Physico-chemical studies on synthesized graphene oxidemagnesium ferrite based nanocomposites and their adsorption potential for Ni (II) ion
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Role of magnetic nanocomposites for the remediation of waste-water is a thrust area of research.
In the present study, hybrid graphene oxide (GO) based inverse spinel magnesium ferrite
(MgFe2O4) nanocomposites (NCs) with bentonite/charcoal/chitosan were synthesized using facile
sonication method. p-XRD patterns confirmed the presence of spinel ferrite phase in the NCs with
the crystalline size 8-32 nm. FT-IR spectra displayed absorption bands corresponding to GO,
MgFe2O4 NPs and bentonite/charcoal/chitosan in the NCs along with red shift of bands
corresponding to C=O, C=C and O-H stretching. TGA confirmed higher stability of NCs over
pristine GO. MgFe2O4 NPs imparted appreciable saturation magnetization to the NCs (4.03-11.10
emug-1). SEM and TEM revealed high porosity and immobilization of clusters of MgFe2O4 NPs
onto GO sheets in the NCs. BET surface area of the NCs ranged from 58.34 to 165.29 m2g-1 and
was markedly higher than pristine MgFe2O4 NPs. Removal of Ni (II) ions was studied by batch
adsorption method. Langmuir, Temkin and Freundlich models were followed in perfect way.
Maximum adsorption capacity from Langmuir model ranged between71.43-111.11 mgg-1 for
NCs. Kinetic data fitted pseudo-second-order equation. Thermodynamic parameters revealed
spontaneous and endothermic removal using NCs; whereas using GO the removal was
exothermic. Percentage removal of Ni (II) was maximum for MgFe2O4 NPs and their binary NCs
with GO. Effect of co-existing ions on Ni (II) adsorption was studied in Pb-Cd-Ni-Zn system.
NCs possessed higher removal potential for Pb (II) as compared to Ni (II) due to the lower
hydration energy of the former. For electroplating waste-water the optimum adsorbent dose
required for complete metal ion removal was higher than that for spiked water because of
presence of other interfering ions.
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