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Defluoridation of water using calcium aluminate material

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Title Defluoridation of water using calcium aluminate material
 
Creator Sakhare, Nikita
Lunge, S
Rayalu, Sadhana
Bakardvija, S
Subrt, J
Devotta, Sukumar
Labhsetwar, Nitin
 
Subject Materials Science
 
Description 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.
 
Publisher Elsevier
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1070/1/sakhare2012.pdf
Sakhare, Nikita and Lunge, S and Rayalu, Sadhana and Bakardvija, S and Subrt, J and Devotta, Sukumar and Labhsetwar, Nitin (2012) Defluoridation of water using calcium aluminate material. Chemical Engineering Journal, 203. pp. 406-414. ISSN 1385-8947
 
Relation http://neeri.csircentral.net/1070/