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Highly efficient visible photocatalytic disinfection and degradation performances of microtubular nanoporous g-C3N4 via hierarchical construction and defects engineering

查看全文 作　　者：Jing [1,2,3,4]Xu;Zhouping [1,2,3,4]Wang;Yongfa [5]Zhu 高影响力作者 机构地区：[1]State Key Laboratory of Food Science and Technology,Jiangnan University,Wuxi 214122,China;[2]School of Food Science and Technology,Jiangnan University,Wuxi 214122,China;[3]International Joint Laboratory on Food Safety,Jiangnan University,Wuxi 214122,China;[4]Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province,Jiangnan University,Wuxi 214122,China;[5]Department of Chemistry,Tsinghua University,Beijing 100084,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第47卷第14期,共11页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China(No.21707052);the Jiangsu Agriculture Science and Technology Innovation Fund(No.CX(18)2025);the Fundamental Research Funds for the Central Universities(Nos.JUSRP11905 and JUSRP51714B);the Key Research and Development Program of Jiangsu Province(No.BE2017623)。 摘　　要：Herein,microtubular nanoporous g-C3N4(TPCN)with hierarchical structure and nitrogen defects was prepared via a facile self-templating approach.On one hand,the hexagonal tubular structure can facilitate the light reflection/scattering,provide internal/external active sites,and endow the electron with oriented transfer channels.The well-developed nanoporosity can result in large specific surface area and abundant accessible channels for charge migration.On the other hand,the existence of nitrogen vacancies can improve the light harvesting(>450 nm)and prompt charge separation by acting as the shallow charge traps.More NHxgroups in g-C3N4 framework can promote the interlayer charge transport by generating hydrogen-bonding interaction between C3N4 layers.Therefore,TPCN possessed highly efficient visible photocatalytic performances to effectively inactivate Escherichia coli(E.coli)cells and thoroughly mineralize organic pollutants.TPCN with the optimum bactericidal efficiency can completely inactivated5×10^6 cfu mL^-1 of E.coli cells after 4 h of irradiation treatment,while about 74.4%of E.coli cells were killed by bulk g-C3N4(BCN).Meanwhile,the photodegradation rate of TPCN towards methylene blue,amaranth,and bisphenol A were almost 3.1,2.5 and 1.6 times as fast as those of BCN.Furthermore,h^+and·O2^- were the reactive species in the photocatalytic process of TPCN system. 关 键 词：g-C3N4 photocatalyst Hierarchical structure Nitrogen defects DISINFECTION DEGRADATION
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