Simple preparation method of coating photocatalyst containing titanium dioxide nano-crystal grains

A nano-crystal, titanium dioxide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as application construction difficulties, complex processes, etc., and achieve cost reduction, high visible light activity, and fresh smell. Effect

Inactive Publication Date: 2009-10-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the prior art that the process is complicated, and it is difficult to apply and construct the living room, taxi cab, etc. that are not convenient for heat treatment, and to provide a further simplified process equipment and operation techn

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 34.6g (containing 0.1mol of Ti 4+ )TiOSO 4 2H 2 O, add 200ml of deionized aqueous solution, let it stand for 8h until the raw material is completely dissolved, carry out suction filtration to remove impurities and become a clear solution. Take a 1000ml beaker, add 200ml deionized water to adjust the pH to 8, and make TiOSO 4 Titrate the clarified solution and 3mol / L ammonia water together in a beaker, stir continuously to mix the reactants evenly, keep the pH of the reaction solution at about 8 during the reaction, and age the white precipitate obtained after the titration for 30min with stirring. Then the solid-liquid was separated, and the obtained white precipitate was repeatedly washed 3 times with deionized water to remove NH 4 + and SO 4 2- . Dilute the precipitate after washing and suction filtration to 0.1mol / L to become a white precipitate suspension; choose 30% H 2 o 2 The solution is used as peptizer 45ml, and it is added dropwise to the suspen...

Embodiment 2

[0018] Weigh 34.6g (containing 0.1mol of Ti 4+ )TiOSO 4 2H 2 O, add 200ml of deionized aqueous solution, let it stand for 8h until the raw material is completely dissolved, carry out suction filtration to remove impurities and become a clear solution. Take a 1000ml beaker, add 200ml deionized water to adjust the pH to 8.5, and add TiOSO 4 Titrate the clarified solution and 3mol / L ammonia water together in a beaker, stir continuously to mix the reactants evenly, keep the pH of the reaction solution at about 8.5 during the reaction, and age the white precipitate obtained after the titration for 30min with stirring. Then the solid-liquid was separated, and the obtained white precipitate was repeatedly washed 3 times with deionized water to remove NH 4 + and SO 4 2- . Dilute the precipitate after washing and suction filtration to 0.1mol / L to become a white precipitate suspension; choose 30% H 2 o 2 The solution is used as peptizer 55ml, and it is added dropwise to the sus...

Embodiment 3

[0021] Weigh 34.6g (containing 0.1mol of Ti 4+ )TiOSO 4 2H 2 O, add 200ml of deionized aqueous solution, let it stand for 8h until the raw material is completely dissolved, carry out suction filtration to remove impurities and become a clear solution. Take a 1000ml beaker, add 200ml deionized water to adjust the pH to 8, and make TiOSO 4 Titrate the clarified solution and 3mol / L ammonia water together in a beaker, stir continuously to mix the reactants evenly, keep the pH of the reaction solution at about 8 during the reaction, and age the white precipitate obtained after the titration for 30min with stirring. Then the solid-liquid was separated, and the obtained white precipitate was repeatedly washed 3 times with deionized water to remove NH 4 + and SO 4 2- . Dilute the precipitate after washing and suction filtration to 0.1mol / L to become a white precipitate suspension; choose 30% H 2 o 2 The solution is used as peptizer 50ml, and it is added dropwise to the suspen...

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Abstract

The invention discloses a simple preparation method of a coating photocatalyst containing titanium dioxide nano-crystal grains. The method comprises the following steps: preparing TiOSO4.2H2O into clear solution; taking deionized water as base solution; titrating TiOSO4 settled solution and 3mol/L ammonia into the base solution, keeping pH in the range from 8 to 9 to obtain precipitate suspension; stirring and aging for 30min; washing with the deionized water for 3-5 times to eliminate NH4 and SO4; separating solid from liquid; diluting precipitate to 0.05-0.2mol/L; selecting H2O2 solution as a peptizing agent, dropping the peptizing agent into the suspension with the Ti/H2O2 mol ratio of 1:4-6, and stirring; standing the reaction solution for 24h; processing the reaction solution by hot water of 93-100 DEG C for 4-10h, cooling to the room temperature to obtain coating titanium dioxide photocatalyst containing nano-crystal grains and having higher visible light activity. The method is realized by a normal-pressure low-temperature water processing and aging technology, and the obtained photocatalyst is free from organic solvent, has low cost, substantially neutral spraying agent and strong adhesion on a plurality of base materials.

Description

technical field [0001] The invention relates to a spray-coated photocatalyst, in particular to a method for preparing a coated photocatalyst containing nanometer TiO2 anatase crystal particles by using complexation and peptization of inorganic salts. Background technique [0002] The commonly used supported titanium oxide-based photocatalysts are usually loaded onto the substrate by powder bonding method or sol-gel technology. Pollution of the environment; the raw materials used in sol-gel technology are alkoxides and inorganic salts TiCl 4 , the alkoxide is expensive, contains a large amount of organic solvent or complexing agent, and the acidity of the sol is strong, and the metal substrate is limited; although TiCl 4 The cost of raw materials is reduced, but due to the TiCl 4 It is easy to absorb moisture in the air, hydrolyze and emit acidic smoke, polluting the working environment; in addition, the visible light catalysis is not very high (generally 8 hours of light, ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/02
Inventor 徐明霞梁辉季惠明李晓雷
Owner TIANJIN UNIV
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