title: Adsorption of copper and lead in aqueous solution onto bentonite modified by 4'-methylbenzo-15-crown-5.
abstract: The adsorption of heavy metal ions (Cu2+ and Pb2+) onto organobentonite modified by 4'-methylbenzo-15-crown-5 (MB15C5) from bentonite compared with natural bentonite (N-Bentonite) is described in this paper. The kinetic parameters of the models are calculated and discussed, and closely fitted a pseudo-second-order model in all cases. For bentonite modified with MB15C5 (MB15C5-Bentonite) and N-Bentonite, the equilibrium data closely fitted the Langmuir model and showed the following affinity order: Pb2+ > Cu2+, and the adsorption capacity of MB15C5-Bentonite is higher than that of N-Bentonite for Pb2+ and Cu2+. The effect of pH is examined over the range 1.5-6. The adsorption of Cu2+ and Pb2+ increases with increasing pH and the adsorption of Cu2+ and Pb2+ reaches a maximum at pH 3.5-6.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, 22 Hankou Road, Nanjing University, Nanjing 210093, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Liu
authors.forename: Xing
authors.initials: X
authors.lastname: Shen
authors.forename: Qiming
authors.initials: Q
authors.lastname: Xian
authors.forename: Haidong
authors.initials: H
authors.lastname: Chen
authors.forename: Huixian
authors.initials: H
authors.lastname: Zou
authors.forename: Shixiang
authors.initials: S
authors.lastname: Gao
mesh_terms: D001546:Bentonite / Q000737:chemistry; D003300:Copper / Q000493:pharmacokinetics*; D043844:Crown Ethers; D007854:Lead / Q000493:pharmacokinetics*; D012996:Solutions; D014867:Water
chemical_list: D043844:Crown Ethers; D012996:Solutions; D014867:Water; D001546:Bentonite; D007854:Lead; C042148:15-crown-5; D003300:Copper