title: A novel magnetic adsorbent based on waste litchi peels for removing Pb(II) from aqueous solution.
abstract: A new magnetic bioadsorbent, magnetic litchi peel (MLP), was synthesized by coating powdered litchi peel with Fe3O4, and was used for removing Pb(II) from aqueous solutions. The influencing factors, adsorption isotherms, kinetics, and thermodynamics of Pb(II) adsorption by MLP were investigated using batch assays. Optimum Pb(II) adsorption by MLP was achieved using a contact time of 120 min, an adsorbent dose of 5 g/L, and pH of 6.0. The adsorption equilibrium data conformed to the Langmuir isotherm model, yielding a maximum Pb(II) adsorption capacity of 78.74 mg/g. The adsorption kinetics for Pb(II) adsorption by MLP followed a pseudo-second-order model. The thermodynamic results suggested that Pb(II) adsorption by MLP was spontaneous and exothermic. Additionally, the magnetic adsorbent was easily and rapidly separated out of solution under an external magnetic field.
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China; Environmental Science and Engineering College, Hohai University, Nanjing, Jiangsu 210098, PR China.
authors.forename: Ruixue
authors.initials: R
authors.lastname: Jiang
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Jiyu
authors.initials: J
authors.lastname: Tian
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Jinqiu
authors.initials: J
authors.lastname: Qi
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Shujuan
authors.initials: S
authors.lastname: Sun
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China. Electronic address: lixiaochen02@163.com.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Li
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D005638:Fruit; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry*; D032125:Litchi; D060328:Magnetic Phenomena; D019216:Metals, Heavy / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D007854:Lead
keywords: Adsorption; Litchi peel; Magnetic bioadsorbent; Pb(II); Separation