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Abstract
In the present study nano calcium-aluminum mixed oxide material (NCAMO) was synthesized by solution combustion method in 1:1, 1:2, 4:1, 3:2 molar ratios of calcium and aluminum nitrates as oxidizers and urea as fuel for an efficient adsorption of fluoride from drinking water. Molar composition of 1:1 ratio was found to exhibit better adsorption properties and the same was characterized by XRD, FESEM, and FTIR. The optimized conditions for maximum adsorption capacity were achieved at pH4 with contact time of 4 hours by adding 1 g/L of NCAMO to initial fluoride concentration of 8 mg/L. The sorption of fluoride on NCAMO followed Langmuir isotherm model strongly suggested monolayer adsorption. The calculated equilibrium adsorption capacity 23.7 mg/g of NCAMO strongly suggests the dominance of monolayer adsorption process. The adsorption kinetics was well described by pseudo-second order equation confirming chemisorption.