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Zinc and silicon coblended nano TiO2 light catalyst and its preparing method and use

A nano-titanium dioxide, photocatalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of photocatalytic activity change, change of lattice type, etc. , to achieve the effect of simple operation, wide application and tight integration

Inactive Publication Date: 2008-06-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at these two problems, many researchers regard TiO 2 Loaded on the adsorbent, a relatively high-concentration environment is formed around the catalyst through the adsorption of the adsorbent, thereby increasing the decomposition rate of the reaction substance; there are also many researchers who introduce metal ions into TiO 2 Inside the lattice, forming defects or changing the lattice type, resulting in a change in its photocatalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using n-butyl titanate as the precursor of titanium dioxide, ethyl orthosilicate as the precursor of silicon doping, Zn(NO 3 ) 2 ·6H 2 O is a zinc-doped precursor, and Si: Zn: Ti = 0.01: 0.001: 1 nanometer TiO is prepared 2 Photocatalyst, the reaction of photocatalytic degradation of benzene, toluene, and xylene is carried out in a batch reactor, and the initial reaction conditions are: the initial concentration of benzene, toluene, and xylene is 58 mg / m 3 、60mg / m 3 , 53mg / m 3 , the humidity is 55%, the reaction temperature is 25°C, and the catalyst loading is 1.51mg / cm 2 . Based on the apparent reaction rate constant k and the degradation efficiency of P25 under the same experimental conditions, the results show that the k values ​​of the catalyst for benzene, toluene, and xylene are 1.6 times, 2.1 times, and 1.8 times that of P25, respectively.

Embodiment 2

[0022] Using n-butyl titanate as the precursor of titanium dioxide, ethyl orthosilicate as the precursor of silicon doping, Zn(NO 3 ) 2 ·6H 2 O is a zinc-doped precursor, and Si: Zn: Ti = 0.01: 0.01: 1 nanometer TiO is prepared 2 Photocatalyst, the photocatalytic degradation of benzene, toluene, and xylene is carried out in a batch reactor. The initial reaction conditions are: the initial concentration of benzene, toluene, and xylene is 60mg / m 3 、65mg / m 3 , 58mg / m 3 , the humidity is 55%, the reaction temperature is 25°C, and the catalyst loading is 1.51mg / cm 2 . Based on the apparent reaction rate constant k and the degradation efficiency of P25 under the same experimental conditions, the results show that the k values ​​of the catalyst for benzene, toluene, and xylene are 2.1 times, 3.5 times, and 2.5 times that of P25, respectively.

Embodiment 3

[0024] Using n-butyl titanate as the precursor of titanium dioxide, ethyl orthosilicate as the precursor of silicon doping, Zn(NO 3 ) 2 ·6H 2 O is a zinc-doped precursor, and Si: Zn: Ti = 0.01: 0.1: 1 nanometer TiO is prepared 2 Photocatalyst, the photocatalytic degradation of benzene, toluene, and xylene is carried out in a batch reactor. The initial reaction conditions are: the initial concentration of benzene, toluene, and xylene is 60mg / m 3 、65mg / m 3 , 58mg / m 3 , the humidity is 55%, the reaction temperature is 25°C, and the catalyst loading is 1.51mg / cm 2 . Based on the apparent reaction rate constant k and the degradation efficiency of P25 under the same experimental conditions, the results show that the k values ​​of the catalyst for benzene, toluene, and xylene are 1.6 times, 2.5 times, and 1.9 times that of P25, respectively.

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Abstract

The present invention discloses Zn and Si co-blended nanometer TiO2 light catalyst and its preparation and application. The catalyst is used mainly for controlling indoor air pollution, and is prepared through a sol-gel process. During the preparation, Zn and Si are added in the molar ratio Si to Zn to Ti equal to (0.01-1.0) to (0.001-1.0) to 1. The preparation process is simple and feasible. The catalyst is used in intermittent reactor for light catalyzed reaction with toluene to produce harmless CO2, water and other product.

Description

technical field [0001] The invention relates to a nano-titanium dioxide photocatalyst co-doped with zinc and silicon, a preparation method thereof and an application of photocatalytic degradation of organic matter. The catalyst is mainly used in the technical field of indoor air pollution control. Background technique [0002] About 70% to 90% of people's life is spent indoors, and the pollution that people suffer mainly comes from indoor air pollution. According to the "2002 World Health Report" released by the World Health Organization, nearly half of the people in the world are exposed to indoor air pollution, and indoor environmental pollution has caused 35.7% of respiratory diseases, 22% of chronic pneumonia and 15% of bronchitis , bronchitis and lung cancer. And indoor environmental pollution and high blood pressure, high cholesterol and obesity are listed as the top ten killers of human health. Based on this, my country formulated and promulgated and implemented the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J21/06B01J31/12B01J37/00B01J37/04
Inventor 吴忠标曹振娟赵伟荣
Owner ZHEJIANG UNIV