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Method for preparing peroxo-titanic acid photocatalytic coating agent

A technology of peroxotitanic acid light and coating agent, which is applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., which can solve the problems of increased raw material costs, complicated application processes, and environmental pollution, and achieve cost reduction , the effect of low heat treatment temperature

Inactive Publication Date: 2006-02-15
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 Ti 4+ )TiOSO 4 ·NH 2 O, add 200ml of deionized water solution, let it stand for 8h until the raw material is completely dissolved, and then suction and filter to remove impurities into a clear solution. Take a 500ml beaker, add 200ml of deionized water to adjust the pH to 8, then add TiOSO 4 The clear solution and 3mol / L ammonia water are titrated in a beaker together, stirring constantly to make the reactants evenly mixed, keeping the pH of the reaction solution at about 8 during the reaction process, and the white precipitate obtained after the titration is stirred and aged for 25min. Then solid-liquid separation, vacuum filtration is used, and the white precipitate obtained is washed with deionized water to remove NH 4 + And SO 4 2- , And repeat washing 3 times. Dilute the precipitate after washing and filtration to 0.1mol / L to become a white precipitate suspension; select 30% H 2 O 2 The solution is used as a peptizer and 50ml is added d...

Embodiment 2

[0011] Weigh 128.4g (containing 0.4mol Ti 4+ )TiOSO 4 ·NH 2 O, add 200ml of deionized water solution, let stand for 10h until the raw material is completely dissolved, and then suction filtration to remove impurities to become a clear solution. Take a 500ml beaker, add 200ml deionized water to adjust the pH to 7.5, and add TiOSO 4 The clear solution and 3mol / L ammonia water were titrated in a beaker together, stirring constantly to make the reactants evenly mixed, keeping the pH of the reaction solution at 7.5 during the reaction, and the white precipitate obtained after the titration was stirred and aged for 30 minutes. Then solid-liquid separation, centrifugal separation is used, and the white precipitate obtained is washed with deionized water to remove NH 4 + And SO 4 2- , And repeat washing 4 times. Dilute the precipitate after washing and filtration to 0.05mol / L to become a white precipitate suspension; select 30% H 2 O 2 170ml of the solution is used as a peptizer, and it...

Embodiment 3

[0013] First, add 103.8 grams of TiOSO to the beaker 4 ·NH 2 O (according to the purity contains 0.3mol Ti 4+ ), add 200ml of deionized aqueous solution, let stand for 12h until the raw material is completely dissolved, and then suction filter the solution to remove impurities to become a clear solution. Take an appropriate amount of deionized water, adjust to a certain pH at 9 as the base solution, and mix the above TiOSO 4 Clear solution and 3mol / L ammonia (NH 3 ·H 2 O) The two solutions are titrated in the bottom solution together, while stirring continuously to make the precipitation reactants evenly mixed, and the titration rate of the two is controlled to maintain the pH at 9, and the precipitation suspension obtained after the titration is completed, continue to stir and age for 30 minutes. Then solid-liquid separation, vacuum filtration is used, and the white precipitate obtained is washed with deionized water to remove NH 4 + And SO 4 2- , And repeat washing 5 times. Di...

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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 method for preparing a photocatalytic coating agent, and more specifically to a method for preparing a peroxytitanic acid photocatalytic coating agent by using an inorganic salt precipitation-peptizing method. Background technique [0002] The commonly used supported titanium oxide photocatalysts are generally supported on the substrate by powder bonding or sol-gel technology; the latter uses expensive alkoxides and general inorganic salts as raw materials, and contains a large amount of organic solvents Or complexing agent, and the acidity of the sol is strong, and the metal substrate is restricted; the prepared adhesive coating and sol film require a higher heat treatment temperature, the thermal decomposition of organic matter pollutes the environment, and the cost of raw materials is increased. More complicated. The currently used titanium oxide photocatalyst contains a large amount of organic solvents,...

Claims

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Application Information

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