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Crystal form control method for TiO2 in TiO2-ACF photocatalysis material

A photocatalytic material and crystal form control technology, applied in the field of photocatalytic materials, can solve the problems of affecting use, poor loading firmness, poor dispersion, etc., and achieve good firmness, good catalytic performance, and avoid agglomeration effects

Inactive Publication Date: 2014-01-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the larger catalyst particles after calcination, the firmness of its loading is not good, and the dispersion is not good, which affects the use

Method used

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  • Crystal form control method for TiO2 in TiO2-ACF photocatalysis material
  • Crystal form control method for TiO2 in TiO2-ACF photocatalysis material
  • Crystal form control method for TiO2 in TiO2-ACF photocatalysis material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Measure and mix 35ml of deionized water, 0.01mol sulfuric acid and 40ml of ethanol to obtain solution A; weigh 12.2g of tetra-n-butyl titanate and dissolve in 40ml of ethanol to obtain solution B. Under stirring conditions, solution B was added dropwise to solution A to obtain TiO 2 Precursor solution. The resulting precursor solution was crystallized under high temperature and high pressure conditions to obtain TiO 2 suspension. The resulting TiO 2 The XRD spectrum of the particles is attached figure 1 As shown, the TEM image is attached figure 2 shown. It can be seen from the XRD spectrum that the TiO prepared by this method 2 Has a good anatase crystal form. It can be seen from the TEM image that the particles basically have no agglomeration phenomenon, and the dispersion is good.

[0022] ACF of 10cm*10cm treated with nitric acid was added to the prepared TiO 2 impregnated in the suspension, taken out and dried to obtain TiO 2 - ACF catalyst. The ...

Embodiment 2

[0024] TiO 2 - Preparation of ACF catalyst: The catalyst was prepared in the same manner as in Example 1, except that 0.05 mol of sulfuric acid was added to the A solution. The loading strength of the catalyst reaches 82%. Evaluation of the prepared catalyst according to the same method as in Example 1, the degradation rate on the catalyst per unit area is 0.081 μmol / (cm 2 *h).

Embodiment 3

[0026] TiO 2 -Preparation of ACF catalyst: The catalyst was prepared in the same manner as in Example 1, except that the amount of deionized water was 6.5 ml, but sulfuric acid was not added. The loading strength of the catalyst reaches 81%. The prepared catalyst is evaluated according to the same method as in Example 1, and the degradation rate on the catalyst per unit area is 0.079 μmol / (cm 2 *h).

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Abstract

The invention belongs to the technical field of preparation of photocatalysis materials and discloses a crystal form control method for TiO2 in a TiO2-ACF photocatalysis material. The crystal form control method comprises the following steps: tetra-butyl ortho-titanate is taken out, then dissolved in alcohol, and mixed with a solution added with water, alcohol and nitric acid or vitriol, so that a TiO2 precursor solution is obtained; the precursor solution is heated, and TiO2 is dehydrated and crystallized under the environment of high temperature and high pressure; ACF treated by the nitric acid is placed in suspension for soaking, and then dried to form a TiO2-ACF catalyst. The pressure, the pH of the solution and the like can be changed during crystallization via changing the ratio of the water to alcohol and the amount of the added nitric acid or the vitriol during the preparation, so that the obtained crystal form of the TiO2 and the proportions of different crystal forms are changed. According to the invention, the obtained TiO2-ACF photocatalysis material can well remove toluene, and TiO2 particles are high in load firmness and do not easily fall off to cause secondary pollution.

Description

technical field [0001] The present invention relates to a kind of TiO 2 -TiO in ACF photocatalytic material 2 The method for crystal form control and loading belongs to the technical field of photocatalytic materials. Background technique [0002] With the rapid development of industry, the problem of environmental pollution is becoming more and more serious, which has aroused widespread concern. In particular, VOCs (volatile organic compounds, mainly formaldehyde, benzene, toluene, and xylene, etc.) in confined spaces such as indoors and cars can cause harm to the human body. Photocatalysis is an energy-saving and efficient oxidation technology, which can decompose volatile combustible gases into inorganic substances such as carbon dioxide and water, and has shown broad prospects in the elimination of VOCs. Nano-TiO 2 It is widely used in the field of photocatalysis because of its excellent photocatalytic performance and long-term use stability. Nano TiO 2 TiO support...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
Inventor 蒋新陈玉萍吴忠标
Owner ZHEJIANG UNIV
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