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- Title
Removal of chromium (VI) from aqueous solutions using activated carbon prepared from crofton weed.
- Authors
Ping Wang; Runhu Zhang; Chao Hua
- Abstract
Activated carbon from crofton weed (ACCW) was evaluated for its ability to remove Cr(VI) from aqueous solutions. Batch experiments were used to examine kinetics, adsorption isotherm, pH effect, and thermodynamic parameters. Adsorption data for Cr(VI) uptake by ACCW were analyzed according to Langmuir and Freundlich adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293, 303, and 313K (ΔH° = 15.02 kJ mol-1;ΔG° =-0.76 to -2.91 kJ mol-1 and ΔS° = 53.85 JK-1 mol-1). The ΔG° values obtained were negative, indicating that the adsorption of Cr(VI) on the surface of ACCW was a spontaneous adsorption process. The kinetics of this process was described very well by a pseudo-second-order rate equation. These results show that the ACCW could be considered as a potential adsorbent for Cr(VI) in aqueous solutions.
- Subjects
CHROMIUM removal (Sewage purification); AQUEOUS solutions; THERMODYNAMICS; ADSORPTION (Chemistry); HEXAVALENT chromium
- Publication
Desalination & Water Treatment, 2013, Vol 51, Issue 10-12, p2327
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2012.735402