Journal
TENSIDE SURFACTANTS DETERGENTS
Volume 54, Issue 6, Pages 519-529Publisher
CARL HANSER VERLAG
DOI: 10.3139/113.110523
Keywords
Saponin extraction; hexavalent chromium; remediation; sorption kinetics; thermodynamic parameters
Funding
- CSIR-UGC
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In this study optimization of extraction conditions for saponin from soapnut (Sapindus mukorossi) has been investigated. This investigation showed that a better extraction of saponin can be achieved with increasing the dielectric constant of solvent employed. The best yield was attained in a 50% v/v aqueous ethanol medium. Another objective of the present study is to assess the thermodynamics of the uptake-reduction of hexavalent chromium in contaminated water samples using saponin. Pyrene has been employed to determine the critical micellar concentration (CMC) (in the UV-vis method of determination) of saponin as a spectroscopic probe. Thus, the effectiveness of the bio-surfactant as a self-motivated adsorbent for hexavalent chromium is investigated. Several physico-chemical parameters like contact time, sorbate concentration, pH and temperature have been determined. The findings of the investigation invoked a very efficient uptake of 213.48 mg g(-1) of hexavalent chromium from the contaminated water sample at a lower value of pH 2 and temperature 35 degrees C. It is observed that the method followed a pseudo-first order kinetics, where the evaluated Delta G(0) has supported the sorption as a feasible and spontaneous process. The HR-MS, FTIR, steady state Fluorescence spectroscopy, HR-TEM and UV-Vis spectroscopy have been employed for the current scientific studies.
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