title: [Adsorption characteristics of ciprofloxacin in ustic cambosols].
abstract: In order to understand the adsorption characteristics of ciprofloxacin in ustic cambosols, static adsorption experiments were used to investigate dynamic and isothermal adsorption characteristics of ciprofloxacin in ustic cambosols, influence of pH on the adsorption process. Results showed that the absorption process of ciprofloxacin can be divided into two stages: fast adsorption and slow balance. The adsorption processes followed the pseudo-second-order kinetics, with adsorption rate of 1.138 x 10(-3) - 2.849 x 10(-2) kg x (min x mg)(-1). Adsorption isotherms of ciprofloxacin in ustic cambosols were well described by the Freundlich and Langmuir equation, Freundlich equation is more applicable than Langmuir equation, with the adsorption capacity (lgKf) of 2.725. Moreover, at the tested pH interval of 4-9, lgKd values of ciprofloxacin increased and then decreased with the increase of pH in ustic cambosols; the maximum adsorption of ciprofloxacin in ustic cambosols can be obtained when the pH value was 5 with lgKd value was 3.11; strong acid or alkali conditions were unfavorable to ciprofloxacin adsorption. It could be deduced that cationic adsorptions was one of the significant sorption mechanisms for ciprofloxacin in ustic cambosols.
authors.affiliation: College of Resources and Environment, Graduate University of Chinese Academy of Sciences, Beijing 100049, China. cuihao0087@sina.com
authors.forename: Hao
authors.initials: H
authors.lastname: Cui
authors.forename: Shu-ping
authors.initials: SP
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002412:Cations / Q000737:chemistry*; D002939:Ciprofloxacin / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D018570:Risk Assessment; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D002412:Cations; D012987:Soil; D012989:Soil Pollutants; D002939:Ciprofloxacin