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Method for preparing peroxo-titanic acid photocatalytic coating agent

A peroxotitanic acid light and coating agent technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as increased raw material costs, complex application processes, and environmental pollution, and achieve Effects of cost reduction and low heat treatment temperature

Inactive Publication Date: 2007-06-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The commonly used supported titanium oxide photocatalysts are usually loaded onto the substrate by powder bonding or sol-gel technology; the latter uses expensive alkoxides and general inorganic salts, which contain a large amount of organic solvents or complexing agent, and the acidity of the sol is strong, and the metal substrate is limited; the prepared adhesive coating and sol film need a higher heat treatment temperature, the thermal decomposition of organic matter pollutes the environment, and increases the cost of raw materials. more complex
Titanium oxide-based photocatalysts currently used contain a large amount of organic solvents, which require high heat treatment temperatures, organic matter volatilizes and pollutes the environment, has low efficiency and high cost; The range is small, which affects the application and promotion of photocatalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Weigh 34.6g (containing 0.1mol of Ti 4+ )TiOSO 4 ·nH 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 500ml beaker, add 200ml deionized water to adjust the pH to 8, and put 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 25 minutes with stirring. Then the solid-liquid was separated, and the obtained white precipitate was washed with deionized water to remove NH by suction filtration under reduced pressure. 4 + and SO 4 2- , and repeat the wash 3 times. 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 u...

Embodiment 2

[0011] Weigh 128.4g (containing 0.4mol of Ti 4+ )TiOSO 4 ·nH 2 O, add 200ml of deionized aqueous solution, set aside for 10h until the raw material is completely dissolved, carry out suction filtration to remove impurities and become a clear solution. Take a 500ml beaker, add 200ml deionized water to adjust the pH to 7.5, and put 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 7.5 during the reaction, and age the white precipitate obtained after the titration for 30min with stirring. Then solid-liquid separation, using centrifugation, the obtained white precipitate was washed with deionized water to remove NH 4 + and SO 4 2- , and repeat the wash 4 times. Dilute the precipitate after washing and suction filtration to 0.05mol / L to become a white precipitate suspension; choose 30% H 2 o 2 The solution is used as peptizer 170ml, and it is added dro...

Embodiment 3

[0013] First in a beaker, add 103.8 grams of TiOSO 4 ·nH 2 O (according to the purity contains 0.3mol Ti 4+ ), add 200ml of deionized aqueous solution, let it stand for 12h until the raw material is completely dissolved, and then carry out suction filtration to remove impurities to become a clear solution. Take an appropriate amount of deionized water, adjust it to a certain pH at 9 as the base solution, and mix the above TiOSO 4 clear solution and 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom liquid, while stirring continuously to make the precipitation reactants mix uniformly, and the dropping speed of the two is controlled to keep the pH at 9, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 min. Then the solid-liquid was separated, and the obtained white precipitate was washed with deionized water to remove NH by suction filtration under reduced pressure. 4 + and ...

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PUM

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Abstract

The invention discloses a method for peroxy titanic acid with visible-light activity for supported photocatalyst. Wherein, preparing clear solution with given concentration by TiSO4 to drip with diluted ammonia into deionized water with given pH value as basic solution; mixing and holding given pH value to form precursor deposition of titanium oxide; continuing to mix for some time; taking solid-liquid separation to the suspending liquid to clean for 3-5 times, dripping some H2O2 peptizer to deposite and obtain the product. The film coating can crystallize and form anatase phase at 150Deg. The membrane layer particle is 10-20 nano sphere or ~20X~100 nano column.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic coating agent, in particular to a method for preparing a peroxotitanic acid photocatalytic coating agent by utilizing an inorganic salt precipitation-peptization method. Background technique [0002] The commonly used supported titanium oxide photocatalysts are usually loaded onto the substrate by powder bonding or sol-gel technology; the latter uses expensive alkoxides and general inorganic salts, which contain a large amount of organic solvents or complexing agent, and the acidity of the sol is strong, and the metal substrate is limited; the prepared adhesive coating and sol film need a higher heat treatment temperature, the thermal decomposition of organic matter pollutes the environment, and increases the cost of raw materials. more complicated. Titanium oxide-based photocatalysts currently used contain a large amount of organic solvents, which require high heat treatment temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/02C09D1/00B05D7/14B05D5/06
Inventor 徐明霞戈磊田玉明
Owner TIANJIN UNIV
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