| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 221760 | Journal of Environmental Chemical Engineering | 2014 | 11 Pages |
•Magnetic chitosan–graphene oxide composite (CGM) is synthesized, characterized and used for Cr(VI) removal.•CGM has very high adsorption capacity for Cr(VI).•The composite material can be magnetically separable from the solution and can be reused for 5th cycle of regeneration.•Performances of CGM in Cr(VI) removal are investigated by designing single stage batch adsorber.
A magnetically modified graphene oxide–chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (±0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich–Peterson isotherms describe the experimental data. Negative ΔG° (−15.49 to −15.67 kJ mol−1) with positive ΔH° (11.29 kJ mol−1) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity ˜92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L−1.
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