The extractability of Chromium (VI) from waste waters using surface sorption abilities of powders of barks and their ashes of Ficus benghalensis , Tamarindus indica and Acasia nilotica Indica has been investigated. These plant materials have been found to have strong affinity towards Chromium (VI) at low pH values. The physicochemical parameters such as pH, sorbent concentration and time of equilibration have been optimized for obtaining the maximum % of removal of Chromium (VI) from polluted waters. Bark powders of Ficus benghalensis , Tamarindus indica and Acasia nilotica Indica have been found to remove 90.4% ,92.5%, and 95.2% of Chromate from synthetic waters while % of removal is found to be 99.8%, 99.2%, and 98.0% with their ashes respectively at pH 2 and at optimum conditions of equilibration time and sorbent concentrations. Sorbent dosage and time needed for the maximum removal of Chromium(VI) are less for the ashes of barks than with the raw bark powders. The presence of tenfold excesses of Cations viz., Ca2+, Mg2+ , Cu2+, Zn2+ and Ni2+ and anions like NO3- ,Chloride, Fluoride and Carbonate have marginally effected the % removal of Chromium (VI) while Sulphate and Phosphate have showed some interference in one or two sorbents but even with them, the % of extractability never comes down to 74.6%. The adoptability of the methodologies developed in this work are tested with respect to real diverse waste water samples collected from industrial effluents and in natural lakes and found to be remarkably successful.
Cite this article:
V. Krishna Veni, K. Ravindhranath. Extraction of Chromium (VI) from Waste Waters Using Powders and Their Ashes of Barks of Ficus benghalensis, Tamarindus indica and Acasia nilotica Indica. Asian J. Research Chem. 5(2): February 2012; Page 225-233.