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Carboxymethylated tamarind (CMT) has been synthesized by reacting tamarind kernel powder (TKP) with sodium salt of monochloro acetic acid (SMCA) in the presence of sodium hydroxide. This new material was characterized by a variety of materials characterization techniques, namely intrinsic viscosity measurement, FTIR spectroscopy, 13C NMR spectra, thermal studies (TGA and DTA), static light scattering (SLS) technique for determination of weight average molecular weight and elemental analysis (C, H, N and O). The material thus developed was studied for its suitability as a matrix for controlled drug delivery. The kinetics of Drug release was also undertaken. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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A B S T R A C TThe article reports on an investigation into the ability of zirconium (IV)-loaded carboxylated orange peel to remove the fluoride ion from drinking water and the parameters involved in this process. Various spectroscopic and microscopic techniques were used to characterize the adsorbent. The results suggested that the adsorbent exhibited reasonably significant fluoride removal over a wide range of pH value (3.0-8.0). The kinetic studies indicated that the adsorption process followed pseudo-second-order model. The adsorption isotherm has been modeled by the Langmuir, Freundlich, Temkin, and DR equation. The adsorption isotherm was well described by DR equation. The negative value of ΔG˚and positive value of ΔH˚revealed that the adsorption process was spontaneous and endothermic. The presence of NO À 3 , Cl − , and SO 2À 4 ions have negligible effect, whereas PO 3À 4 and HCO À 3 retarded the fluoride removal capacity to some extent. The reuse study of the adsorbent resulted in retention of 83% capacity in 8th cycle. Desorption studies showed that the fluoride can easily be desorbed by using 0.1 N NaOH solution. The wide pH range, second-order kinetics, operation at normal temperature, high adsorption capacity, and good recycle potential of the new adsorbent would make it an ideal material for the removal of fluoride from drinking water.

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