Preparation and Characterization of Chitosan-Coated Diatomaceous Earth for Hexavalent Chromium Removal

Preparation and Characterization of Chitosan-Coated Diatomaceous Earth for Hexavalent Chromium... A novel chitosan coated diatomaceous earth (CDE) beads were prepared by the drop-wise method and characterized by Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and zeta potential. Prepared CDE beads were used for Cr(VI) adsorption from aqueous systems. The effect of several factors including solution-pH, initial Cr(VI) concentration, temperature, and contact time on adsorption process was examined. The adsorption results revealed that the Cr(VI) adsorption was fitting well the Langmuir model indicating a homogeneous adsorption surface for Cr(VI) on the CDE beads. The kinetics of adsorption suggested a pseudo-second-order model fitting better than the pseudo-first-order model. The maximum Cr(VI) adsorption capacity onto prepared CDE beads was 84.23 mg/g. In competition adsorption, the affinity of CDE beads toward mixed metal ions was high for Cr(VI) followed by Pb(II) and it was low for Zn(II) and Ni(II). Loaded CDE beads with Cr(VI) were successfully regenerated by NaOH and reused up to five cycles. The overall results emphasize that the CDE beads could be used as an economically applicable and sustainable adsorbent for Cr(VI) removal from aqueous solutions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Processes Springer Journals

Preparation and Characterization of Chitosan-Coated Diatomaceous Earth for Hexavalent Chromium Removal

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Publisher
Springer International Publishing
Copyright
Copyright © 2017 by Springer International Publishing AG, part of Springer Nature
Subject
Earth Sciences; Environmental Science and Engineering; Environmental Management; Waste Management/Waste Technology; Water Quality/Water Pollution
ISSN
2198-7491
eISSN
2198-7505
D.O.I.
10.1007/s40710-017-0280-5
Publisher site
See Article on Publisher Site

Abstract

A novel chitosan coated diatomaceous earth (CDE) beads were prepared by the drop-wise method and characterized by Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and zeta potential. Prepared CDE beads were used for Cr(VI) adsorption from aqueous systems. The effect of several factors including solution-pH, initial Cr(VI) concentration, temperature, and contact time on adsorption process was examined. The adsorption results revealed that the Cr(VI) adsorption was fitting well the Langmuir model indicating a homogeneous adsorption surface for Cr(VI) on the CDE beads. The kinetics of adsorption suggested a pseudo-second-order model fitting better than the pseudo-first-order model. The maximum Cr(VI) adsorption capacity onto prepared CDE beads was 84.23 mg/g. In competition adsorption, the affinity of CDE beads toward mixed metal ions was high for Cr(VI) followed by Pb(II) and it was low for Zn(II) and Ni(II). Loaded CDE beads with Cr(VI) were successfully regenerated by NaOH and reused up to five cycles. The overall results emphasize that the CDE beads could be used as an economically applicable and sustainable adsorbent for Cr(VI) removal from aqueous solutions.

Journal

Environmental ProcessesSpringer Journals

Published: Dec 29, 2017

References

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