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High activity ZnO/SnO2 core-shell composite photocatalyst preparation method

A technology of composite light and catalyst, applied in the field of photocatalysis, can solve the problems of large band gap energy, low photocatalytic performance, easy recombination of holes and electrons, etc., and achieves the effects of easy control, simple process and easy realization.

Inactive Publication Date: 2013-03-27
TIANJIN URBAN CONSTR COLLEGE
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AI Technical Summary

Problems solved by technology

[0004] The main problem at present is: in the photocatalytic oxidation process, the single semiconductor material photocatalyst has a large band gap energy, and holes are easy to recombine with electrons, resulting in low photocatalytic performance.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0023] First, the SnCl 4 ·5H 2 Mix O with 2 mol / L ammonia water to prepare a 0.04 mol / L reaction solution, react at 85°C for 4 hours, and wash the resulting precipitate to remove Cl - , isolated, and then dried at 100°C to obtain Sn(OH) 4 Powder. Then, the prepared Sn(OH) 4 Add 0.02mol / L of Zn(NO 3 ) 2 ·6H 2 In the O solution, after stirring evenly, add 2 mol / L ammonia water dropwise to adjust its pH value to 8. After fully reacting, the resulting precipitate is washed with deionization, isolated, and then dried at 100°C to obtain Zn(OH)2 / Sn(OH) 4 Powder. Finally, the Zn(OH) 2 / Sn(OH) 4 The powder is heated at a rate of 2°C / min to 250°C for 0.5h, and then at a rate of 2°C / min to 500°C for 1h to obtain ZnO / SnO 2 Core-shell structure composite photocatalyst.

[0024] Prepared as described above.

[0025] The available catalytic activity is higher than that of single ZnO and SnO prepared by the same precipitation method 2 Core-shell structure ZnO / SnO nanophotocataly...

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Abstract

The invention belongs to the technical field of photocatalysis, and particularly relates to a high activity ZnO / SnO2 core-shell structure composite photocatalyst preparation method and related process parameters. The preparation method is a step-by-step precipitation method, and comprises: adopting SnCl4.5H2O as a precursor, and adopting ammonia water as a precipitating agent to prepare Sn(OH)4 powder; adding the prepared Sn(OH)4 to a Zn(NO3)2.6H2O solution with a certain concentration, uniformly stirring, adding ammonia water in a dropwise manner, and adjusting the PH value; carrying out washing, segregation and drying on the obtained product Zn(OH)2 / Sn(OH)4; and finally carrying out calcinations on the Zn(OH)2 / Sn(OH)4 composite powder to obtain the ZnO / SnO2 core-shell structure composite photocatalyst. According to the present invention, influence on a structure and performances of the ZnO / SnO2 composite photocatalyst by a precursor concentration, a pH value and other process parameters are investigated, and optimal process parameters for high activity ZnO / SnO2 core-shell structure composite photocatalyst preparation are obtained.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, specifically a method for preparing highly active ZnO / SnO 2 The method and related process parameters of core-shell structure composite photocatalyst. technical background [0002] Energy shortage and environmental pollution are common problems faced by all mankind in this century. How to rationally utilize the limited energy in nature, effectively control and solve the problem of environmental pollution is a hot topic studied by scientists from all over the world in the new century. In recent years, the semiconductor photocatalytic oxidation technology that has gradually emerged has provided us with an ideal method for rationally utilizing energy and controlling environmental pollution. It enables us to truly realize the use of inexhaustible and inexhaustible solar energy to solve environmental pollution and energy shortage problems. [0003] Semiconductor photocatalytic oxidation tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/14B01J37/03
Inventor 刘志锋李亚彬雅菁
Owner TIANJIN URBAN CONSTR COLLEGE