Novel adsorbents possessing cumulative sorption nature evoked from Al2O3 nanoflakes, C.urens seeds active carbon and calcium alginate beads for defluoridation studies

Nano Al2O3 flakes are synthesized and loaded on H3PO4 activated carbon prepared from the seeds of C.urens and thus obtained composite is immobilized in Ca-alginate beads with an aim to derive combined advantage of sorption nature of active carbon and nanoflakes of Al2O3. The adsorbents are characterized and their de-fluoridation abilities are 4.1 mg/g for active carbon, 5.62 mg/g for nano Al2O3-active carbon composite and 9.09 mg/g for the beads. The adsorption nature, kinetics of adsorption and thermodynamic parameters are analyzed. The spent adsorbents can be regenerated. The methodologies are successfully applied to real water samples. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.