Abstract
A novel magnetic composite bioadsorbent composed of chitosan wrapping magnetic nanosized γ-Fe 2O 3 and multi-walled carbon nanotubes (m-CS/γ-Fe 2O 3/MWCNTs) was prepared under relative mild conditions and was characterized. Adsorption of methyl orange (MO) onto m-CS/γ-Fe 2O 3/MWCNTs was investigated with respect to pH, initial MO concentration, coexisting anions and temperature. Results of characterizations indicated that magnetic nanosized γ-Fe 2O 3 and MWCNTs have been wrapped by crosslinked chitosan. Introduction of MWCNTs could obviously increase the adsorption capacity ( q e ) of MO onto bioadsorbent by 2.2 times. Kinetics data and adsorption isotherm were better fitted by pseudo-second-order kinetic model and by Langmuir isotherm, respectively. Values of activation parameters such as free energy (△ G°), enthalpy (△ H°) and entropy (Δ S°) were determined as 3.15–3.78 kJ mol −1, −9.94 kJ mol −1 and −20.65 J mol −1 k −1, respectively, indicating that the adsorption was feasible, spontaneous and exothermic process in nature. After adsorption, m-CS/γ-Fe 2O 3/MWCNTs could be effectively and fleetly separated by applying a magnetic field.
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