title: 3D hierarchical flower-like nickel ferrite/manganese dioxide toward lead (II) removal from aqueous water.
abstract: A functionalized magnetic nickel ferrite/manganese dioxide (NiFe2O4/MnO2) with 3D hierarchical flower-like and core-shell structure was synthesized by a facile hydrothermal approach and applied for the removal of Pb(II) ions from aqueous solutions. Batch adsorption experiments were conducted to study the effect of solution pH, initial Pb(II) concentration, and dose of absorbents on the Pb(II) removal by NiFe2O4/MnO2. The NiFe2O4/MnO2nanocomposites showed the fast Pb(II) adsorption performance with the maximum adsorption capacity of 85.78mgg-1. The adsorption kinetics of Pb(II) onto NiFe2O4/MnO2obeyed a pseudo-second-order model. The isothermal experimental results indicated that the Langmuir model was fitted better than the Freundlich model, illustrating a monolayer adsorption process for Pb(II) onto NiFe2O4/MnO2. Meanwhile, the NiFe2O4/MnO2was easily separated from the solution by an external magnet within a short period of time and still exhibited almost 80% removal capacity after six regenerations. The NiFe2O4/MnO2is expected to be a new promising adsorbent for heavy metal removal.
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: bxiangbo@tongji.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Xiang
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Ling
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China.
authors.forename: Han
authors.initials: H
authors.lastname: Lou
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: hongbogu2014@tongji.edu.cn.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Gu
keywords: Hydrothermal; Magnetic separation; NiFe(2)O(4)/MnO(2); Pb(II) removal; Regeneration