Issue 10, 2013

Synthesis of nickel hierarchical structures and evaluation on their magnetic properties and Congo red removal ability

Abstract

Novel nickel hierarchical structures were prepared through a facile one-pot solvothermal approach in the presence of surfactant and mineralizer. The influence of dynamics factors such as polyvinylpyrrolidone (PVP) content, ratio (R) between NaF and NH3·H2O on the morphologies of the as-synthesized products were investigated in detail. By regulating the dynamics factors, nickel crystals with three different structures (hcp and fcc mixture structure, fcc structure and a mostly hcp structure) were synthesized. Meanwhile, the corresponding morphologies are changed from hierarchical structures composed of nanoparticles to hierarchical structures consisted of nanoflakes, and to polyhedra. The values of saturation magnetizations of nickel crystals also range from 41.6 to 8 emu g−1 because of the change of crystal structure from fcc to mostly hcp. One thing to be mentioned is that the mostly hcp phase can be completely converted into fcc phase if the solvothermal treatment temperature is further enhanced to 220 °C. Further, the Congo red (CR) removal ability by the as-obtained nickel particles was evaluated. By the investigation of adsorption and desorption experiments on nickel powders, we can ascertain that chemical reduction and physical adsorption happen at the same time during the treatment process of CR solution.

Graphical abstract: Synthesis of nickel hierarchical structures and evaluation on their magnetic properties and Congo red removal ability

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2012
Accepted
04 Dec 2012
First published
06 Dec 2012

Dalton Trans., 2013,42, 3660-3666

Synthesis of nickel hierarchical structures and evaluation on their magnetic properties and Congo red removal ability

G. Zhang and L. Zhao, Dalton Trans., 2013, 42, 3660 DOI: 10.1039/C2DT32268D

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