Abstract
Aluminum and lanthanum binary oxyhydroxides on chitosan template (CS@ALMOH) was synthesized by greener in-situ one-pot method for defluoridation of drinking water. Characterization by FTIR, XPS, TGA/DSC and SEM with EDAX revealed that the material was a composite of chitosan and aluminum–lanthanum with primary particle size of micrometer level. The prepared material shows relatively fast adsorption kinetics to fluoride removal within 15min, good adsorption capacity with wide pH ranges of 3–9 and selectivity. The mechanism of fluoride removal using the synthesized materials were by both electrostatic interaction as well as ion-exchange. Equilibrium sorption results were well described by Freundlich, Langmuir and D–R isotherms and the sorption capacities were approximately 49.54mg/g for CS@ALMOH and 33.39mg/g for ALMOH. The sorption process follows pseudo-second-order and intraparticle diffusion kinetic models. This bifunctional adsorbent with aluminum and lanthanum oxyhydroxides impregnated onto chitosan polymeric matrix exhibits a pronounced fluoride adsorption capacity over already reported materials in the literature and the resulting CS@ALMOH material can be used in a broad pH range, which suggests its great potential for the decontamination of fluoride polluted water. The suitability of the CS@ALMOH material has been tested with the field samples collected in a nearby fluoride endemic area.
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