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Low-temperature prepn process of self-cleaning nano Tio2 glass

A nano-titanium dioxide, self-cleaning technology, applied in the chemical industry, can solve the problems of expensive equipment, necessary vacuum system, restricting the practical process of nano-TiO2 thin film materials, etc., to achieve the effect of simple equipment, small investment and good photocatalytic performance

Inactive Publication Date: 2003-05-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, physical methods such as DC reactive magnetron sputtering are used to deposit TiO 2 Thin-film glass has good transparency, strong photocatalytic performance and photo-induced superhydrophilicity. The film is uniform and the thickness can be controlled. However, a vacuum system is required, and the equipment is expensive. In addition, the sputtering rate is also a major bottleneck restricting its development. The film prepared by the sol-gel method has the advantages of high purity and easy control of reaction conditions, but it needs to be baked at a higher temperature; and the chemical vapor deposition method has certain difficulties in preparing large-area films.
It is precisely because of various limitations in various film-making methods and means that severely restrict the development of nano-TiO 2 Practical progress of thin film materials

Method used

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  • Low-temperature prepn process of self-cleaning nano Tio2 glass

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: with 9.2ml anatase type TiO 2 Colloid, 3ml water-soluble silica sol and 47.8ml deionized water are mixed and stirred evenly; put the cleaned glass substrate prepared in advance into the colloid vertically, then pull it up at a uniform speed, place it in a clean environment, and place it in the Dry and solidify at room temperature or cool naturally after treatment at 300°C or less. The self-cleaning glass thus prepared has a wavelength of 254nm and an optical power density of 200μW / cm 2 After 40 minutes of exposure to high-grade ultraviolet light, the contact angle dropped from 54° to less than 1°, close to 0°, which has obvious anti-fog function.

Embodiment 2

[0020] Example 2: After mixing 4ml of tetraethyl orthosilicate and 50ml of absolute ethanol (≥99.7%) and stirring for 4 hours, add a mixture of deionized water (4ml) and HCl (0.12ml) and stir for 2 hours; Then anatase TiO diluted with absolute ethanol (50ml) 2 Colloid (20ml) was added therein and mixed evenly with a sonicator. Put the pre-prepared clean glass substrate into it, and pull it up vertically at a constant speed, and place it in a clean environment to dry and cure naturally or cool it naturally after processing at 300°C or less. The self-cleaning glass thus prepared has a wavelength of 254nm and an optical power density of 160μW / cm 2 After 40 minutes of exposure to ultraviolet light, the contact angle to water dropped from 13° to below 1°.

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Abstract

The present invention relates to a low temperature treating process of self-cleaning TiO2 nanoglass. By using silica and anatase type nanosol as basic components and through pulling process, film is formed on the surface of glass plate. The film is dried at room temperature and cured or treated at temperature below 300 deg.c and cooled naturally. The prepared self-cleaned glass has excellent photocatalytic property, superhydrophilic property, high and homogeneous transparency. The said process is simple, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing nano-titanium dioxide self-cleaning glass at low temperature. Background technique [0002] Since the discovery in 1972 that nanoscale titanium dioxide can decompose water into hydrogen and oxygen under the irradiation of ultraviolet light, titanium dioxide has been widely valued in the material field. In nano-semiconductor materials, anatase TiO 2 It has received great attention for its high photocatalytic efficiency, good stability, non-toxic and harmless. Not only that, with anatase TiO 2 The prepared film also has photoinduced superhydrophilic properties, which further expands its practical use. Anatase TiO 2 The prepared film can not only be used for degradation of organic matter, sterilization and disinfection, sewage treatment, air purification, etc., such as green photocatalytic materials such as self-cleaning glass, steril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/00C03C17/22C03C17/30
Inventor 任达森崔晓莉沃松涛杨锡良章壮健
Owner FUDAN UNIV
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