Preparation method of ZnO / g-C3N4 composite photocatalyst

A photocatalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as weak composite structure, easy formation of agglomerated structure, and reduced catalyst activity, so as to improve Activity, increased crystallinity, enhanced separation effect

Inactive Publication Date: 2013-03-06
EAST CHINA UNIV OF SCI & TECH +1
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Problems solved by technology

Although the preparation process of this method is relatively simple, the prepared ZnO / g-C 3 N 4 In particles, ZnO and g-C 3 N 4 The composite structure combined with each other is weak, and the energy level matching between the two semiconductors cannot be fully exerted, and the agglomeration structure is easily formed between the particles, which seriously reduces the catalyst activity.

Method used

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  • Preparation method of ZnO / g-C3N4 composite photocatalyst

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Embodiment 1

[0019] ZnO / g-C 3 N 4 The preparation adopts two-stage solvothermal-ultrasonic method. According to zinc acetate, ethanol, diethanolamine, g-C 3 N 4 Mass ratio = 1:10:20:1.5, mixed vigorously for 6 hours; then transferred the mixed system into a polytetrafluoroethylene-lined high-pressure reactor, reacted at 150°C for 24h, and at 190°C for 24h; after that, filtered, Ultrasonic dispersion (frequency 40KH Z , the power is 300W), washing, and repeating four times, the filter cake is dried and calcined at 500° C. for 2 h in an air atmosphere; it is ground into powder after cooling.

Embodiment 2

[0021] ZnO / g-C 3 N 4 The preparation adopts two-stage solvothermal-ultrasonic method. ZnO / g-C 3 N 4 Preparation according to zinc acetate, ethanol, diethanolamine, g-C 3 N 4 Mass ratio = 1:15:20:2.0, mixed vigorously for 8 hours; then transferred the mixed system into a polytetrafluoroethylene-lined high-pressure reactor, reacted at 130°C for 30h, and reacted at 180°C for 18h; then filtered, Ultrasonic dispersion (frequency 40KH Z , the power is 600W), washing, and repeating four times, the filter cake is dried and calcined at 500° C. for 1 h in an air atmosphere; it is ground into powder after cooling.

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Abstract

The invention relates to a preparation method of a ZnO / g-C3N4 composite photocatalyst. A two-stage solvent thermal / ultrasonic dispersing method is employed to prepare the ZnO / g-C3N4 composite photocatalyst. After the two-stage solvent thermal treatment, porous ZnO nano crystalline with high dispersion grown on the g-C3N4 can be obtained, and the ZnO nanocrystalline and the g-C3N4 can form a good composite structure; the ultrasonic treatment reduces agglomeration among the ZnO / g-C3N4 composite particles, and improves dispersion of the composite catalyst; and the nano composite particles with high dispersion strengthen effective utilization of sun light by the catalyst, and improve activity of the catalyst. The preparation method provided by the invention has the advantages of cheap raw materials and simple process; and the prepared composite photocatalyst has a broad application prospects in the fields of wastewater treatment and gas purification.

Description

【Technical field】 [0001] The present invention relates to the field of catalyst technology, specifically, a ZnO / g-C 3 N 4 Preparation method of composite photocatalyst. 【Background technique】 [0002] Due to the rapid economic and social development and the rapid growth of population, environmental pollution and energy crisis have become severe challenges to the development of today's society, and the development and utilization of clean and efficient energy has become a top priority for all countries. For this reason, how to make better use of solar energy has become the research focus of various countries. [0003] Photocatalyst has become an ideal environmental pollution control and clean energy utilization and production technology due to its advantages of deep reaction at room temperature and direct or indirect use of solar energy to drive the reaction. [0004] Due to its stable photochemical properties, non-toxicity, and low cost, ZnO has become one of the most pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10
Inventor 董海军陈爱平曾炽涛何洪波夏淼
Owner EAST CHINA UNIV OF SCI & TECH
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