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Biosorption of aqueous chromium(VI) by tamarindus indica seeds

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Title Biosorption of aqueous chromium(VI) by tamarindus indica seeds
 
Creator AGARWAL, GS
BHUPTAWAT, HITENDRA KUMAR
CHAUDHARI, SANJEEV
 
Subject adsorption
biosorption
chromium
tamarind seed
desorption
 
Description The effectiveness of low cost agro-based materials namely, Tamarindus indica seed (TS), crushed coconut shell (CS), almond shell (AS), ground nut shell (GS) and walnut shell (WS) were evaluated for Cr(VI) removal. Batch test indicated that hexavalent chromium sorption capacity (qe) followed the sequence qe(TS) > qe(WS) > qe(AS) > qe(GS) > qe(CS). Due to high sorptive capacity, tamarind seed was selected for detailed sorption studies. Sorption kinetic data followed first order reversible kinetic fit model for all the sorbents. The equilibrium conditions were achieved within 150 min under the mixing conditions employed. Sorption equilibria exhibited better fit to Freundlich isotherms (R > 0.92) than Langmuir isotherm (R ≈ 0.87). Hexavalent chromium sorption by TS decreased with increase in pH, and slightly reduced with increase in ionic strength. Cr(VI) removal by TS seems to be mainly by chemisorption. Desorption of Cr(VI) from Cr(VI) laden TS was quite less by distilled water and HCl. Whereas with NaOH, maximum desorption achieved was about 15.3%. When TS was used in downflow column mode, Cr(VI) removal was quite good but head loss increased as the run progressed and was stopped after 200 h.
 
Publisher Elsevier
 
Date 2009-06-22T07:23:51Z
2011-12-08T08:05:12Z
2011-12-26T13:02:35Z
2011-12-27T05:49:07Z
2009-06-22T07:23:51Z
2011-12-08T08:05:12Z
2011-12-26T13:02:35Z
2011-12-27T05:49:07Z
2006
 
Type Article
 
Identifier Bioresource Technology 97(7), 949-956
0960-8524
10.1016/j.biortech.2005.04.030
http://hdl.handle.net/10054/1568
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1568
 
Language en