Removal of Cr(VI) from Aqueous Solutions Using Powder of Potato Peelings as a Low Cost Sorbent
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Date
2014-06
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Publisher
Hindawi Publishing Corporation
Abstract
Potato peels which are a low cost, renewable agroindustry by-product were used for the removal of hexavalent chromium from
aqueous effluents. Batch experiments were carried out with an artificial effluent comprising of potassium dichromate in deionised
water. The effects of the initial hexavalent chromium concentration, dose of biosorbent, and removal kinetics were explored. An
adsorbent dosage of 4 g/L was effective in complete removal of the metal ion, at pH 2.5, in 48 minutes. The kinetic process of
Cr(VI) adsorption onto potato peel powder was tested by applying pseudo-first-order and pseudo-second-order models as well as
the Elovich kinetic equation to correlate the experimental data and to determine the kinetic parameters. The adsorption data were
correlated by the Langmuir and Freundlich isotherms. A maximum monolayer adsorption capacity of 3.28 mg/g was calculated
using the Langmuir adsorption isotherm, suggesting a functional group limited adsorption process. The results confirmed that
potato peels are an effective biosorbent for the removal of hexavalent chromium from effluent.
Description
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Keywords
Powder of Potato Peelings, Aqueous Solutions, hexavalent chromium, Removal of Cr(VI), Low Cost Sorbent
Citation
Mutongo, F., Kuipa O. & Kuipa P.K., 2014. Removal of Cr(VI) from Aqueous Solutions Using Powder of Potato Peelings as a Low Cost Sorbent. Bioinorganic Chemistry and Applications, pp.1-7.