期刊
APPLIED SCIENCES-BASEL
卷 10, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/app10186477
关键词
hexavalent chromium; sorption; sorption isotherm; sorption kinetics; pseudo first order model; pseudo second order model; sorption thermodynamics
类别
资金
- VALERE VAnviteLli pEr la RicErca PROGRAMME - University of Campania Luigi Vanvitelli
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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