Title
Adsorption of chromium from aqueous solution by activated alumina and activated charcoal Adsorption of chromium from aqueous solution by activated alumina and activated charcoal
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Barking
Subject
Physics
Biology
Engineering sciences. Technology
Source (journal)
Bioresource technology. - Barking
Volume/pages
98(2006) :4 , p. 954-957
ISSN
0960-8524
0960-8524
ISI
000242063400035
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Cr(VI) is considered to be potentially carcinogenic to humans. Removal of Cr(VI) ions from aqueous solution under different conditions was investigated using activated alumina (AA) and activated charcoal (AC) as adsorbents. Batch mode experiments were conducted to study the effects of adsorbent dose, contact time, pH, temperature and initial concentration of Cr(VI). Results showed that the adsorption of Cr(VI) depended significantly on pH and temperature. Equilibrium studies showed that Cr(VI) had a high affinity for AA at pH 4 and AC at pH 2. For AA, maximum adsorption was found at 25 degrees C, indicating exothermic adsorption, while for AC, maximum adsorption was at 40 degrees C. Freundlich and Langmuir adsorption isotherms were also applied and they showed good fits to the experimental data. The results suggest that both AA and AC could be used as effective adsorbents for the removal of Cr(VI) ions. (c) 2006 Elsevier Ltd. All rights reserved.
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