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Cavity core-shell structured TiO2/WO3 composite photocatalyst and preparation method therefor and application thereof

A core-shell structure and catalyst technology, which is applied in the field of preparing hollow core-shell structure TiO2/WO3 composite photocatalysts, can solve the problems of complicated procedures and complicated methods, and achieve strong photocatalytic oxidation, high separation efficiency and controllability strong effect

Active Publication Date: 2015-12-16
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method used to prepare composite photocatalysts with core-shell structure is generally more complicated, and most of them are prepared by two-step method. First, one catalyst is prepared, and then the second catalyst is attached by impregnation, photoelectric deposition and other methods. The cavity structure is generally passed through the template. Obtained by combining etching technology, the procedure is relatively cumbersome

Method used

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  • Cavity core-shell structured TiO2/WO3 composite photocatalyst and preparation method therefor and application thereof
  • Cavity core-shell structured TiO2/WO3 composite photocatalyst and preparation method therefor and application thereof
  • Cavity core-shell structured TiO2/WO3 composite photocatalyst and preparation method therefor and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Under water bath conditions, 140uL (1.27mmol) of titanium tetrachloride was added to 20mL of tert-butanol and 20mL of ethylene glycol, and vigorously stirred until titanium tetrachloride was completely dissolved to form a transparent solution. 1.0g of tungsten hexachloride (2.52 mmol) was dissolved in 50mL of absolute ethanol, and then the above mixed solution was transferred to a 100mL polytetrafluoroethylene kettle (accounting for about 90% of the kettle volume), kept at 160°C for 48h, cooled to room temperature naturally, and centrifuged to prepare Hollow core-shell structure TiO 2 / WO 3 composite photocatalyst.

[0025] Test results: The morphology of the prepared catalyst is a core-shell structure with a cavity, and a needle-like structure with small particles growing on the spherical outer surface. The particle size of the core-shell ball is about 1-2um, the diameter of the cavity is about 200nm, and the specific surface of the catalyst is about 189m 2 / g, the m...

Embodiment 2

[0027] Under water bath conditions, add 140uL (1.27mmol) of titanium tetrachloride to 30mL of tert-butanol and 10mL of ethylene glycol, stir vigorously until titanium tetrachloride is completely dissolved to form a transparent solution, and 1.0g of tungsten hexachloride (2.52 mmol) was dissolved in 50mL of absolute ethanol, and then the above mixed solution was transferred to a 100mL polytetrafluoroethylene kettle (accounting for about 90% of the kettle volume), kept at 160°C for 48h, cooled to room temperature naturally, and centrifuged to prepare Hollow core-shell structure TiO 2 / WO 3 composite photocatalyst.

[0028] Test results: Through SEM and TEM spectrum tests, it is found that the morphology of the catalyst is a core-shell structure with a cavity, and a needle-like structure with small particles growing on the spherical outer surface. The particle size of the core-shell ball is about 1-2um, and the diameter of the cavity is about 200nm. , the specific surface area ...

Embodiment 3

[0030] Under water bath conditions, add 280uL (2.54mmol) of titanium tetrachloride to 30mL of tert-butanol and 10mL of ethylene glycol, stir vigorously until titanium tetrachloride is completely dissolved to form a transparent solution, and 0.5g of tungsten hexachloride (1.26 mmol) was dissolved in 50mL of absolute ethanol, and then the above mixed solution was transferred to a 100mL polytetrafluoroethylene kettle (accounting for about 90% of the kettle volume), kept at 160°C for 48h, cooled to room temperature naturally, and centrifuged to prepare Hollow core-shell structure TiO 2 / WO 3 composite photocatalyst.

[0031] Test results: Observed by a scanning electron microscope (SEM), the catalyst is a spherical structure with a core-shell, with small particles attached to the outer surface, and the specific surface area of ​​the catalyst is about 165m 2 / g The needle-like structure disappears.

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Abstract

The invention relates to a preparation method for a cavity core-shell structured TiO2 / WO3 composite photocatalyst. The preparation method comprises the following steps: (1) dissolving TiCl4 in a mixed alcohol solution so as to obtain a solution A; dissolving WCl6 in ethanol so as to obtain a solution B; and then mixing the solution A and the solution B so as to prepare a raw material solution; and (2) transferring the raw material solution into a polytetrafluoroethylene lined hydrothermal kettle, controlling reaction temperature and time, and carrying out centrifuge washing, thereby preparing the cavity core-shell structured TiO2 / WO3 composite photocatalyst. According to the preparation method, the cavity core-shell structured TiO2 / WO3 composite photocatalyst can be prepared through changing ingredients of the raw material solution, solvothermal time and temperature based on a solvothermal method. According to the preparation method, the cavity core-shell structured TiO2 / WO3 composite photocatalyst is prepared by adopting a one-pot method; and the preparation method does not need a hard template agent, is simple and convenient and is high in controllability. The TiO2 / WO3 can be applied to the photocatalytic degradation of indoor pollutant acetaldehyde.

Description

technical field [0001] The present invention belongs to TiO 2 / WO 3 The technical field of composite photocatalytic materials, in particular to a kind of preparation of hollow core-shell structure TiO by one-pot method 2 / WO 3 Method for composite photocatalysts. Background technique [0002] In recent years, the problem of environmental pollution has become particularly prominent around the world. Outdoors, PM2.5, which is mainly caused by combustion residues from daily power generation, industrial production, and vehicle exhaust emissions, has become more and more serious. Indoors, the pollution caused by continuous house purchase and decoration is also very severe. The decoration materials are nothing more than artificial boards, sandwich panels, glue, paint, coatings, adhesives, granite, marble, ceramic tiles and gypsum. Contains more or less four pollutants such as formaldehyde, benzene, ammonia and radon, and there is no such thing as a zero-pollution decoration ma...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/10B01D53/86B01D53/72
Inventor 朱建李丹孙兆毅陆景鹏李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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