The unique heterojunction photocatalyst of graphite carbon nitride(g-C3N4)modified ultrafine TiO2(g-C3N4/TiO2)was successfully fabricated by electrochemical etching and co-annealing method.However,the effects of various environmental factors on the degradation of TC by g-C3N4/TiO2 and the inter-nal reaction mechanism are still unclear.In this study,the effects of initial pH,anions,and cations on the photocatalytic degradation of tetracycline hydrochloride(TC)by g-C3N4/TiO2 were systematically ex-plored,and the scavenging experiment and intermediate detection were conducted to better reveal the mechanism on photocatalytic degradation of TC.The results showed that the removal efficiency of photo-catalytic degradation of TC by g-C3N4/TiO2 could reach 99.04％under Xenon lamp irradiation within 120 min.The unique g-C3N4/TiO2 heterojunction photocatalyst showed excellent photocatalytic performance for the degradation of TC at pH 3～7,and possesses outstanding anti-interference ability to NO3-,CI-,Na+,Ca2+and Mg2+ions in natural waters during the photocatalytic degradation TC process.Superoxide radicals(O2·-)and hydroxyl radicals(·OH)were proved as the main reactive species for TC degradation,and the possible mechanism of the unique photocatalytic system for g-C3N4/TiO2 was also proposed.The above results can provide a reliable basis and theoretical guidance for the design and application of visi-ble photocatalyst with high activity to degrade the actual wastewater containing TC.

Bin Zhang;Xu He;Chengze Yu;Guocheng Liu;Dong Ma;Chunyue Cui;Qinghua Yan;Yingjie Zhang;Guangshan Zhang;Jun Ma;Yanjun Xin

Qingdao Engineering Research Center for Rural Environment,Water Resources Protection and Utilization Center for Rural Areas,Qingdao Agricultural University,Qingdao 266109,China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China;School of Marine Science and Technology,Sino-Europe Membrane Technology Research Institute Harbin Institute of Technology,Weihai 264209,China

中国化学快报（英文版）

[1]Bin Zhang;Xu He;Chengze Yu;Guocheng Liu;Dong Ma;Chunyue Cui;Qinghua Yan;Yingjie Zhang;Guangshan Zhang;Jun Ma;Yanjun Xin-.Degradation of tetracycline hydrochloride by ultrafine TiO2 nanoparticles modified g-C3N4 heterojunction photocatalyst:Influencing factors,products and mechanism insight)[J].中国化学快报（英文版）,2022(03):1337-1342

Mg2+ions,visi

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