Nanocrystalline magnesia alumina mixed oxide: efficient defluoridation sorbent
by R. Shukla, Jayshree Ramkumar, A.K. Tyagi
International Journal of Nanotechnology (IJNT), Vol. 7, No. 9/10/11/12, 2010

Abstract: Nanocrystalline magnesia-alumina mixed oxide (Mg_0.80Al_0.20O_1.10) prepared by combustion synthesis method was found to be an excellent sorbent for uptake of fluoride anion of up to 120 mg L⁻¹ concentration. The sorption was achieved at a pH of 6 with 0.015 g of oxide and maximum uptake could be achieved within a period of 1 h. The sorption followed both Langmuir and Freundlich isotherms with a maximum sorption capacity of 10 mg/g of fluoride. The uptake is a particle diffusion controlled process following pseudo second order kinetics with a rate constant of 0.0519 g mg⁻¹ min⁻¹.

Online publication date: Tue, 17-Aug-2010

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