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Preparation method and application of ZnO-doped TiO2 composite hollow sphere

A hollow sphere, carbon sphere technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, light water/sewage treatment, etc., to achieve separation, broaden the spectral response range, and reduce energy consumption. Effect

Inactive Publication Date: 2010-12-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About ZnO Nanoparticles and TiO 2 nanoparticles for composite or ZnO-TiO 2 The preparation of composite films and their application to photocatalytic degradation research have been reported [D.L.Liao, C.A.Badour, B.Q.Liao.Preparation of nanosized TiO 2 / ZnOcomposite catalyst and its photocatalytic activity for degradation of methyl orange. Journal of Photochemistry and Photobiology A: Chemistry 194(2008) 11-19, Jintao Tian, ​​Lijuan Chen, Yansheng Yin, Xin Wang, Jinhui Dai, Zhibin Zhu, Xiaoyun Liu, Pingwei Wu. Photocatalyst of TiO 2 / ZnO nanocomposite film: Preparation, characterization, and photodegradation activity of methyl orange. Surface & Coatings Technology 204 (2009) 205-214], however for ZnO doped TiO 2 The preparation of hollow spheres and the photocatalytic degradation of cationic dyes have not been reported in the literature at home and abroad

Method used

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  • Preparation method and application of ZnO-doped TiO2 composite hollow sphere
  • Preparation method and application of ZnO-doped TiO2 composite hollow sphere
  • Preparation method and application of ZnO-doped TiO2 composite hollow sphere

Examples

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example 1

[0018] 1) Weigh 0.0022g of zinc acetate hexahydrate into a three-neck flask with stirring, measure 30ml of absolute ethanol, and prepare an ethanol solution of zinc acetate. Then weigh 0.06g of nano-carbon spheres, the diameter of which is in the range of 150-400nm, add 0.3ml of distilled water into it, and ultrasonically disperse until uniformly mixed.

[0019] 2) Add 30 ml of absolute ethanol into a dry constant pressure dropping funnel, measure 0.3 ml of n-butyl titanate and add it to prepare an ethanol solution of n-butyl titanate.

[0020] 3) Slowly add n-butyl titanate ethanol solution into the mixed solution obtained in step 1) under stirring condition, stir, and heat to reflux at 80° C. for 6 h. After the reflux is completed, continue to stir for 30 minutes, centrifuge, wash, and dry to obtain Zn 2+ Doped carbon / titania core-shell particles.

[0021] 4) with the Zn that step 3) obtains 2+ The doped carbon / titanium dioxide core-shell particles were fired in a mufur f...

example 2

[0025] 1) Weigh 0.0066g of zinc acetate hexahydrate into a three-neck flask with stirring, measure 50ml of absolute ethanol, and prepare an ethanol solution of zinc acetate. Then weigh 0.06g of nano-carbon spheres with a diameter ranging from 150 to 400nm, add 0.5ml of distilled water into it, and ultrasonically disperse until uniformly mixed.

[0026] 2) Add 50 ml of absolute ethanol into a dry constant-pressure dropping funnel, measure 0.3 ml of n-butyl titanate and add it to prepare an ethanol solution of n-butyl titanate.

[0027] 3) Slowly add n-butyl titanate ethanol solution into the mixed solution obtained in step 1) under stirring condition, stir, and heat to reflux at 80° C. for 6 h. After the reflux is completed, continue to stir for 6 hours, centrifuge, wash, and dry to obtain Zn 2+ Doped carbon / titania core-shell particles.

[0028] 4) with the Zn that step 3) obtains 2+ The doped carbon / titanium dioxide core-shell particles were burned in a mufur furnace at 55...

example 3

[0031] Operate according to the preparation process steps of specific example 2, the difference is that the amount of zinc acetate hexahydrate added in step 2) is 0.022g, and the TiO doped with ZnO is obtained 2 Hollow sphere, wherein the molar ratio of Zn / Ti in the hollow sphere is 1 / 10.

[0032] Attachment of the present invention figure 1 According to the curve of example 3, it is the XRD pattern of the photocatalyst that makes. It can be seen from the figure that the TiO in the composite photocatalyst 2 For the anatase structure.

[0033] Attachment of the present invention image 3 It is the SEM picture of the photocatalyst prepared by Example 3. It can be seen from the figure that the prepared photocatalyst has a hollow spherical structure with an average diameter of 338.38nm, ranging from 200 to 481.18nm, and an average wall thickness of 39.3nm, ranging from 18.18 to 45.46nm. The specific surface area of ​​the sample is 256.30m 2 / g, the photocatalytic degradation...

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Abstract

The invention discloses a preparation method of a ZnO-doped TiO2 hollow sphere composite photocatalyst, comprising the following steps of: preparing Zn<2+> doped carbon / titanium dioxide nuclear-shell particles by adopting a template method and a hydrolytic cladding method, and then calcinating the nuclear-shell particles to obtain the ZnO-doped TiO2 nano hollow sphere composite photocatalyst. The photocatalyst can be used for catalyzing and degrading cationic dyes under ultraviolet or solar visible light. By utilizing low-cost titanium sources, zinc sources and carbon spheres for preparing the ZnO-doped TiO2 nano hollow sphere composite photocatalyst, the preparation method has the advantages of low cost of raw materials, simple process, short preparation period, less energy consumption and belongs to green synthetic technologies. After TiO2 hollow spheres are doped and compounded by utilizing ZnO, absorption spectrums generate red shift by utilizing the interface coupling effect of the TiO2 hollow spheres and the ZnO so that the spectral response range of the photocatalyst is broadened, and the utilization rate of solar energy is improved; and meanwhile, the method can also inhibit the compounding of photon-generated carriers and improve the activity of the photocatalyst by utilizing the high conductivity of ZnO particles.

Description

technical field [0001] The invention belongs to the preparation of nano composite material and its application in the field of environmental protection. Specifically refers to the preparation of Zn by ultrasonic hydrolysis coating method using nano-carbon spheres, n-butyl titanate and zinc acetate as the main raw materials. 2+ Doped carbon / titanium dioxide core-shell particles were calcined to prepare ZnO-doped TiO 2 Hollow sphere photocatalyst, and it was used in the research of photocatalytic degradation of cationic dye wastewater. Background technique [0002] Since the 21st century, energy shortage and environmental pollution are two major problems facing human beings. The development and utilization of renewable energy to solve the problem of environmental pollution has received widespread attention. Among all renewable energy sources, solar energy is an inexhaustible, non-polluting and clean energy source, so using solar energy to catalyze the degradation of organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/08C02F1/30C02F1/32
CPCY02W10/37
Inventor 蒋银花邱琳张文莉倪良吴小黎燕云
Owner JIANGSU UNIV
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