Open AccessNanocomposite of γ-Fe2O3 immobilized on graphene oxide for remediation of Ni(II) ions - kinetics, isotherm and thermodynamics studies
Author(s) -
Ubhi Manpreet Kaur,
Manpreet Kaur,
Dhanwinder Singh,
JeanMarc Grenèche
Publication year - 2017
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac1704247k
Subject(s) - adsorption , freundlich equation , nanocomposite , materials science , nanosheet , oxide , graphene , langmuir , chemical engineering , kinetics , langmuir adsorption model , nanotechnology , chemistry , organic chemistry , metallurgy , physics , quantum mechanics , engineering
Facile sonication method was used to immobilize γ-Fe2O3 nanoparticles (NPs) on graphene oxide (GO) to\udobtain environmentally stable γ-Fe2O3-GO nanocomposite (NC). Structure, surface morphology and composition of NC were thoroughly studied. Mössbauer analysis confirmed the presence of maghemite (γ-Fe2O3) as dominant phase of iron oxide. TEM images of NC revealed homogeneous distribution of γ-Fe2O3 NPs over the GO nanosheet. A comparative analysis of GO, γ-Fe2O3 NPs and NC for the removal of Ni(II) ions from water was carried out by batch method and adsorption kinetics, thermodynamics and isotherms were also studied. The adsorption data fitted better to Langmuir and Freundlich adsorption isotherms as compared to Dubinin Radushkevich (D-R) and Temkin adsorption isotherms. NC showed higher qmax value (615.0 mg/g) as compared to the pristine GO (403.7 mg/g) and γ-Fe2O3 NPs (572.4 mg/g). The adsorption kinetics followed pseudo-second-order model. NC displayed greater affinity for Ni(II) ions in comparison to pristine GO and γ-Fe2O3 NPs. The results suggested that the synthesized γ-Fe2O3-GO nanocomposite can be used as a promising novel material for the removal of Ni(II) from water due to its higher adsorption capacity, stability, convenient magnetic separation and regeneration