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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Adsorption equilibrium modeling and solution chemistry dependence of fluoride removal from water by trivalent-cation-exchanged zeolite F-9
Journal of Colloid and Interface Science, Volume 279, No. 2, Year 2004
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Description
Fluoride in drinking water above permissible levels is responsible for human dental and skeletal fluorosis. In this study, therefore, the large internal surface area of zeolite was utilized to create active sites for fluoride sorption by exchanging Na +-bound zeolite with Al 3+ or La 3+ ions. Fluoride removal from water using Al 3+- and La 3+-exchanged zeolite F-9 particles was subsequently investigated to evaluate the fluoride sorption characteristics of the sorbents. Equilibrium isotherms such as the two-site Langmuir (L), Freundlich (F), Langmuir-Freundlich (LF), Redlich-Peterson (RP), Tóth (T), and Dubinin-Radushkevitch (DR) were successfully used to model the experimental data. Modeling results showed that the isotherm parameters weakly depended on the solution temperature. From the DR isotherm parameters, it was considered that the uptake of fluoride by Al 3+-exchanged zeolite proceeded by an ion-exchange mechanism (E=11.32-12.13 kJ/mol), while fluoride-La 3+-exchanged zeolite interaction proceeded by physical adsorption (E=7.41-7.72 kJ/mol). Factors from the solution chemistry that affected fluoride removal from water were the solution pH and bicarbonate content. The latter factor buffered the system pH at higher values and thus diminished the affinity of the active sites for fluoride. Natural groundwater samples from two Kenyan tube wells were tested and results are discussed in relation to solution chemistry. In overall, Al 3+-exchanged zeolite was found to be superior to La 3+-exchanged zeolite in fluoride uptake within the tested concentration range. © 2004 Elsevier Inc. All rights reserved.
Authors & Co-Authors
Onyango, Maurice Stephen
Japan, Nagoya
Nagoya University
Kojima, Yoshihiro
Japan, Nagoya
Nagoya University
Ochieng, Aoyi
Kenya, Eldoret
Moi University
Bernardo, Eileen C.
Japan, Nagoya
Nagoya University
Matsuda, Hitoki
Japan, Nagoya
Nagoya University
Statistics
Citations: 578
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1016/j.jcis.2004.06.038
ISSN:
00219797
Research Areas
Environmental
Health System And Policy