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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 2, 2014, pp. 449-460
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Bioline Code: st14045
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 2, 2014, pp. 449-460
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Commercial steel wool for reduction of hexavalent chromium in wastewater: batch kinetic studies and rate model
Mitra, P.; Banerjee, P.; Sarkar, D. & Chakrabarti, S.
Abstract
The present study aims at searching the
potential of commercial grade steel wool in reducing
hexavalent chromium in aqueous phase under batch mode.
About 30 % of the initial hexavalent chromium was found
to reduce within 2 h at a pH of 3. However, on testing the
combined effects of different process parameters, namely
the solution pH, wool loading, etc., the optimum batch
parametric condition has been fixed. A moving boundary
type kinetic model, which takes into account the effect of
passivation along with the direct reduction mechanism to
simulate the gross uptake profile of Cr(VI) from the bulk
solution is proposed. The effective pore diffusivity of
Cr(VI) in commercial steel wool was determined by a
suitable global optimization technique. Additionally, the
model is also capable to simulate the decline of active
external surface area of the wool caused by passivation
with time. A good match of the experimental data and
model-simulated transient bulk concentration of Cr(VI)
(under optimum parametric condition only) establishes the
general validity of the proposed model.
Keywords
Batch study; Heavy metal; Kinetic model; Passivation; Zero-valent iron
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