Reactive species regulation by interlayered Na^(+)/H^(+)of titanate nanotubes decorated Co(OH)_(2)hollow microsphere for peroxymonosulfate activation and gatifloxacin degradation  

作　　者：Bin Zhou Long Chen Fan Li Weiliang Sun Zhicheng Pan Yumei Peng Lian Qiu Wen Liu 

机构地区：[1]The Key Laboratory of Water and Sediment Sciences,Ministry of Education,College of Environmental Sciences and Engineering,Peking University,Bejing 100871,China [2]National Engineering Laboratory of Farmland Soil Pollution Control and Remediation Technology,Yonker Environmental Protection Co.,Ltd.,Changsha 410300,China [3]State Environmental Protection Key Laboratory of All Materials Flux in Rivers,College of Environmental Science and Engineering,Peking University,Beijing 100871,China [4]Department of Civil and Environmental Engineering,Louisiana State University,Baton Rouge 70803,LA,United States [5]Laboratory of Wastewater Treatment Technology in Sichuan Province,Haitian Water Group,Chengdu 611230,China

出　　处：《Chinese Chemical Letters》2023年第12期263-268,共6页中国化学快报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2021YFA1202500);National Natural Science Foundation of China(NSFC)(Nos.52270053,52200083and 52200084);Beijing Nova Program(No.20220484215);China Postdoctoral Science Foundation(No.2021M700213);the Key Special Projects for Science and Technology of Inner Mongolia(No.2021EEDSCXSFQZD001);Emerging Engineering Interdisciplinary-Young Scholars Project,Peking University,the Fundamental Research Funds for the Central Universities.

摘　　要：Emerging organic pollutants(EoPs)in water are of great concern due to their high environmental risk,so urgent technologies are needed for effective removal of those pollutants.Herein,a heterogeneous advanced oxidation process(AoP)of peroxymonosulfate(PMS)activation by functional material was developed for degradation of a typical antibiotic,gatifloxacin(GAT).The reactive species including sulfate radical(SO^(4)^(·-))and singlet oxygen(^(1)O_(2))in this AOP were regulated by interlayered ions(Na^(+)/H^(+))of titanate nanotubes that supported on Co(OH)_(2)hollow microsphere.Both the Na-type(NaTi-CoHS)and H-type(HTi-CoHS)materials achieved efficient PMS activation for GAT degradation,and HTi-CoHS even exhibited a relatively high degradation efficiency of 96.6%within 5 min.Co(OH)_(2)was considered the key component for generation of SO_(4)^(·-)after PMS activation,while hydrogen titanate nanotubes(H-TNTs)promoted the transformation of peroxysulfate radical(SO_(5)^(·-))to ^(1)O_(2) by hydrogen bond interaction.Therefore,when the interlayer ion of TNTs transformed from Na^(+) to H^(+),more ^(1)O_(2) was produced for organic pollutant degradation.H-TNTs with lower symmetry preferred to adsorb PMS molecules to achieve interlayer electron transport through hydrogen bonding,rather than electrostatic interaction of Na^(+) for Na-TNTs.In addition,the degradation pathway of GAT mainly proceeded by the cleavage of C-N bond at the 8 N site of the piperazine ring,which was confirmed by condensed Fukui index and mass spectrographic analysis.This work gives new sights into the regulation of reactive species in AoPs by the composition of material and promotes the understanding of pollutant degradation mechanisms in water treatment process.

关 键 词：Heterogeneous catalysis Peroxymonosulfate activation Sulfate radical Singlet oxygen Antibiotic 

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