Defluoridation of water using calcium aluminate material

0387987 - ÚACH 2013 RIV NL eng J - Journal Article
Sakhare, N. - Lunge, S. - Rayalu, S. - Bakardjieva, Snejana - Šubrt, Jan - Devotta, S. - Labhsetwar, N.
Defluoridation of water using calcium aluminate material.
Chemical Engineering Journal. Roč. 203, SEPTEMBER (2012), s. 406-414. ISSN 1385-8947. E-ISSN 1873-3212
R&D Projects: GA MŠMT LC523
Institutional support: RVO:61388980
Keywords : Defluoridation * Fluorosis * Adsorption * Fluoride removal * Calcium aluminate
Subject RIV: CA - Inorganic Chemistry
Impact factor: 3.473, year: 2012

A new calcium aluminate (CA) type material has been synthesized using combustion method, which offers formation of smaller particles with open pores. The material thus synthesized has been studied for its fluoride uptake properties in simulated and actual drinking waters, containing fluoride as well as other co-anions. The adsorbent shows high adsorption capacity for fluoride and it is possible to effectively remove fluoride to the tune of 85% from initial concentration of 8.9 mg L-1 and using a dose of 3 g L-1. Kinetics of the adsorption system has been studied indicating that the intra-particle diffusion contributes to the rate determining step. The experimental data fitted well into Langmuir adsorption isotherm and follows pseudo-second-order kinetics. The thermodynamic parameters suggest the complex nature of fluoride uptake reaction, dominated by chemisorption. These studies also infer that fluoride adsorption on CA is spontaneous and an endothermic process. The effective regeneration was achieved by treating the fluoride loaded material by NaOH and H2SO4. CA show potential for defluoridation of water, especially in presence of other anions, when selectivity for fluoride is of prime importance. This class of material suggest the possibility of tailoring of their properties and therefore, likely to attract for attention for defluoridation of water.
Permanent Link: http://hdl.handle.net/11104/0217028