US EPA

4453456 

Journal Article 

Extraction of Natural Surfactant Saponin from Soapnut (Sapindus mukorossi) and its Utilization in the Remediation of Hexavalent Chromium from Contaminated Water 

Mondal, MH; Malik, S; Garain, A; Mandal, S; Saha, B 

2017 

1 

Tenside Surfactants Detergents
ISSN: 0932-3414
EISSN: 2195-8564 

Carl Hanser Verlag 

MUNICH 

54 

6 

519-529 

English 

10.3139/113.110523 

WOS:000417343400007 

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. 

Saponin extraction; hexavalent chromium; remediation; sorption kinetics; thermodynamic parameters