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Removal of chromium ions form aqueous solutions by adsorption on activated carbon and char

TitoloRemoval of chromium ions form aqueous solutions by adsorption on activated carbon and char
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2007
AutoriDi Natale, F., Lancia A., Molino Antonio, and Musmarra D.
RivistaJournal of Hazardous Materials
Volume145
Paginazione381-390
ISSN03043894
Parole chiaveActivated carbon, Adsorption, Adsorption capacity, Analytical, aqueous solution, article, binding competition, carbon, Charcoal, Chemical, chemistry, Chromium, Coal, heavy metal removal, Hydrogen-Ion Concentration, ion, isotherm, Multicomponent competitive adsorption, oxidation reduction reaction, pH, pH effects, pH measurement, redox conditions, Redox reactions, Reduction, removal experiment, Salinity, Solutions, sorbent, South Africa, surface property, Wastewater treatment, Water Pollutants
Abstract

Adsorption isotherms of chromium ions in aqueous solution have been experimentally measured on a granular activated carbon (GAC) and on a char of South African coal (CSAC). Experimental results show that the adsorption capacity for the GAC strongly depends on solution pH and salinity, with maximum values around 7 mg/g at neutral pH and low salinity levels. On the contrary, the CSAC shows a smaller adsorption capacity, near 0.3 mg/g, which slightly decreases by increasing pH and salinity levels. Chromium adsorption mainly depends on the availability of chromium ions in solution and on the occurrence of redox reactions between the surface groups and the Cr(VI) which lead to the formation of Cr(III). The reduction of Cr(VI) and the following sorption of Cr(III) cations appears as the leading mechanism for chromium uptake on the CSAC. A similar behaviour can be observed for the GAC at pH below 3. On the contrary, at pH > 7, the multicomponent competitive adsorption of Cr(VI), OH - and Cl - has to be considered. © 2006 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-34250343855&doi=10.1016%2fj.jhazmat.2006.11.028&partnerID=40&md5=1b22004de664ecc7c385f7d4b0f1dd72
DOI10.1016/j.jhazmat.2006.11.028
Citation KeyDiNatale2007381