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A kind of preparation method of visible light catalytic composite film

A composite film, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, special compound water treatment, etc., can solve the problems that hinder the industrial application of photocatalytic degradation of pollutants, the difficulty of separation and recovery of titanium dioxide powder, and the photocatalytic effect is not outstanding. and other problems, to achieve the effect of improving the efficiency of catalytic degradation, reducing the cost of catalytic degradation, and increasing the ability of pollutants

Active Publication Date: 2021-10-19
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure TiO 2 Photocatalysts have the defects of high recombination rate of photogenerated electron-hole pairs, relatively low quantum efficiency, unremarkable photocatalytic effect and narrow spectral response range, and there is the problem of separation and recovery of titanium dioxide powder in use, which seriously hinders Industrial Application of Titanium Dioxide Photocatalytic Degradation of Pollutants

Method used

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  • A kind of preparation method of visible light catalytic composite film
  • A kind of preparation method of visible light catalytic composite film
  • A kind of preparation method of visible light catalytic composite film

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0055] One of the embodiments of the preparation method of a visible light catalytic composite film of the present invention comprises the following steps:

[0056] (1) Weigh 8g of titanium dioxide P25 and 6g of diatomaceous earth into a beaker, add 56g of absolute ethanol, and stir in a constant temperature water bath at 70°C for 0.5 hours.

[0057] (2) Weigh 0.5g of silane coupling agent KH540 and dissolve it in 0.5g of absolute ethanol, and add dropwise to the suspension obtained in step (1), the dropping rate is controlled at 1 drop / second, at 70°C After stirring in a constant temperature water bath for 2 hours, suction filtration, repeated washing with absolute ethanol and deionized water three times, and vacuum drying at a temperature of 60°C for 4 hours to obtain a coupling-modified diatomite / titanium dioxide inorganic powder.

[0058] (3) Weigh 8 g of diatomite / titanium dioxide inorganic powder modified by coupling, add it to 50 ml of ferric chloride solution with a su...

Embodiment 2

[0065] One of the embodiments of the preparation method of a visible light catalytic composite film of the present invention comprises the following steps:

[0066] (1) Weigh 10g of titanium dioxide P25 and 8g of diatomaceous earth into a beaker, add 72g of absolute ethanol, and stir in a constant temperature water bath at 70°C for 0.5 hours.

[0067] (2) Weigh 0.63g of silane coupling agent KH550 and dissolve it in 0.63g of absolute ethanol, and add dropwise to the suspension obtained in step (1), the dropping rate is controlled at 1 drop / second, at 70°C Stir in a constant temperature water bath for 2 hours, then filter with suction, rinse with absolute ethanol and deionized water three times, and dry in vacuum at a temperature of 70°C for 3.5 hours to obtain a coupling-modified diatomite / titanium dioxide inorganic powder.

[0068] (3) Weigh 8 g of diatomite / titanium dioxide inorganic powder modified by coupling, add it to 50 ml of ferric chloride solution with a substance am...

Embodiment 3

[0075] One of the embodiments of the preparation method of a visible light catalytic composite film of the present invention comprises the following steps:

[0076] (1) Weigh 11g of titanium dioxide P25 and 9g of diatomaceous earth into a beaker, add 80g of absolute ethanol, and stir in a constant temperature water bath at 70°C for 0.5 hours.

[0077] (2) Weigh 0.69g of silane coupling agent KH560 and dissolve it in 0.69g of absolute ethanol, and add dropwise to the suspension obtained in step (1), the dropping rate is controlled at 1 drop / second, at 70°C Stir in a constant temperature water bath for 2 hours, then filter with suction, rinse with absolute ethanol and deionized water three times, and dry in vacuum at a temperature of 75°C for 4 hours to obtain a coupling-modified diatomite / titanium dioxide inorganic powder.

[0078] (3) Weigh 8 g of diatomite / titanium dioxide inorganic powder modified by coupling, add it to 50 ml of ferric chloride solution with a substance amou...

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Abstract

The invention discloses a preparation method of a visible light catalyzed composite membrane. Titanium dioxide and diatomite are dispersed in absolute ethanol to obtain a suspension; a silane coupling agent is dissolved in ethanol and added to the suspension to obtain a suspension through coupling. Co-modified diatomite / titanium dioxide inorganic powder; when added to ferric chloride solution, Fe 3+ Modification-coupling modified diatomaceous earth / titanium dioxide inorganic powder; adding Fe to the polyurethane polymer solution 3+ Modification-Coupling-modified diatomite / titanium dioxide inorganic powder is stirred evenly, then calcium carbonate powder with a solid content of 10% is added, and stirred to obtain a coating solution; film is formed, and then soaked in 300mg / L xanthene dye After being in the solution for a certain period of time, a xanthene dye-sensitized diatomite / titanium dioxide composite film, that is, a visible light-catalyzed composite film is obtained. The composite film of the invention has the characteristics of high light utilization rate, high catalytic efficiency and good stability. It can be used to degrade water pollutants.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a method for preparing a visible light catalytic composite film. Background technique [0002] At present, photocatalytic degradation of pollutants has become an important research field. TiO 2 、WO 3 , ZnO, SnO 2 , CdS, FeO 3 etc. are commonly used n-type semiconductor photocatalyst materials, among which TiO 2 With its high chemical stability, resistance to light corrosion, not easy to dissolve, and deep valence band energy level, it can be used in TiO 2 On the surface, the acceleration of some endothermic chemical reactions, coupled with its non-toxicity and low cost, has become a green environmental management technology with great application prospects. [0003] Diatomite is a natural mineral with a light, porous structure whose main component is amorphous silica. It has a high specific surface area, good adsorption performance, stable chemical properties, non-to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J37/00B01J35/10C02F1/30C02F101/30
CPCC02F1/30B01J31/38B01J37/0018C02F2305/10C02F2101/308B01J35/61B01J35/657B01J35/39
Inventor 周虎王晓虹张少伟蹇建王桃芬左宇璐何楚娴
Owner HUNAN UNIV OF SCI & TECH