Results
Title

Adsorption of Chromium Ions by Acid Activated Low Cost Carbon-Kinetic,Thermodynamic and Equilibrium Studies.

Authors

Venkatraman, B. R.; Parthasarathy, S.; Kasthuri, A.; Pandian, P.; Arivoli, S.

Abstract

A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing metal ions. The process parameters studied include agitation time, initial metal ions concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 30 mg/g at an initial pH of 7.0. The temperature variation study showed that the metal ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the metal ion solutions. The Langmuir and Freundlich adsorption isotherms obtained, positive ∆H0 value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of metal ions on BBC involves chemisorption as well as physisorption mechanism.

Subjects

METAL ion absorption & adsorption; ACTIVATED carbon; ISOTHERMAL surfaces (Thermodynamics); SURFACE chemistry; THERMODYNAMIC potentials; THERMODYNAMIC equilibrium; CONCENTRATION functions; CHEMISORPTION; CHROMIUM ions

Publication

E-Journal of Chemistry, 2009, Issue S1, pS1

ISSN

0973-4945

Publication type

Academic Journal

DOI

10.1155/2009/134010