A mechanistic study of ciprofloxacin adsorption by goethite in the presence of silver and titanium dioxide nanoparticles  

作　　者：Jie Tang Yun Wang Qiang Xue Fei Liu Kenneth CCarroll Xiaohua Lu Taogeng Zhou Dengjun Wang 

机构地区：[1]MOE Key Laboratory of Groundwater Circulation and Environmental Evolution,China University of Geosciences(Beijing),Beijing 100083,China [2]Beijing Key Laboratory of Water Resources and Environmental Engineering,School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,China [3]Water Science and Management Program,New Mexico State University,MSC 3Q,USA [4]Plant&Environmental Science,New Mexico State University,Las Cruces,NM 88003,USA [5]National Institute of Metrology,Beijing 100022,China [6]Beijing Institute of Technology,Beijing 100081,China [7]School of Fisheries,Aquaculture and Aquatic Sciences,Auburn University,Auburn,AL 36849,USA

出　　处：《Journal of Environmental Sciences》2022年第8期46-56,共11页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (No. 2020YFC1808300);the Fundamental Research Fund for the Central Universities (No. 2652019115);Guangxi Key Research Project (Guike AB18050026);the Natural Science Foundation of China (No. 41731282)。

摘　　要：The adsorption behaviors of ciprofloxacin(CIP),a fluoroquinolone antibiotic,onto goethite(Gt)in the presence of silver and titanium dioxide nanoparticles(AgNPs and TiO_(2)NPs)were investigated.Results showed that CIP adsorption kinetics in Gt with or without NPs both followed the pseudo-second-order kinetic model.The presence of AgNPs or TiO_(2)NPs inhibited the adsorption of CIP by Gt.The amount of inhibition of CIP sorption due to AgNPs was decreased with an increase of solution pH from 5.0 to 9.0.In contrast,in the presence of TiO_(2)NPs,CIP adsorption by Gt was almost unchanged at pHs of 5.0∼6.5 but was decreased with an increase of pH from 6.5 to 9.0.The mechanisms of AgNPs and TiO_(2)NPs in inhibiting CIP adsorption by Gt were different,which was attributed to citrate coating of AgNPs resulting in competition with CIP for adsorption sites on Gt,while TiO_(2)NPs could compete with Gt for CIP adsorption.Additionally,CIP was adsorbed by Gt or TiO_(2)NPs through a tridentate complex involving the bidentate inner-sphere coordination of the deprotonated carboxylic group and hydrogen bonding through the adjacent carbonyl group on the quinoline ring.These findings advance our understanding of the environmental behavior and fate of fluoroquinolone antibiotics in the presence of NPs.

关 键 词：CIPROFLOXACIN GOETHITE Silver nanoparticles Titanium dioxide nanoparticles ADSORPTION 

分 类 号：X505[环境科学与工程—环境工程]