title: A study of the kinetics and isotherms for Cr(VI) adsorption in a binary mixture of Cr(VI)-Ni(II) using hierarchical porous carbon obtained from pig bone.
abstract: Cr(VI) adsorption in a binary mixture Cr(VI)-Ni(II) using the hierarchical porous carbon prepared from pig bone (HPC) was investigated. The various factors affecting adsorption of Cr(VI) ions from aqueous solutions such as initial concentration, pH, temperature and contact time were analyzed. The results showed excellent efficiency of Cr(VI) adsorption by HPC. The kinetics and isotherms for Cr(VI) adsorption from a binary mixture Cr(VI)-Ni(II) by HPC were studied. The adsorption equilibrium described by the Langmuir isotherm model is better than that described by the Freundlich isotherm model for the binary mixture in this study. The maximum adsorption capacity was reliably found to be as high as 192.68 mg/g in the binary mixture at pH 2. On fitting the experimental data to both pseudo-first- and second-order equations, the regression analysis of the second-order equation gave a better R² value.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn; *These authors contributed equally to this work and should be considered co-first authors.
authors.forename: Chengxian
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn; *These authors contributed equally to this work and should be considered co-first authors.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn.
authors.forename: Bicheng
authors.initials: B
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn.
authors.forename: Changfeng
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn.
authors.forename: Chengming
authors.initials: C
authors.lastname: Li
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, China E-mail: huangyq@mail.buct.edu.cn.
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009532:Nickel / Q000737:chemistry*; D013552:Swine; D013696:Temperature
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion; D002244:Carbon; D009532:Nickel