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Process for preparing photocatalytic TiO2 film used to clean water and air

A photocatalytic thin film and titanium dioxide technology, applied in the field of photocatalysis, can solve the problems of high one-time investment and operating costs, difficulty in large-scale promotion and application, low catalyst activity, etc., to achieve easy oxidation and removal, good photocatalytic degradation, and maintenance no change in activity

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
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Problems solved by technology

Although the former has high activity, it is difficult to separate the fine semiconductor powder from the effluent water, which makes the one-time investment and operating costs very high, making it difficult to apply on a large scale.
In contrast, the supported catalyst has better practicability, but once the catalyst is immobilized, its adsorption performance will be greatly reduced, making the catalyst less active and less stable.
This defect is even more pronounced for thin-film immobilized catalysts based on flat plates, where mass transfer limitations often occur in photocatalytic reactions.

Method used

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  • Process for preparing photocatalytic TiO2 film used to clean water and air
  • Process for preparing photocatalytic TiO2 film used to clean water and air

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Embodiment Construction

[0011] figure 1 Shown is the flow chart of the preparation of titania photocatalyst. The coating solution and substrate treatment can be carried out at the same time, and the finished product can be obtained after leaching coating, drying at room temperature, and repeated firing several times. For example, add 23.5mg of carbon black, 10ml of tetrabutyl titanate and 3ml of acetylacetone to 70ml of n-propanol in sequence, slowly add 4ml of deionized water dropwise after the liquid is evenly mixed, and disperse with ultrasonic wave for 10-20min to make the carbon black Disperse evenly, and keep it clean for more than 12 hours to prepare the coating solution for the catalyst; if the aluminum plate metal substrate is selected, it will be used as the substrate for catalyst coating after sanding, cleaning, and drying; the coating solution should be cleaned before each use Ultrasonic dispersion for 10 to 20 minutes, then soak the pretreated substrate in the coating solution, pull at ...

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Abstract

A photocatalytic TiO2 film for cleaning water and air is prepared through dissolving the titanium alkoxiode in alcohol solvent, adding water and carbon black to obtain slurry, dipping substrate in it, and gradient calcining several times. It has high catalytic degradation rate to organic pollutant (83-93%).

Description

technical field [0001] The invention belongs to the technical scope of photocatalysis, and in particular relates to a preparation method of a titanium dioxide photocatalytic film which can be used for water and air purification and removes organic pollutants in the environment. Background technique [0002] Photocatalytic technology is the use of ultraviolet light to irradiate semiconductor materials with photocatalytic activity. Due to its photogenerated holes and the formation of hydroxyl radicals after being captured, it has a strong oxidizing ability and can oxidize and mineralize almost all organic pollutants. In recent years, with people's attention to trace organic pollutants that are difficult to degrade in different environmental media and the concept of persistent organic pollutants and endocrine disruptors, photocatalytic oxidation technology has attracted more attention due to its ability to directly use sunlight . The preparation of semiconductor materials use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32B01J21/06B01J35/00B01J37/02C23C14/08
Inventor 张彭义陈中颖余刚蒋展鹏祝万鹏
Owner TSINGHUA UNIV
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