title: Evolution of nickel sulfide hollow spheres through topotactic transformation.
abstract: In this study, a topotactic transformation route was proposed to synthesize single-crystalline β-NiS hollow spheres with uniform phase and morphology evolving from polycrystalline α-NiS hollow spheres. Uniform polycrystalline α-NiS hollow spheres were firstly prepared with thiourea and glutathione as sulfur sources under hydrothermal conditions through the Kirkendall effect. By increasing the reaction temperature the polycrystalline α-NiS hollow spheres were transformed to uniform β-NiS hollow spheres. The β-NiS crystals obtained through the topotactic transformation route not only have unchanged morphology of hollow spheres but are also single-crystalline in nature. The as-prepared NiS hollow spheres display a good ability to remove the organic pollutant Congo red from water, which makes them have application potential in water treatment.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China. qylu@nju.edu.cn.
authors.forename: Chengzhen
authors.initials: C
authors.lastname: Wei
authors.forename: Qingyi
authors.initials: Q
authors.lastname: Lu
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Feng
authors.initials: F
authors.lastname: Gao