Title: Nanocrystalline magnesia alumina mixed oxide: efficient defluoridation sorbent

Authors: R. Shukla, Jayshree Ramkumar, A.K. Tyagi

Addresses: Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. ' Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. ' Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

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.

Keywords: nanocrystalline; magnesium aluminium mixed oxide; sorption; fluoride removal; defluoridation sorbents; nanotechnology.

DOI: 10.1504/IJNT.2010.034704

International Journal of Nanotechnology, 2010 Vol.7 No.9/10/11/12, pp.989 - 1002

Published online: 17 Aug 2010 *

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