Fabrication of novel magnetic chitosan/graphene-oxide/metal oxide nanocomposite beads for Cr(VI) adsorption
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Composites containing magnetic chitosan chloride, graphene oxide and one of three different metal oxides (MnO2, Al2O3 and SiO2) were synthesised in the morphological form of beads and applied in removing Cr(VI) species in solution. The composites were successfully characterised using IR, XRD, TGA, DSC and SEM. Adsorption studies were carried out by varying pH, concentration, temperature and time. Maximum adsorptions of 78.2, 77.8 and 75.9 mg g−1 for each composite bead occurred at pH 2 and at 298 K. Adsorption followed the Langmuir isotherm, with a pseudo-second-order kinetic model. Thermodynamic studies proved that adsorption occurred spontaneously with the process being exothermic. The Cr(VI) species were desorbed from the beads using NaOH and the beads could be regenerated over six cycles.
KeywordsFunctionalization of polymers Adsorption Porous materials Recycling Morphology
This work was funded by the National Research Foundation (NRF), South Africa (Grant #95799), and the Eskom TESP Programme (Grant #P677). Microscopy images were taken by the Microscopy and Microanalysis Unit (MMU) at the University of Kwa Zulu-Natal.
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