New bio-sorbents in the control of chromium (VI) pollution in waste waters.
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Date
2012-04
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Abstract
The sorption abilities of leaves powders of Bhringraj , Aerva lanata, Trianthema
portulacastrum L for extracting Chromium (VI) from polluted waters have been studied with respect to
various physicochemical parameters such as pH, sorption dosage and equilibrium time. The conditions for
maximum removal of Chromium (VI) have been optimized. Ten fold excess of common cation ions present in
natural waters, viz., Ca2+, Mg2+ , Cu2+, Zn2+, Ni2+ and Fe2+ have synergistic effect in increasing the % removal
of Chromate. SO4
2—and Phosphates are found to be interfering with the extractability of Chromates but NO3
- ,
Chloride, Fluoride and Carbonate have marginal interference. However, the extraction has never come down
below 72.0%. Maximum extractions to an extent of 96.0%, 92.0%, and 84.0% from synthetic waters are
observed with the leaves powders of Bhringraj , Aerva lanata, Trianthema portulacastrum L respectively at
pH:2 and at optimum equilibration time and sorbent concentrations. The methodologies developed are applied
to diverse waste water samples collected from industrial effluents and polluted lakes. The procedures are
found to be remarkably successful in removing the Chromiume(VI) from waste waters.
Description
Keywords
Chromium (VI), pollution control, bio-sorbents, Bhringraj, Aerva lanata, Trianthema portulacastrum L.
Citation
Sekhar K P C, Babu R V Vishnu, Rohini T, Ravindhranath K. New bio-sorbents in the control of chromium (VI) pollution in waste waters. International Journal of Applied Biology and Pharmaceutical Technology. 2012 Apr-Jun; 3(2): 115-125.