Adsorption of Chromium (VI) from Aqueous Solution by Acacia Tree (Acacia tortilis) Charcoal

Show simple item record Muriuki, Cecilia. W Mutwiwa, Urbanus. N. Home, Patrick. G Kilonzo, Fidelis. N. 2016-09-21T12:48:46Z 2016-09-21T12:48:46Z 2016-09-21
dc.description.abstract The adsorption of chromium (VI) ions from aqueous solution by charcoal from acacia (Acacia tortilis) tree were studied in a batch adsorption system. Various parameters such as the effect of initial chromium concentrations, pH, and contact time on Cr (VI) removal were investigated. The removal of Cr (VI) ions was observed to increase with contact time, and reduced with increasing initial chromium concentration. The optimum pH for chromium (VI) removal was attained between pH 5.0 and 6.0. Simulation kinetic models results showed that the pseudo-second–order kinetic model (R2>0.983) best describes the kinetic sorption of Cr (VI) ions onto the acacia charcoal. Moreover, the Langmuir and Freundlich models agreed very well with experimental data with a regression coefficient of 0.999 and 0.998, respectively. Desorption studies using nitric acid (HNO3) indicated high capability of chromium regeneration with desorption of higher than 92% being observed. Use of acacia tree charcoal for adsorption of Cr (VI) ions in this study exhibited high potentials for chromium ions removal from aqueous solution. These results suggest that acacia tree charcoal can be employed as an efficient adsorption for Cr (VI) removal in contaminated waters and can be utilized for recovery of chromium. Results from this study can be utilized in assessing the effectiveness of acacia tree charcoal for Chromium heavy metal at the field scale. en_US
dc.language.iso en en_US
dc.publisher JKUAT en_US
dc.relation.ispartofseries Journal of Sustainable Research in Engineering;Vol. 1 (3) 2014
dc.subject adsorption isotherms en_US
dc.subject Chromium (VI) en_US
dc.subject natural charcoal en_US
dc.title Adsorption of Chromium (VI) from Aqueous Solution by Acacia Tree (Acacia tortilis) Charcoal en_US
dc.type Article en_US

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