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Paper Details

New Bio-Sorbents in the Removal of Chromium (VI) From Polluted Waters

O. Sree Devi and K. Ravindhranath*

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


Powders of leaves, stem/bark and their ashes of Datura metel, Cleome viscosa and Asparagus racemosus are found to have strong affinity towards Chromate at low pH values. The sorption characteristics of these bio-products in controlling the Chromium (VI) pollution in waste waters, are studied varying physicochemical parameters such as pH, sorption concentration and equilibration time. The conditions for maximum extraction of Chromium (VI) have been optimized. Ten fold excess of common cations present in natural waters viz., Ca2+, Mg2+, Cu2+, Zn2+ and Ni2+ have marginal affect on the % of extraction of Chromate while anions like SO4 2- and PO4 3- are found to be interfering to some extent but in no case, the extractability comes down below 80.0%. The applicability of procedures developed in this work are applied to diverse waste water samples collected in nine different places and the methodologies developed, have been found to be remarkably successful in removing the Chromate from industrial effluents and polluted lake samples.

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