title: Adsorption mechanisms and the effect of oxytetracycline on activated sludge.
abstract: The adsorption mechanisms and the effect of Oxytetracycline (OTC) onto activated sludge were studied. The results show that the adsorption of Oxytetracycline (OTC) onto activated sludge was coincident with the Langmuir, Freundlich and Temkin isotherm models. The Freundlich model had the best fit which suggested that chemical adsorption mechanism was dominant. The influences including pH and metal ions on the OTC were examined. It was demonstrated that the adsorption process was highly pH-dependant, which indicate that cationic exchange mechanisms may play an important role in the adsorption process. Na(+), K(+), Ca(2+), Mg(2+) and Cd(2+) ions more or less inhibited the adsorption of OTC on activated sludge while Cu(2+) enhanced the adsorption ability. The phenomenon may reflect the result that a surface complexation mechanism could involved in the adsorption.
authors.affiliation: College of Environmental Science and Engineering Tianjin, Nankai University, Wei Jin Road 94, Tianjin 300071, China; Key Laboratory of Environmental Remediation and Pollution Control/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Xiancai
authors.initials: X
authors.lastname: Song
authors.forename: Dongfang
authors.initials: D
authors.lastname: Liu
authors.forename: Guowei
authors.initials: G
authors.lastname: Zhang
authors.forename: Matthew
authors.initials: M
authors.lastname: Frigon
authors.forename: Xianrong
authors.initials: X
authors.lastname: Meng
authors.forename: Kexun
authors.initials: K
authors.lastname: Li
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D008962:Models, Theoretical; D010118:Oxytetracycline / Q000302:isolation & purification*; D056951:Photoelectron Spectroscopy; D012722:Sewage / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D007477:Ions; D008670:Metals; D012722:Sewage; D010118:Oxytetracycline
keywords: Adsorption; Cationic exchange; Metal ions; Surface complexation