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Low-temp. solvent evaporation induced crystallization process for preparing crystallized titanium dioxide photocatalyst

A technology of titanium dioxide and photocatalyst, applied in catalyst activation/preparation, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of drop, particle growth, specific surface area, etc.

Inactive Publication Date: 2004-11-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the other hand, the increase of heat treatment temperature will lead to the growth of particles and the decrease of specific surface area. Titanium dioxide photocatalysts, like other catalytic materials, need to have large specific surface area and small particle size in order to have more reactive centers to participate in the reaction. , enhanced activity

Method used

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  • Low-temp. solvent evaporation induced crystallization process for preparing crystallized titanium dioxide photocatalyst
  • Low-temp. solvent evaporation induced crystallization process for preparing crystallized titanium dioxide photocatalyst
  • Low-temp. solvent evaporation induced crystallization process for preparing crystallized titanium dioxide photocatalyst

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Embodiment 1

[0021] The method for preparing nanocrystalline titanium dioxide powder photocatalyst by low-temperature solvent evaporation-induced crystallization is as follows: using isopropyl titanate as the titanium source, add 0.063M isopropyl titanate organic solvent dropwise to 113 ml of distilled water for hydrolysis while stirring vigorously , The time is 1 hour, the molar ratio of water to isopropyl titanate is 100:1, the titania sol sample obtained by hydrolysis is placed and aged at 25°C for 24 hours, then the sample is placed in an oven and gradually evaporated at 100°C Water and organic solvent to obtain titanium dioxide xerogel powder. Finally, the dry gel is ground finely to obtain a titanium dioxide powder photocatalyst.

[0022] figure 1 Shows the XRD patterns of titanium dioxide wet gel and dry gel, from figure 1 It can be seen that the titanium dioxide wet gel obtained by the direct hydrolysis of isopropyl titanate is in an amorphous state, however, the titanium dioxide dr...

Embodiment 2

[0027] Except that the titanium source used is n-butyl titanate, other reaction conditions such as the concentration of the titanium source, the amount of solvent water, the temperature and time of hydrolysis, aging and solvent evaporation are exactly the same as in Example 1. The obtained titanium dioxide The phase structure and composition of the powder photocatalyst are: anatase occupies 67%, and the brookite phase occupies 33%. According to the Scherrer formula, the grain sizes of the anatase and brookite phases are calculated to be 5.0 and 3.1 nm, respectively. The titanium dioxide photocatalyst prepared with n-butyl titanate as the titanium source also shows very high photocatalytic activity, and its apparent rate constant is 3.72×10 -3 (min -1 ), and the photocatalytic degradation rate constant of Degussa P25 is 4.19×10 -3 (min -1 ) Close.

Embodiment 3

[0029] The temperature at which the solvent evaporates is 140°C. Except for the different evaporation temperature of the solvent, other reaction conditions such as the concentration of the titanium source, the concentration of the titanium source, the amount of solvent water, the temperature and time of hydrolysis and aging, and the time of solvent evaporation are exactly the same as in Example 1. The titanium dioxide powder photocatalyst shows higher photocatalytic activity, and its apparent rate constant is 3.91×10 -3 (min -1 ). This may be due to the better crystallinity of the prepared titanium dioxide powder photocatalyst.

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Abstract

The present invention provides a low-temp. solvent evaporation induced crystallization method for preparing nano crystal titanium dioxide. Said invention method includes the following steps: hydrolyzing alcohol salt of titanium in water, then ageing, finally progressively evaporating solvent at 80-180 deg.C, at the same time inducing titanium dioxide to crystallize so as to obtain the invented nano crystallized titanium dioxide photocatalyst material. By reducing phase-transition temperature the titanium dioxide photocatalyst obtained by said invention possesses high catalytic activity approaching to Degussa P25, large specific surface area (greater than 250 sq.m / g) and small grain size (less than 6nm).

Description

Technical field [0001] The invention relates to a preparation technology of a semiconductor oxide nanocrystalline material with a high specific surface area and a small particle size, in particular to a preparation method of a high photoactive mesoporous titanium dioxide photocatalytic material. technical background [0002] In recent years, in order to solve the increasingly serious environmental pollution problem, the research and development of high-activity heterogeneous photocatalytic materials has received extensive attention from governments and researchers around the world, because such photocatalytic materials can be widely used in air purification and water purification. Sterilization, degradation and removal of toxic and harmful pollutants in water, etc. Among various oxide semiconductor photocatalytic materials, practice has proved that titanium dioxide is most suitable for a wide range of environmental applications, because of its biological and chemical inertness, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/03C01G23/053
Inventor 余家国余济美程蓓赵修建
Owner WUHAN UNIV OF TECH
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