A magnetic fluid based on covalent-bonded nanoparticle organic hybrid materials (NOHMs) and its decolorization application in water

作者：Lin Kun Yi Andrew^*; Yang Hongta; Lee Wei Der; Tsao Kuan Yi

来源：Journal of Molecular Liquids, 2015, 204: 50-59.

DOI：10.1016/j.molliq.2015.01.020

• Nanoparticle organic hybrid materials
• Magnetic fluid
• Decolorization

Nanoscale organic hybrid materials (NOHMs) are surface-functionalized nanoparticles which can exhibit liquid-like behavior without addition of solvents. NOHMs can be prepared via grafting polymer chains to the surface of nanoparticle by ionic bonding or covalent bonding. While the ionic-bonded NOHMs have been investigated extensively, studies and applications of the covalent-bonded NOHMs are still limited. This study aims to examine the applicability of the covalent-bonded NOHMs in aqueous solutions. To facilitate separation of the covalent-bonded NOHMs from water, we developed this magnetic NOHMs fluid (MNF) and used it to decolorize dyes in water. This MNF was synthesized using gamma-Fe2O3 as a core and polyetheramine as polymer chains. The as-synthesized MNF was characterized by SQUID, TEM, FT-IR, XRD, rheometer and thermogravimetric analyzer. The decolorization of dye in water using MNF was demonstrated by removing Nile Blue dye from water. The dye removal capacity of MNF as a function of time was measured and analyzed using the pseudo first and second order rate laws as well as the intra-particle diffusion. In addition, the Langmuir isotherm appeared to satisfactorily represent the sorption isotherm data. The fluid and magnetically responsive MNF showed its potential applicability in aqueous solutions to expand the functionality and applications of covalent-bonded NOHMs.

• 出版日期2015-4