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Method for immobilization of titanium dioxide and application of titanium dioxide

A titanium dioxide and silicon dioxide technology, applied in chemical instruments and methods, chemical/physical processes, special compound water treatment, etc., can solve the problems affecting catalyst firmness, catalyst shedding, etc. The effect of good catalytic degradation activity

Active Publication Date: 2017-05-31
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be cracks on the surface of silica sol immobilized titanium dioxide, which will affect the firmness of the catalyst, easily cause the catalyst to fall off, and affect the use

Method used

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  • Method for immobilization of titanium dioxide and application of titanium dioxide
  • Method for immobilization of titanium dioxide and application of titanium dioxide
  • Method for immobilization of titanium dioxide and application of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Mix the binder silica sol and P25 according to the mass ratio of silicon dioxide and titanium dioxide of the silica sol is 3:4, add 10 mL of water, stir for 10 min, add 2% of the mass of titanium dioxide as a dispersant sodium hexametaphosphate , mixed and stirred for 3 h, sprayed on the pretreated aluminum alloy mesh with a spray gun, and dried in an oven at 160 °C for 1 h to obtain a silica sol-supported titania catalyst.

Embodiment 2

[0063] A method for immobilizing titanium dioxide, comprising the steps of:

[0064] Step S1: After uniformly mixing 25 g of silica sol and silane coupling agent KH-570, adjust the pH to 2 with hydrochloric acid, add titanium dioxide, add 10 mL of water, stir for 10 min, and stir well; wherein, the titanium dioxide and silica sol The mass ratio of silicon dioxide in the medium is 1:2, 3:5, 1:1, 4:3, 2:1 to carry out experiments respectively, and titanium dioxide is immobilized;

[0065] Step S2: Add sodium hexametaphosphate, the amount of sodium hexametaphosphate is 2% of the mass of titanium dioxide, mix and stir for 1 hour, spray it on the pretreated aluminum alloy mesh with a spray gun, and dry it in an oven at 160°C for 1 hour h, obtaining a silica sol immobilized titania catalyst.

[0066] image 3 It is the effect curve of toluene degradation by catalysts loaded with different mass ratios of titanium dioxide and silicon dioxide. from image 3 It can be seen that with...

Embodiment 3

[0070] The particle size of the photocatalyst has a great influence on the catalyst, and the smaller particle size can generally make the catalyst show better photocatalytic effect. In the process of immobilizing the catalyst by the bonding method, the dispersion of titanium dioxide particles in the binder has a great influence on the photocatalyst.

[0071] Therefore, in the process of preparing the photocatalyst by the bonding method, different dispersants were added, including sodium hexametaphosphate, sodium hexametasilicate, sodium cetylbenzenesulfonate, and polyethylene glycol. The experimental method of concrete catalyst immobilization is the same as embodiment 2.

[0072] Image 6 is the influence curve of the degradation of toluene by adding different dispersant immobilized catalysts. from Image 6 It can be seen that the addition of dispersant improves the effect of photocatalyst to a certain extent. From the perspective of comprehensive effects, sodium hexametap...

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PUM

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Abstract

The present invention provides a method for immobilization of titanium dioxide and application of the titanium dioxide, the method for immobilization of the titanium dioxide comprises the following steps: silica sol and a silane coupling agent are mixed evenly, adding titanium dioxide evenly, the quality of the two silicon oxide and titanium dioxide in silica sol ratio (0.6-2): 1; adding dispersant, mixing and stirring to obtain mixture, the mixture is sprayed carrier Aluminum Alloy online the pre treated, 150 to 170 DEG C under the condition of dry 0.5-5h, TiO2 catalyst supported by silica sol. The technical scheme of the invention, improves the catalyst supported firmness compared with the prior art, the photocatalytic effect of catalyst supported on the technical scheme of the invention has better, and the problem of cracks on the catalyst surface is solved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a method for immobilizing titanium dioxide and its application. Background technique [0002] Self-discovered TiO 2 Since the phenomenon of photocatalytic water splitting, TiO 2 Because of its excellent and stable photophysical and photochemical properties, it is widely used in the fields of materials, chemistry, and photocatalytic degradation. With the increasing development of the economy, people pay more and more attention to the problem of environmental pollution. The discovery of photocatalysis provides an important way to solve the problem of environmental pollution. The principle of photocatalysis is that when the photocatalyst is irradiated by light, when the energy of the photon is higher than the absorption threshold of the photocatalyst, the electrons of the semiconductor transition from the forbidden band to the rewinding band to form photogenerated electrons and ...

Claims

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Application Information

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IPC IPC(8): B01J21/06C02F1/30C02F101/32
CPCB01J21/063C02F1/30C02F2101/322C02F2305/10
Inventor 朱荣淑谭剑
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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