An excellent fluoride sorption behavior of modified amberlite resin.

The article describes a convenient method for the modification of Amberlite XAD-4 resin by introducing thio-urea binding sites onto the aromatic rings. The modified (ATU) resin has been employed for the quantitative sorption of fluoride ions in batch as well as column experiments. The parameters (i.e. pH, contact time, etc.) were optimized and desorption of fluoride ions was fulfilled by using 0.01 M HCl solution. The equation isotherms such as Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin were also successfully applied to model the experimental data. The sorption capacity of the ATU resin was found as 3.286 mmol g(-1). From the D-R isotherm parameters, it has been calculated that the uptake of fluoride ion by ATU resin occurs through ion exchange sorption mechanism. The study will contribute toward the remediation of fluoride polluted areas as well as in the various fields of materials science. 2009 Elsevier B.V. All rights reserved.