Molecular oxygen(O2)is activated to reactive oxygen species(ROS)by transferring energy and carri-ers in the photocatalytic process,which plays an important role in environmental remediation.Herein,Cs-doped carbon nitride(CN-xCs,x=0.2,0.8,1)was prepared by CsCI directly inducing the structural reconstruction of carbon nitride(CN),which had obvious molecular oxygen activation ability to promote tetracycline(TC)degradation.Besides,we explored the influence of Cs doping concentration.As a con-sequence,the doping concentration of Cs was an important factor affecting the activation of O2,which could cause changes in the physical and chemical structure of CN,make O enter the CN structure,form N vacancy defects and cyano groups.In addition,a proper amount of Cs doping could reduce the band gap value,increase the light absorption range,have better charge separation and transfer performance,which could remarkably promote the activation of O2.Benefiting from these advantages,CN-0.8Cs could generate a higher concentration of superoxide radicals(·O2-,179.30 μmol/L),which was much higher than CN(6.22 μmol/L).Therefore,it exhibited excellent TC degradation photocatalytic performance,and the rate constant k of TC degradation was 0.020 min-1,which was 6.7 times the degradation rate of CN(k=0.0030 min-1).Furthermore,the possible degradation pathways of TC were proposed based on the results of HPLC-MS.

Qian Liu;Hui Li;Hao Zhang;Zhurui Shen;Huiming Ji

School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology,Ministry of Education,Tianjin University,Tianjin 300350,China;School of Materials Science and Engineering,Nankai University,Tianjin 300350,China

中国化学快报（英文版）

[1]Qian Liu;Hui Li;Hao Zhang;Zhurui Shen;Huiming Ji-.The role of Cs dopants for improved activation of molecular oxygen and degradation of tetracycline over carbon nitride)[J].中国化学快报（英文版）,2022(11):4756-4760

xCs,CsCI,8Cs

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