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Defluoridation of drinking water using chitin, chitosan and lanthanum-modified chitosan

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Title Defluoridation of drinking water using chitin, chitosan and
lanthanum-modified chitosan
 
Creator Kamble, Sanjay P
Jagtap, Sneha
Labhsetwar, Nitin
Thakare, Dilip
Godfrey, Samuel
Devotta, S
Rayalu, S
 
Subject Materials Science
 
Description Chitin, a naturally occurring abundant biopolymer, and its deacetylated product chitosan has been widely used for metal adsorption from water
and wastewaters, but the application of these materials as an adsorbent to remove fluoride from drinking water has seldom been explored. In
this work the applicability of chitin, chitosan and 20%-lanthanum incorporated chitosan (20% La-chitosan) as adsorbents for the removal of
excess fluoride from drinking water was studied. The effects of various physico-chemical parameters such as pH, adsorbent dose, initial fluoride
concentration and the presence of interfering ions on adsorption of fluoride were studied. It was observed that the uptake of fluoride was maximum
at original pH (pH 6.7). The equilibrium adsorption data were fitted reasonably well for Freundlich isotherm model. The presence of chloride,
sulfate, carbonate and bicarbonate ions in drinking water greatly affect the uptake of fluoride indicating that these anions compete with sorption
of fluoride on 20% La-chitosan. The rate of adsorption was rapid and maximum fluoride uptake was attained within 20 min. The mechanism of
adsorption of fluoride on lanthanum-modified chitosan is also explained. The comparison of uptake of fluoride in distilled water and field water
shows relatively higher uptake of fluoride in distilled water. This could be due to the competing effect of other anions present and higher pH of the
field water.
 
Publisher Elsevier
 
Date 2007-05
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/993/1/kamble2007.pdf
Kamble, Sanjay P and Jagtap, Sneha and Labhsetwar, Nitin and Thakare, Dilip and Godfrey, Samuel and Devotta, S and Rayalu, S (2007) Defluoridation of drinking water using chitin, chitosan and lanthanum-modified chitosan. Chemical Engineering Journal, 129 (1-3). pp. 173-180. ISSN 2213-3437
 
Relation http://www.sciencedirect.com/science/article/pii/S1385894706004578
http://neeri.csircentral.net/993/