Methods for preparing and applying titanium dioxide-carbon composite photocatalyst

A titanium dioxide and photocatalyst technology, which is applied in the field of photocatalytic materials, can solve the problems of easy agglomeration, high recombination rate of photogenerated carriers, difficult separation, etc., and achieves the effects of not harsh process conditions, simple preparation process, and improved utilization.

Inactive Publication Date: 2012-07-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But as a good photocatalyst, TiO 2 There are some defects: (1) The band gap is wide, it can only absorb ultraviolet light, it has no response in the visible light range, and the utilization rate of sunlight is low (about 3~5%); (2) The recombination rate of photogenerated carriers is high, Photocatalytic efficiency is low
(3) Due to TiO 2 Its own hydrophilicity is very strong, and the ultrafine TiO 2 The powder is very easy to agglomerate. Therefore, it is difficult to separate from the water phase after directly using a nano-powder photocatalyst similar to titanium dioxide to treat wastewater, resulting in new and more difficult-to-handle secondary pollution.
[0005] Although the TiO 2 Carrying on the above...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Add 20mL of tetrabutyl silicate to 10mL of absolute ethanol at room temperature, stir for 30min to obtain a uniform and transparent solution①;

[0038] (2) Mix 10mL of absolute ethanol, 45mL of ammonia water, 160mL of distilled water, and 2.2g of aluminum trichloride at room temperature, then fully stir and dissolve to form a solution②;

[0039] (3) Under the conditions of magnetic stirring and constant temperature 25°C water bath, slowly add solution ① to solution ②, and continue to stir for 2 hours after the addition is complete;

[0040] (4) After the reaction is complete, centrifuge the obtained product, discard the supernatant, and continue to wash the precipitate with absolute ethanol until it is neutralized, dry it under constant temperature vacuum drying conditions, and then carbonize at 520°C for 4.5 hours. Get SiO 2 / Al particles;

[0041] (5) Mix 20mL deionized water, 25mL tetrabutyl silicate, 6.0g SiO 2 / Al, 2.2g resorcinol, 10.0g sucrose, reacted for...

Embodiment 2

[0043] (1) Add 30mL tetrabutyl silicate to 15mL absolute ethanol at room temperature, stir for 40min to obtain a uniform and transparent solution①;

[0044] (2) Mix 15mL of absolute ethanol, 65mL of ammonia water, 240mL of distilled water, and 3.2g of aluminum trichloride at room temperature, then fully stir and dissolve to form a solution②;

[0045] (3) Under the conditions of magnetic stirring and constant temperature 30°C water bath, slowly add solution ① to solution ②, and continue to stir for 2.5 hours after the addition;

[0046] (4) After the reaction is complete, centrifuge the obtained product, discard the supernatant, and continue to wash the precipitate with absolute ethanol until it is neutral, dry it under constant temperature vacuum drying conditions, and then carbonize it at 580°C for 5.5 hours. Get SiO 2 / Al particles;

[0047] (5) Mix 40mL deionized water, 40mL tetrabutyl silicate, 10.0g SiO 2 / Al, 3.4g resorcinol, 15.0g sucrose, reacted for 4 hours under m...

Embodiment 3

[0049] (1) At room temperature: add 25mL of tetrabutyl silicate to 12mL of absolute ethanol, stir for 30min, and obtain a uniform and transparent solution①;

[0050] (2) Mix 12mL of absolute ethanol, 55mL of ammonia water, 200mL of distilled water, and 2.8g of aluminum trichloride in a three-necked flask at room temperature, stir and dissolve to form a solution②;

[0051] (3) Under the conditions of magnetic stirring and a water bath with a constant temperature of 25°C, slowly add the solution ① to the solution ② dropwise, and continue to stir for 2 hours after the dropwise addition;

[0052] (4) After the reaction is completed, centrifuge the obtained product, discard the supernatant, and continue to wash the precipitate with absolute ethanol until it is neutral, then place it in a constant temperature vacuum drying oven, and dry it at 80°C for 12 hours. High-temperature carbonization in a muffle furnace at 550°C for 5 hours to obtain SiO 2 / Al particles;

[0053] (5) Use 2...

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Abstract

The invention relates to methods for preparing and applying a titanium dioxide-carbon composite photocatalyst. The technical scheme is that the method for preparing the titanium dioxide-carbon composite photocatalyst comprises the following steps of: preparing an ordered macroporous-mesoporous carbon material and TiO2 sol respectively, soaking the aged TiO2 sol on the prepared macroporous-mesoporous carbon material by an impregnation method, drying, raising the temperature and calcicining to obtain a TiO2/C composite photocatalyst material. The method for applying the titanium dioxide-carbon composite photocatalyst is that photocatalytic reaction conditions are that: the adding amount of the titanium dioxide-carbon composite photocatalyst is 1 to 6g/L; a light source is an ultraviolet or visible light source and directly irradiates a solution, the depth of the solution is 0.4 to 0.6cm, and the exposure dose per unit area on the surface of the solution is 12.5 to 12.8mW/cm<2>; and the temperature of a solution system is kept at 20 to 40 DEG C, and air is continuously introduced to maintain the concentration of dissolved oxygen. Macroporous-mesoporous carbon material supported titanium dioxide is used as a photocatalyst, so that TiO2 has high dispersity and photocatalytic activity, and is easier to recycle.

Description

technical field [0001] The invention belongs to a photocatalytic material and its preparation method and application, in particular to a preparation method and application of a titanium dioxide catalyst with high photocatalytic activity for removing organic pollutants in water. Background technique [0002] With the rapid development of industrial production, a large amount of waste is continuously discharged into nature, which makes the living environment of human beings worse and worse, and the problem of water environment pollution is particularly serious. Wastewater contains a large number of organic pollutants, many of which are difficult to biodegrade, such as phenols, polychlorinated biphenyls and polycyclic aromatic hydrocarbons. Their biological toxicity is relatively high, which seriously threatens human health and life. Dye wastewater occupies a considerable proportion of various wastewater to be treated. Dye wastewater has deep chroma, high concentration, and hig...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/30C02F1/32C02F101/30
Inventor 郑经堂隋吴彬杨哲吴明铂李石曲险峰于维钊李峰张玉贞刘倩江波赵玉翠刘颖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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