title: Intercalation and adsorption of ciprofloxacin by layered chalcogenides and kinetics study.
abstract: The hydrothermally synthesized layered chalcogenide, K(2x)Mn(x)Sn(3-x)S6 (x=0.5-0.95) (KMS-1), was applied to remove ciprofloxacin from aqueous solution. Kinetic data showed the removal reaction followed a pseudo-second-order kinetic model and the rate controlling step was both through external film and intraparticle diffusion. The adsorption of CIP by KMS-1 is endothermic and the maximum adsorption capacity of KMS-1 was 199.6, 230.9 and 269.5 mg/g at temperature of 10, 25 and 40°C, respectively. The heavy metal ions had great effect on the removal efficiency of CIP and the degree of inhibition followed the order: Pb(2+)>Zn(2+)>Cd(2+)>Ni(2+). The shift of Bragg peaks from XRD at various pH accompanying CIP removal and FE-SEM images confirmed that cation exchange is the major mechanism for the adsorption of CIP by KMS-1. In the pH range of 4.0-7.0, the intercalation of cationic CIP adopted a titled orientation of di-molecular CIP in KMS-1 with the titling angle of 68° and 42°, respectively. A vertical arrangement of the zwitterionic CIP adsorbed on the surface of KMS-1 was also confirmed. These results suggested that KMS-1 is an effective adsorbent to remove CIP from water.
authors.affiliation: Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, PR China; Ningbo Urban Environment Observation and Research Station - NUEORS, Chinese Academy of Sciences, Ningbo, Zhejiang 315800, PR China; State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Li
authors.affiliation: Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, PR China.
authors.forename: Yun-Xia
authors.initials: YX
authors.lastname: Wang
authors.affiliation: Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, PR China.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China.
authors.forename: Baoling
authors.initials: B
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, PR China. Electronic address: mlfu@iue.ac.cn.
authors.forename: Ming-Lai
authors.initials: ML
authors.lastname: Fu
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000302:isolation & purification*; D018011:Chalcogens / Q000737:chemistry*; D002939:Ciprofloxacin / Q000302:isolation & purification*; D004058:Diffusion; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D000900:Anti-Bacterial Agents; D018011:Chalcogens; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D014867:Water; D002939:Ciprofloxacin
keywords: Adsorption; Cation exchange; Chalcogenides; Ciprofloxacin; Intercalation