Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/app10186477
Keywords
hexavalent chromium; sorption; sorption isotherm; sorption kinetics; pseudo first order model; pseudo second order model; sorption thermodynamics
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Funding
- VALERE VAnviteLli pEr la RicErca PROGRAMME - University of Campania Luigi Vanvitelli
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Hexavalent chromium (Cr(VI)) in water systems is a major hazard for living organisms, including humans. The most popular technology currently used to remove Cr(VI) from polluted water is sorption for its effectiveness, ease of use, low cost and environmental friendliness. The electrostatic interactions between chromium species and the sorbent matrix are the main determinants of Cr(VI) sorption. The pH plays a central role in the process by affecting chromium speciation and the net charge on sorbent surface. In most cases, Cr(VI) sorption is an endothermic process whose kinetics is satisfactorily described by the pseudo second-order model. A critical survey of the recent literature, however, reveals that the thermodynamic and kinetic parameters reported for Cr(VI) sorption are often incorrect and/or erroneously interpreted.
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