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Enhanced visible-light photocatalytic degradation and disinfection performance of oxidized nanoporous g-c3n4 via decoration with graphene oxide quantum dots

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chinese Journal of catalysis 2020年第3期41卷 474-484页

作者： Jing Xu Jin Huang Zhouping Wang Yongfa Zhu State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122JiangsuChina School of Food Science and Technology Jiangnan UniversityWuxi 214122JiangsuChina International Joint Laboratory on Food Safety Jiangnan UniversityWuxi 214122JiangsuChina collaborative Innovation center of Food Safety and Quality control in Jiangsu Province Jiangnan UniversityWuxi 214122JiangsuChina Department of chemistry Tsinghua UniversityBeijing 100084China

oxidized nanoporous g-c3n4(PcnO)decorated with graphene oxide quantum dots(ox-gQDs)was successfully prepared by a facile self-assembly *** co-catalysts,the ultrasmall zero-dimensional(0 D)ox-gQDs can achieve uniform dispersion on the surface/inner channels of PcnO,as well as intimate contact with PcnO through hydrogen bonding,π-π,and chemical bonding *** contrast with PcnO,the ox-gQDs/PcnO composite photocatalysts possessed improved light-harvesting ability,higher charge-transfer efficiency,enhanced photooxidation capacity,and increased amounts of reactive species due to the upconversion properties,strong electron capturing ability,and peroxidase-like activity of the ***,the visible-light photocatalytic degradation and disinfection performances of the ox-gQDs/PcnO composite were significantly ***,the composite with a 0.2 wt.% deposited amount of ox-gQDs(ox-gQDs-0.2%/PcnO)exhibited optimum amaranth photodegradation activity,with a corresponding rate about 3.1 times as high as that of *** addition,ox-gQDs-0.2%/PcnO could inactivate about 99.6%of Escherichia coli(***)cells after 4 h of visible light irradiation,whereas only^31.9% of *** cells were killed by ***,h+,·O2-,and·OH were determined to be the reactive species generated in the photocatalytic process of the ox-gQDs/PcnO system;these species can thoroughly mineralize azo dyes and effectively inactivate pathogenic bacteria.

关键词： Photocatalysis oxidized nanoporous g-c3n4 graphene oxide quantum dots Degradation Disinfection

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