In-situ preparing method for composite TiO2 and SiO2 thin film as photo-catalyst

A composite film, photocatalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high cost, difficult separation and recovery of powder, secondary pollution, etc.

Inactive Publication Date: 2005-03-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical application TiO 2 The powder photocatalyst also has the following defects: After the photocatalytic reaction, TiO 2 The powder is difficult to separate and recover from the aqueous solution, and there is a problem of secondary pollution, so it is necessary to treat TiO 2 The powder photocatalyst is immobilized, that is, TiO 2 Particles adhere to substrates such as quartz glass, boron glass, stainless steel and ceramics, or directly prepare TiO on the surface of various substrates 2 thin film photocatalyst
But these methods require very expensive and complex equipment
On the contrary, the sol-gel method is used to prepare titanium dioxide films on the surface of quartz glass substrates. Although no special equipment or devices are required, repeated coatings must be performed in order to obtain thicker titanium dioxide films.

Method used

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  • In-situ preparing method for composite TiO2 and SiO2 thin film as photo-catalyst
  • In-situ preparing method for composite TiO2 and SiO2 thin film as photo-catalyst
  • In-situ preparing method for composite TiO2 and SiO2 thin film as photo-catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Ammonium hexafluorotitanate and boric acid are used as raw materials to prepare aqueous solutions of ammonium hexafluorotitanate and boric acid respectively, and then the two aqueous solutions are mixed according to a set ratio, stirred evenly to prepare a precursor solution. The molar concentrations of ammonium hexafluorotitanate and boric acid in the resulting final solution were 0.1M and 0.3M respectively. After immersing the clean quartz glass sheet in the above prepared precursor solution at room temperature of 25°C, hang it vertically for 48 hours , taken out and rinsed with deionized water, dried, and then heat-treated at 700°C for 1 hour to obtain TiO 2 with SiO 2 Composite thin film photocatalyst, photocatalytic activity test results show that: the prepared TiO 2 with SiO 2 The composite thin film photocatalyst has good photocatalytic activity at 700℃. Its apparent rate constant is 6.20×10 -3 (min -1 ).

Embodiment 2

[0047] In order to examine the influence of heat treatment temperature on film quality and photocatalytic activity, except that the heat treatment temperature is different, other experimental conditions such as the concentration of ammonium hexafluorotitanate and boric acid, reaction temperature and time, heat treatment time, etc. are all exactly the same as in Example 1. The prepared samples were heat-treated at 100, 300, 400, 500, 600, 700, 800 and 900 °C for 1 hour to obtain TiO 2 with SiO 2 Composite thin film photocatalyst, photocatalytic activity test results show that: the prepared TiO 2 with SiO 2 The composite thin film photocatalyst has the highest photocatalytic activity at 700 °C. Figure 4 Indicates the heat treatment temperature for TiO 2 with SiO 2 Effect of composite thin films on photocatalytic activity. from Figure 4 It can be seen that when the heat treatment temperature is lower than 400 °C, the film has almost no photocatalytic activity, which is du...

Embodiment 3

[0049] In order to test the influence of heat treatment time on film quality and photocatalytic activity, except that heat treatment time is different, other experimental conditions such as the concentration of ammonium hexafluorotitanate and boric acid, reaction temperature and time, heat treatment temperature, etc. are all exactly the same as in Example 1. The prepared samples were heat-treated at 700°C for 0.5, 1, 2, 3, 5 and 10 hours respectively to obtain TiO 2 with SiO 2 Composite thin film photocatalyst, photocatalytic activity test results show that: the prepared TiO 2 with SiO 2 The composite thin film photocatalyst has the highest photocatalytic activity after heat treatment at 700°C for 1-2 hours. When the heat treatment time is less than 1 h, the film has no good photocatalytic activity, which is due to the poor crystallization of the film sample and the SiO 2 caused by low content. When the heat treatment time is higher than 3 hours, the photocatalytic activit...

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Abstract

The in-situ preparation process of composite TiO2 and SiO2 film as photocatalyst is one liquid phase deposition-heat treatment process. The process includes compounding supersaturated water solution with the material including ammonium fluorotitanate and/or titanium tetrafluoride and boric acid and/or aluminum powder; soaking glass suibstrate into the supersaturated water solution for some time; flushing the soaked glass suibstrate, stoving and high temperature heat treatment at 400-1100 deg.c to obtain the composite TiO2 and SiO2 film as photocatalyst. The process is simple.

Description

technical field [0001] The present invention relates to highly photoactive TiO 2 with SiO 2 The in-situ preparation method of composite thin film semiconductor photocatalyst, the invention also relates to the technical field of preparation of other composite semiconductor oxide thin film materials. technical background [0002] In recent years, in order to solve the increasingly serious problem of environmental pollution, the research and development of highly active heterogeneous semiconductor photocatalytic materials has received extensive attention from governments and researchers all over the world. There are more and more research papers and patents in this area, and every year Thousands of research papers have been published, because this kind of photocatalytic materials can be widely used in the degradation of organic pollutants, water and air purification, sterilization and disinfection, self-cleaning ecological building materials and other fields, which have genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/03
Inventor 余家国余火根程蓓
Owner WUHAN UNIV OF TECH
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