Preparation and application of Sr<2+>-doped TiO2 composite hollow sphere photocatalyst

A technology of photocatalysts and hollow spheres, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of less energy consumption, simple process, and increased utilization

Inactive Publication Date: 2014-02-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of TiO2 hollow spheres in photocatalysis has been reported [Wu Liangzhuan, Zhi Jinfang. One-step synthesis of anatase-type titanium dioxide hollow spheres in aqueous phase. Acta Physicochemical Sinica. 2007, 23(8 ):1173-1177], the literature reported the preparation of Sr-doped TiO2 nanoparticles and their application in photocatalytic degradation [Yan Shaofeng; Sr-doped nano-TiO2Process of photocatalytic performance. Journal of Liaoning University of Engineering and Technology (Natural Science Edition), 2011, 02: 117–119], however for Sr2+doped TiO2 The preparation of hollow spheres and their use for visible light catalytic degradation of cationic dyes have not been reported in the literature at home and abroad.

Method used

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  • Preparation and application of Sr&lt;2+&gt;-doped TiO2 composite hollow sphere photocatalyst
  • Preparation and application of Sr&lt;2+&gt;-doped TiO2 composite hollow sphere photocatalyst
  • Preparation and application of Sr&lt;2+&gt;-doped TiO2 composite hollow sphere photocatalyst

Examples

Experimental program
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Effect test

example 1

[0024] 1) First add 50mL of absolute ethanol and 0.3mL of distilled water into a three-neck flask with stirring, then add 3.004*10 -5 g of strontium nitrate, after stirring to dissolve, continue to add 0.06g of nano carbon spheres, the diameter of carbon spheres is in the range of 100~250nm, ultrasonically disperse until mixed evenly.

[0025]2) Add 50mL of absolute ethanol to a dry constant pressure dropping funnel, measure 0.5mL of n-butyl titanate and add it to prepare an ethanol solution of n-butyl titanate. Then it was slowly added into the three-neck flask under the condition of stirring, and after stirring for 5 minutes, it was heated to reflux at 80° C. for 6 hours. After reflux, continue to stir for 30 minutes, centrifuge, wash, and dry to obtain Sr 2+ Doped carbon / titanium dioxide core-shell particles. Sr 2+ doped TiO 2 Composite hollow sphere photocatalyst, wherein the molar ratio of Sr / Ti is 0.1 / 100.

[0026] The specific surface area of ​​the sample is 225.2...

example 2

[0029] 1) First add 60mL of absolute ethanol and 1mL of distilled water into a three-neck flask with stirring, then add 1.802*10 -3 g of strontium nitrate, stir and dissolve, then continue to add 0.6g of nano-carbon spheres, the diameter of the carbon spheres ranges from 100 to 250nm, and ultrasonically disperse until they are evenly mixed.

[0030] 2) Add 70mL of absolute ethanol to a dry constant pressure dropping funnel, measure 1.5mL of n-butyl titanate and add it to prepare an ethanol solution of n-butyl titanate. Then it was slowly added into the three-necked flask under the condition of stirring, and after stirring for 15 minutes, it was heated to reflux at 70° C. for 8 hours. After the reflux is completed, continue to stir for 60 minutes, centrifuge, wash, and dry to obtain Sr 2+ Doped carbon / titanium dioxide core-shell particles. Sr 2+ doped TiO 2 Composite hollow sphere photocatalyst, wherein the molar ratio of Sr / Ti is 0.2 / 100.

[0031] The specific surface are...

example 3

[0033] 1) First add 60mL of absolute ethanol and 1.5mL of distilled water into a three-neck flask with stirring, then add 9.010*10 -3 g of strontium nitrate, after stirring to dissolve, continue to add 0.9g of nano-carbon spheres, the diameter of which is in the range of 100-250nm, and ultrasonically disperse until they are evenly mixed.

[0034] 2) Add 80mL of absolute ethanol to a dry constant pressure dropping funnel, measure 3mL of n-butyl titanate and add it to prepare an ethanol solution of n-butyl titanate. Then it was slowly added into the three-necked flask under the condition of stirring, and after stirring for 20 minutes, it was heated to reflux at 90° C. for 5 hours. After the reflux is completed, continue to stir for 60 minutes, centrifuge, wash, and dry to obtain Sr 2+ Doped carbon / titanium dioxide core-shell particles. Sr 2+ doped TiO 2 Composite hollow sphere photocatalyst, wherein the molar ratio of Sr / Ti is 0.5 / 100.

[0035] Attachment of the present inv...

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Abstract

The invention discloses a preparation method of a Sr<2+>-doped TiO2 composite hollow sphere photocatalyst, and belongs to the environmental protection field. The method comprises the following steps: adopting a template method-hydrolysis coating method to prepare a Sr<2+>-doped C / TiO2 core-shell particle, and calcining the particle at a certain temperature for a certain time to obtain the Sr<2+>-doped TiO2 composite hollow sphere photocatalyst. The Sr<2+>-doped TiO2 composite hollow sphere photocatalyst prepared in the invention can be used in the visible photocatalysis degradation of a cationic dye solution. The method has the advantages of pollution-free raw materials, simple technology, no emission of pollutants in the preparation process, short preparation period, less energy consumption and low cost, is a green synthesis technology, and can realize the large scale preparation. The doping of Sr<2+> improves the visible response of the photocatalyst, improves the lives of electrons and cavities, promotes the transmission of photoelectrons and substantially improves the visible photocatalytic activity of the catalyst.

Description

technical field [0001] The invention belongs to the preparation of nanocomposite materials and their application in the field of environmental protection, specifically referring to Sr 2+ doped TiO 2 A preparation method of nanocomposite hollow sphere photocatalyst. Background technique [0002] Photocatalytic technology is an efficient, clean, environmentally friendly, and harmless green environmental purification technology. It has broad application prospects in the fields of environmental protection, health care, building materials, textiles, precious metal recovery, and food preservation. The widely studied semiconductor photocatalysts are CdS, SnO 2 、TiO 2 , ZnO, ZnS, PbS, MoO 3 , SrTiO 3 and V 2 o 5 etc. Among these semiconductors, TiO 2 It is an excellent semiconducting metal oxide with stable chemical properties, non-toxicity and biocompatibility, so it has been widely used in many fields such as catalysis, electronics, environment and medical treatment, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25C02F1/30
Inventor 蒋银花陈欣张文莉其他发明人请求不公开姓名
Owner JIANGSU UNIV
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