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Synthesis of photocatalyst for mesoporous TiO2 nano molecular sieve film

A technology of mesoporous molecular sieves and photocatalysts, which is applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., and can solve problems such as unsatisfactory photocatalytic effects, condensation, and easy poisoning

Inactive Publication Date: 2003-02-26
TIANJIN UNIV
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Problems solved by technology

[0003] Chinese patent CN1342517 discloses the preparation of mesoporous TiOw powder and TiOw film by sol-gel method. The catalyst obtained by this method has high photocatalytic activity and has a vertical open pore structure (this structure is beneficial to photocatalytic reaction and improved activity) , but the prepared TiOw powder has the disadvantages of being difficult to separate and recycle, and prone to poisoning and agglomeration
However, its photocatalytic effect on other pollutants in water such as carbon tetrachloride, chlorobenzene, polychlorobenzene, etc. is not ideal, and it has great limitations.

Method used

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specific Embodiment approach

[0021] The specific embodiment The present invention will be further described below in conjunction with embodiment:

[0022] 1. Preparation of mesoporous titanium silicon support

[0023] Use 25% tetramethylammonium hydroxide to adjust the pH of 8% cetyltrimethylammonium bromide aqueous solution to 11.0-12.0, stir for 30 minutes; at room temperature, dissolve ethyl orthosilicate in anhydrous Butyl orthotitanate in the mixture of ethanol and isopropanol is added to the above solution, ethyl orthosilicate in the raw material solution: butyl orthotitanate: tetramethylammonium hydroxide: water: hexadecyltri The molar ratio of methyl ammonium bromide is 1.0: 0.02: 0.40: 120: 0.25 to form a gel, which is placed at room temperature for 24 hours. After the solid product is filtered, it is washed several times with double distilled water and dried at 120°C for 2 hours in an air flow. , Calcined at 700 ° C for 4h to remove the template agent, that is, the mesoporous titanium silicon s...

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Abstract

The present invention discloses a synthetic method for nanometre Ti-Si mesoporous molecular sieve membrane photocatalyst including preparation of mesoporous Ti-Si support body; preparation of isopropanol titanium-acetone solution; preparation of titanium polymerized sol; and preparation of TiO2 membrane, soaking the mesoporous Ti-Si support body in titanium polymerized sol with 1.9-2.5E(-4) Pa.s viscosity for 0.5-2 min before being taken out and dried naturally for 44-52 hr to form a gel layer, then drying in vacuum drier, calcining to 630-670 deg.C and air-cooling to obtain nanometer mesoporous TiO2 molecualr sieve membrane photocatlayst. The support body of the present invention has pore size of about 8.2 nm and specific surface area of 620 sq m / g, and is applied to degrading the organic halide in water.

Description

technical field [0001] The present invention relates to a kind of synthetic method of photocatalyst, relate in particular to a kind of nanometer TiO 2 Synthesis method of mesoporous molecular sieve membrane photocatalyst. technical background [0002] In the 1980s, it was found that semiconductors can effectively catalyze and oxidize organic pollutants into carbon dioxide, water, chloride ions and other inorganic substances. At the same time, with the deepening of global environmental protection awareness, photocatalytic elimination of organic pollution (organic pollutants in air and water) has aroused widespread interest in the scientific and technological community. Since the 1990s, it has been practically applied in the treatment of oil pollution in water, and the elimination of organic waste gas in tunnels and kitchens. TiO 2 As a photocatalyst, it has the advantages of high activity, safety, low cost, and no pollution. It is one of the ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J29/89B01J37/02
Inventor 谭欣赵林何怀平陈林
Owner TIANJIN UNIV