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Adsorption studies on the removal of hexavalent chromium from aqueous solution using a low cost fertilizer industry waste material

K. Gupta, Vinod and Rastogi, Arshi and Nayak, Arunima (2009) Adsorption studies on the removal of hexavalent chromium from aqueous solution using a low cost fertilizer industry waste material. Journal of Colloid and Interface Science.

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Abstract

Low cost fertilizer industry waste material called carbon slurry, produced in generators of fuel oil based industrial generators was converted into an effective and efficient adsorbent for the removal of hexavalent chromium (VI) from aqueous solutions.The waste was chemically treated, activated, characterized and used for the adsorption of chromium. The work involves batch experiments to investigate the effect of contact time, pH, temperature, concentration and adsorbent dose on the extent of adsorption by carbon slurry. The maximum adsorption was found at 70 min., 2.0 pH, 4.0 g/L dose, 303 K temperature. Maximum adsorption capacity (15.24 mg/g) of Cr(VI) on carbon slurry was observed at 100 mg/L initial Cr(VI ) concentration. Langmuir and Freundlich adsorption isotherm models were applied to analyze adsorption data, and both were found to be applicable to this adsorption system, in terms of relatively high regression values. Thermodynamic parameters showed that the adsorption of Cr(VI) onto carbon slurry was feasible, spontaneous and exothermic under studied conditions. Kinetics of adsorption was found to follow pseudo second order rate equation. Column studies have been carried out to compare these with the batch capacities. The recovery of Cr(VI) and chemical regeneration of the spent column have also been tried. In all, the results indicated that the adsorbent used in this work proved to be effective material for the treatment of chromium bearing aqueous solutions.



Item Type:Article
Date:30 September 2009
Date Type:Publication
Subjects:Chemistry
Divisions:College Of Sciences > Chemistry Dept
Creators:K. Gupta, Vinod and Rastogi, Arshi and Nayak, Arunima
Email:vinodfcy@gmail.com, UNSPECIFIED, UNSPECIFIED
ID Code:136168
Deposited By:Morshed Alam Bhuiyan
Deposited On:18 Oct 2009 17:15
Last Modified:12 Apr 2011 13:16

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