title: One-pot synthesis of magnetic Ni@Mg(OH)2 core-shell nanocomposites as a recyclable removal agent for heavy metals.
abstract: A surfactant-assisted hydrothermal route has been presented to one-pot synthesized Ni nanoparticles encapsulated in Mg(OH)2 hollow spheres. The diameter of Ni cores and the thickness of Mg(OH)2 shells are about 60-80 and 15 nm, respectively, and the size of a whole composite sphere is approximately 70-100 nm. Benefiting from the ferrimagnetic behavior of Ni cores and the high surface area of Mg(OH)2 shells, Ni@Mg(OH)2 nanocomposites exhibit excellent heavy metals adsorption capacity and recyclable property. The first removal efficiency is almost 100% for target metals, and after five cycles, the adsorption capacity remains 95%. A series of experiments show the adsorption of heavy metal ions on Ni@Mg(OH)2 follows a pseudo-second order kinetic equation and can be described by a Langmuir isotherm model.
authors.affiliation: School of Materials Science and Engineering, Henan University of Technology , Zhengzhou, 450007, P. R. China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Weiqiang
authors.initials: W
authors.lastname: Song
authors.forename: Qiuling
authors.initials: Q
authors.lastname: Chen
authors.forename: Baoji
authors.initials: B
authors.lastname: Miao
authors.forename: Weichun
authors.initials: W
authors.lastname: He
keywords: Ni@Mg(OH)2 nanocomposites; heavy metal wastewater; magnetic separation; one-pot synthesis; recyclability