Equilibrium Studies of Fluoride Adsorption onto a Ferric Poly−mineral from Kenya.

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dc.contributor.author Wambui, Enos W.
dc.contributor.author Onindo, Charles O.
dc.contributor.author Ambusso, Willis
dc.contributor.author Muthakia, Gerald Kanyago
dc.date.accessioned 2013-08-05T15:37:01Z
dc.date.available 2013-08-05T15:37:01Z
dc.date.issued 2012
dc.identifier.uri http://hdl.handle.net/123456789/59
dc.description Abstract. en_US
dc.description.abstract African countries along the Great Rift Valley are among areas of the world where excess fluoride in water sources is a major public health problem. In this work, the removal of fluoride (F) from water solutions using a ferric poly-mineral (FPM) from Kenya was therefore studied using batch adsorption experiments. The effect of change in solution pH, temperature, initial oncentration of F, mass of FPM, contact time and presence of various competing ions on F adsorption onto FPM was evaluated. Adsorption isotherms were then applied to the adsorption data to characterize and establish the adsorption capacity of the mineral. The adsorption of F onto FPM was found to be a fast process and, at 1000 mg/L initial F concentration at pH 3.32 and 293 K and using 0.2 g/mL adsorbent dosage, over 90% F removal from solution could be achieved in 30 min. Based on Giles system of classification of adsorption isotherms, F adsorption isotherm conformed to L4 Langmuirtype isotherms. This indicated that FPM is composed of a heterogeneous surface consisting of sites which, during adsorption, filled-up with F ions in succession. The adsorption data also correlated to Langmuir and Freundlich models indicating that F adsorption onto FPM was a mixed process involving chemisorptions onto surface sites followed by gradual intra-particle penetration of F into mesoporous structure of the mineral. High mean Langmuir adsorption capacity of 10.8 mg/g, indicate that the mineral could be of use as an inexpensive substrate for the removal of F from aqueous streams. en_US
dc.description.sponsorship 1 Department of Chemistry, Kenyatta University, P.O. Box 43844 -00100, Nairobi, Kenya 2 Department of Chemistry, Bondo University College, P.O. Box 210 -40601, Bondo, Kenya 3 Department of Physics, Kenyatta University, P.O. Box 43844 -00100, Nairobi, Kenya. 4 Department of Chemistry, Kimathi University College of Technology, P.O. Box 657 10100, Nyeri, Kenya. en_US
dc.language.iso en en_US
dc.publisher J. Appl. Sci. Environ. Manage en_US
dc.subject Adsorption isotherms en_US
dc.subject Equilibrium analysis en_US
dc.subject Ferric poly−mineral en_US
dc.subject Fluoride adsorption en_US
dc.subject Water fluoride en_US
dc.title Equilibrium Studies of Fluoride Adsorption onto a Ferric Poly−mineral from Kenya. en_US
dc.type Article en_US

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