Core-shell TiO2-BiOCl heterojunction photocatalyst with large specific surface area and preparation method thereof

A technology with large specific surface area and photocatalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of complex process, small specific surface area of ​​materials, and high preparation cost, and achieve a simple method and process. Effect

Inactive Publication Date: 2012-09-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multi-step preparation method has disadvantages such as complex process, high preparation cost, small material specific surface area, and uncontrollable shape.

Method used

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  • Core-shell TiO2-BiOCl heterojunction photocatalyst with large specific surface area and preparation method thereof
  • Core-shell TiO2-BiOCl heterojunction photocatalyst with large specific surface area and preparation method thereof
  • Core-shell TiO2-BiOCl heterojunction photocatalyst with large specific surface area and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 5mL glycerol and add in 25mL ethanol solution, and after stirring evenly, add 3.37g Bi(NO 3 ) 3 ·5H 2 O, then stirred until clear. Place the solution in an ice-water bath system and add 0.6mL TiCl 4 , stirred until clarified and put into a 50mL hydrothermal kettle at 110°C, kept for 72h and then cooled to room temperature naturally. After centrifugation and washing with deionized water and ethanol three times each, vacuum drying at 80 °C for 12 h yielded a large specific surface area core-shell TiO 2 -BiOCl heterojunction photocatalyst.

Embodiment 2

[0026] Take 10mL of glycerol and add it into 20mL of ethanol solution, and after stirring evenly, add 3.37g of Bi(NO 3 ) 3 ·5H 2 O, then stirred until clear. Place the solution in an ice-water bath system and add 0.6mL TiCl 4 , stirred until clarified and put into a 50mL hydrothermal kettle, kept at 180°C for 12 hours, and then naturally cooled to room temperature. After centrifugation and washing with deionized water and ethanol three times each, vacuum drying at 80 °C for 12 h yielded a large specific surface area core-shell TiO 2 -BiOCl heterojunction photocatalyst.

Embodiment 3

[0028] Take 10mL of glycerol and add it into 20mL of ethanol solution, and after stirring evenly, add 3.37g of Bi(NO 3 ) 3 ·5H 2 O, then stirred until clear. Place the solution in an ice-water bath system and add 0.4mL TiCl 4 , stirred until clarified and charged into 50mL in a 150°C hydrothermal kettle for 36h, then cooled naturally to room temperature. After centrifugation and washing with deionized water and ethanol three times each, vacuum drying at 80 °C for 12 h yielded a large specific surface area core-shell TiO 2 -BiOCl heterojunction photocatalyst.

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Abstract

The invention discloses a core-shell TiO2-BiOCl heterojunction photocatalyst with a large specific surface area and a preparation method thereof. The photocatalyst is prepared by taking an ethanol and glycerol system as a solvent and titanium tetrachloride as a titanium source through a hydrothermal one-step method, and has the specific surface area of 202.8 to 223.5m<2>/g, the pore volume of 0.120 to 0.156m<3>/g and the pore size of 1.64 to 1.71nm. Compared with the prior art, the photocatalyst has the advantages that the common chemical reagents are used, cheap and readily available, the method is simple, and the specific surface area of the synthesized photocatalyst is 202.8m<2>/g which is far more than that of similar commercial products; and meanwhile, high-concentration rhodamine B (RhB) can be quickly degraded under visible light in the presence of the photocatalyst, and the photocatalyst has high activity in a high-concentration RhB and p-chlorophenol system.

Description

technical field [0001] The invention relates to a photocatalyst, specifically a core-shell TiO with a large specific surface area synthesized by a one-step method 2 -BiOCl heterojunction photocatalyst. Background technique [0002] With the growth of population and economy, environmental and energy issues have become two major factors restricting human development. Semiconductor photocatalysts have unique advantages in treating dye wastewater and producing hydrogen by photolysis of water. Compared with traditional wastewater treatment and hydrogen production, photocatalysis has the advantages of mild reaction conditions, low energy consumption, and less secondary pollution, and has very important application prospects in terms of environment and energy. In recent years, there have been more and more studies on it. As we all know, TiO 2 Due to the advantages of cheapness, non-toxicity and stability, they are widely used as photocatalysts. But affected by TiO 2 Due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J35/10C02F1/30C02F101/34
Inventor 李贵生蒋波张蝶青李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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