Abstract
A reclaimable mesoporous adsorbent of γ-Al2O3/γ-Fe2O3 nanocomposite was prepared by microwave irradiation method for fluoride removal from aqueous solution. The chemical constituent and morphology of adsorbent were characterized by XRD, XPS, SEM, and FTIR, and the pore structure and surface area were calculated using BET analyses. BET study revealed surface area is 203.24 m2/g. The adsorbent was superparamagnetic with a saturation magnetization of 27.52 emu/g at 300 K, which improves the magnetic separation of adsorbent using an external magnet. The batch of adsorption experiments was studied to evaluate fluoride removal capacity. The adsorption isotherm follows Langmuir isotherm than Freundlich isotherm, and the maximum adsorption capacity is 105.042 mg/g. The adsorption equilibrium reached within 15 min. The adsorption kinetic well defined by the pseudo-second-order model. Adsorption mechanism study suggested Al3+ ions on the surface of the adsorbent interact with fluoride molecules. Up to the fifth cycle, the adsorbent retains 95 % removal capacity.
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