One-step fabrication of nitrogen-deficient carbon nitride through pyrolysis of melamine and 1,2,4-triazole for its enhanced photocatalytic degradation  

作　　者：Jing Ding Zongyuan Li Xueru Chen Yiwei Jiao Dashui Yuan Wei Du Hui Wan Guofeng Guan 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Jiangsu National Synergetic Innovation Center for Advanced Materials,Nanjing Tech University,Nanjing,210009,China [2]Department of Chemistry&Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai,200433,China

出　　处：《Green Chemical Engineering》2021年第3期317-326,共10页绿色化学工程（英文）

基　　金：support by the National Natural Science Foundation of China(No.21706131,No.21878159,No.22078159,No.U19B2001);the Natural Science Foundation of Jiangsu Province of China(No.BK20181378);Shanghai Science and Technology Committee(19DZ2270100);Natural Science Fund for Colleges and Universities in Jiangsu Province(No.19KJB530001);the State Key Laboratory of Materials-Oriented Chemical Engineering(ZK 201712).

摘　　要：The construction of defects in semiconductor photocatalysts,as a kind of modification methods,plays an indispensable role in the enhancement of the photocatalytic performance.Herein,nitrogen defects were successfully introduced into the framework of graphite carbon nitride(CN-T_(x))through thermal polymerization with melamine and 1,2,4-triazole as precursors.The existence of nitrogen defects in CN-T_(x) were confirmed to be located at the two-coordinated(N_(2c))C■N-C lattice sites,which resulted in the destruction of its planar structure and the initiation of n-π^(*)electron transition that greatly expanded the response range to visible light and improved the separation efficiency of photogenerated charge carrier.More significantly,CN-T_(x) could enhance photocatalytic water purification activity towards different kinds of pollutants.The photocatalytic rates of CN-T_(3) were estimated to be 2.54(tetracycline)and 2.31(2-hydroxynaphthalene)times higher than those of pristine g-C3N4.Furthermore,the possible photocatalytic degradation mechanism over CN-T_(x) photocatalyst was proposed by free radical trapping experiments combined with ERS characterization.This work provides an in-depth understanding of the important role of nitrogen defects in the electronic structure and chemical properties of g-C3N4 and its photocatalytic water purification performance.

关 键 词：Nitrogen defect Carbon nitride 1 2 4-TRIAZOLE Photocatalysis Water purification 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]