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Fabrication of La3+ Impregnated Chitosan/β-Cyclodextrin Biopolymeric Materials for Effective Utilization of Chromate and Fluoride Adsorption in Single Systems

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journal contribution
posted on 23.01.2018, 14:22 by Jayaram Preethi, Sankaran Meenakshi
Lanthanum impregnated chitosan/β-cyclodextrin (CS–La−βCD) composite was prepared using a facile in situ fabrication method and successfully evaluated for the adsorption of CrO42– and F. The pristine and treated CS–La−βCD was characterized using Fourier transform infrared, scanning electron microscopy, energy dispersive X-ray spectroscopy with mapping, X-ray diffraction, and thermal gravametric analytical techniques. The optimum conditions for the uptake of CrO42– and F were investigated as a function of shaking time, dosage, initial ion concentration, pH, and predatory ions in batch experiments. The equilibrium data were fitted using Langmuir, Freundlich, and Dubinin–Radushkevich models for the defluoridation and sorption of chromium onto CS–La−βCD. The adsorption kinetics of CrO42– and F followed the pseudo-second order model. The maximum Langmuir adsorption capacity was found to be 91.58 mg/g and 8.14 mg/g for CrO42– and F, respectively at 303 K. Sequential adsorption and desorption studies were carried out up to five cycles using 0.1 M of NaOH as an eluent to check the reusability of the adsorbents.