at 500 °C for 3 h to remove the template molecules, and the TiO 2 Imprinted holes are left on the surface, while ammonium tungstate decomposes into WO 3 , Molecularly imprinted TiO was ob...

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Abstract

The invention discloses a method for preparing a molecularly imprinted TiO2 / WO3 composite photocatalyst with visible light response through a direct method. The method is as follows: a titanium alkoxide is used as a sol and functional monomer precursor, an organic pollutant is used as a template molecule, absolute alcohol is used as a solvent, glacial acetic acid is used as an inhibitor, a sol-gel method is adopted, and the materials are prepared according to a certain ratio, wherein the molar ratio of the template molecule to Ti is 1:20-1:10, and the titanium alkoxide, absolute alcohol, glacial acetic acid and water are mixed in a volume ratio of 10:19:8:4. The method has the following technical effect: the titanium alkoxide has double functions, namely the titanium alkoxide can be used as a titanium source and can also be used as a functional monomer in the hydrolysis process. Other organic functional monomers are not required.

Description

technical field [0001] The invention relates to a method for preparing a composite photocatalyst, in particular to a method for preparing molecularly imprinted TiO with visible light response 2 / WO 3 Method for composite photocatalysts. Background technique [0002] With the continuous acceleration of the global industrialization process, environmental problems have become increasingly severe, and have become one of the three major global problems facing society today, alongside energy and population, seriously restricting economic and social development and the improvement of people's living standards. Among them, toxic organic substances are particularly serious in water pollution. This kind of pollutants has the characteristics of large discharge, wide range of pollution, and difficulty in biodegradation. The pollution control of them has always been a topic that environmental protection workers have been working hard to explore. There are many treatment methods for en...

Claims

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Application Information

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IPC IPC(8): B01J23/30C02F1/30C02F101/38C02F101/36
CPCY02W10/37
Inventor 罗胜联邓芳罗旭彪杨丽霞
Owner NANCHANG HANGKONG UNIVERSITY
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