The preparation of S-SnO 2 /g-C 3 N 4 heterojunction and its photocatalytic degradation of phenol and trichlorophenol
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The preparation of S-SnO2/g-C3N4 heterojunction and its photocatalytic degradation of phenol and trichlorophenol Qing Wang1, Xin Chen2, Jing Tian1, Linyu Wei1, Yuanyuan Liu1, and Chun Yang1,3,4,*
1
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China College of Life Science, Sichuan Normal University, Chengdu 610101, China 3 Sichuan Engineering Laboratory of Livestock Manure Treatment and Recycling, Chengdu 140028001, China 4 Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610068, China 2
Received: 19 March 2020
ABSTRACT
Accepted: 12 August 2020
A new S-SnO2/g-C3N4 heterostructure composite was prepared by a solutionball milling-baking method in this study. The photodegradation efficiencies of phenol and trichlorophenol were experimentally studied at different pH values and H2O2 concentrations. XRD, XPS, UV–Vis DRS and Mott-Schottky were conducted to characterize the microstructure and test the photocatalytic performance of the materials. The photocatalysis mechanism of the S-SnO2/g-C3N4 composite was deeply explored by radical capture experiments. The results showed that some Sn4? in the S-SnO2 was substituted by S6?, which reduced the band gap of SnO2 and formed a Type II charge transfer mechanism with CN. Thus, the photocatalytic activity of the S-SnO2/g-C3N4 composite was improved compared to SnO2 and g-C3N4 by promoting the separation of photogenic electrons from holes and facilitating the generation of O2- and h?.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the continuous development of industry, a large number of phenol wastewater are discharged into the water and air, causing serious damage to the environment [1, 2]. Phenolic wastewater comes from many sources, because phenolic compounds are widely used in plastics, drugs, pesticides and paper. These phenolic wastewater discharged into water can induce carcinogenesis, teratogenic and affect the
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https://doi.org/10.1007/s10854-020-04256-z
nervous system [3]. Its impact on human environment and life is extremely serious. With the strict implementation of the State Council’s ‘‘water pollution prevention action plan’’ and ‘‘water pollution prevention and control law’’ in environmental pollution control, the discharge requirements are improved; thus, the prevention and control technology needs to be constantly updated. Therefore, the development of new materials and the exploration of
J Mater Sci: Mater Electron
new synthesis technologies are the current research hotspot. The measure of treating phenol wastewater includes physical, biological and chemical method [4]. Physical method generally adopts adsorption technology. The principle of adsorption is the phase transfer of substances, which cannot remove pollutants thoroughly and fundamentally, and requires a large amount of adsorption materials; thus, it is not conducive to large-scale production
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