Supported titanium dioxide photocatalyst and preparation method thereof

A photocatalyst and load-type technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that the specific surface area cannot be effectively improved, affecting the treatment efficiency of photocatalysts, and unfavorable enrichment of organic molecules and other problems, to achieve the effect of increasing the chance of contact reaction, eliminating pollution, and high specific surface area

Active Publication Date: 2013-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, macroporous inorganic oxides generally have a lower specific surface area (generally 2 / g), and the specific surface area of ​​the heteropoly acid is usually 2 / g, after the combination of the two, the specific surface area cannot be effectively improved, and the photocatalyst with a lower specific surface area is not conducive to the enrichment of low-concentration organic molecules in sewage, thus affecting the improvement of photocatalyst treatment efficiency

Method used

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  • Supported titanium dioxide photocatalyst and preparation method thereof
  • Supported titanium dioxide photocatalyst and preparation method thereof
  • Supported titanium dioxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 takes monodisperse SiO 2 Microspheres

[0032] Pour a certain amount of ethyl orthosilicate into the Erlenmeyer flask containing the mixture of ammonia water and absolute ethanol at one time, wherein the concentration of ethyl orthosilicate is 0.45mol / L, and the concentration of ammonia water is 2.2mol / L . The reaction flask was placed in a constant temperature water bath at 25° C. with magnetic stirring, and the reaction was carried out for 10 hours. The particle size of the obtained silica is about 530m. Using absolute ethanol as a solvent, the reaction mother liquor is subjected to centrifugation-ultrasonic dispersion and repeatedly washed several times, and finally, the silicon dioxide microspheres are ultrasonically dispersed in absolute ethanol with a content of 5w% for further use.

[0033] In the same way, SiO with different diameters can be synthesized by changing the concentration of each reagent. 2 Microspheres. Some synthesis results are sho...

Embodiment 2

[0036] Embodiment 2 prepares monodisperse SiO with microemulsion method 2 Microspheres

[0037] The microemulsion system is composed of cetyltrimethylammonium chloride / cyclohexane / water. Add 11mL tetraethyl orthosilicate dropwise at 30°C at a rate of 0.2mL / min. After the dropwise addition, continue to stir for 1 hour, and then add concentrated ammonia water. Clear and transparent; after continuing to react for a certain period of time, the system appeared white turbidity again, indicating that the hydrolysis and condensation reaction of tetraethylorthosilicate began to proceed. The reactor was sealed and stirring was continued for 10 hours. The obtained silica microspheres were about 40 in diameter. After the reaction mother liquor is flocculated with acetone, it is washed several times by centrifugation-ultrasonic dispersion with absolute ethanol as a solvent, and finally, the silicon dioxide microspheres are ultrasonically dispersed in absolute ethanol with a content of 5...

Embodiment 3

[0041] Example 3 SiO 2 Assembly of templates

[0042] SiO 2 Template assembly and sintering treatment. 1) When assembling by gravity deposition method, measure 30mL SiO 2 The microsphere suspension was placed in a 40mL flat-bottomed sedimentation tank and naturally settled at room temperature. The deposition should be carried out on a stable experimental bench, while avoiding excessive noise, so as to prevent external factors such as vibration and sound from disturbing the sedimentation process of the microspheres. When white SiO 2 When the liquid layer basically drops to the bottom of the sedimentation tank, use a syringe to draw out the upper layer to clear the night, then seal the opening of the sedimentation tank with a plastic film, pierce a few small holes on the film, and let it stand and dry for 10 days at room temperature to obtain a large area with a thickness of about 1mm. SiO 2 colloidal crystals. 2) When assembled by centrifugation, measure 20mL SiO 2 The ...

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Abstract

The invention discloses a supported titanium dioxide photocatalyst taking ordered macroporous carbon as a carrier, and a preparation method thereof. The TiO2 content of the catalyst is 5 to 70 weight percent; and the average pore diameter of the catalyst is between 30 and 900nm, and the specific surface area of the catalyst is between 400 and 1,500m2 / g. The preparation method for the catalyst comprises the following steps: assembling a TiO2 template; filling a carbon precursor into gaps of the template, performing high-temperature carbonization, removing the template, and preparing the ordered macroporous carbon; and loading a TiO2 precursor onto the ordered macroporous carbon in a form of sol or suspension, and roasting to prepare the catalyst. The catalyst has high specific surface area and a three-dimensionally run-through porous channel structure with large size, and is particularly suitable for photocatalytic degradation treatment on macromolecular organic pollutants.

Description

technical field [0001] The invention relates to a supported titanium dioxide (TiO 2 ) The preparation method of photocatalyst, specifically, relates to a kind of TiO with ordered macroporous carbon as carrier 2 A photocatalyst and a preparation method thereof belong to the field of inorganic material preparation. 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 that 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. Therefore, eliminating organic pollutants in water and improving environmental conditions are major issues that human...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/06C02F1/30
Inventor 杨卫亚沈智奇凌凤香张喜文王丽华
Owner CHINA PETROLEUM & CHEM CORP
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