Removal and Recovery of Heavy Metals from Simulated Wastewater Using Insoluble Starch Xanthate Process
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 12, Issue 3
Abstract
The effectiveness of insoluble starch xanthate (ISX) for removal and recovery of heavy metals [ , , , and ] from simulated wastewater was evaluated. The metal–xanthate interaction is considered as sorption process involving two simultaneous reactions: (1) complexation of metal with xanthate groups; and (2) decomposition of xanthates. The kinetics and equilibrium studies indicate that the rate of metal uptake by ISX is quite rapid and the Freundlich constants indicate that the interaction is chemisorption. The metal uptake capacity of ISX remains almost the same in the pH range 5–7. The affinity, and also the selectivity of metals for xanthate, follow the reciprocal of metal–ethylxanthate solubility product. The aqueous phase conditions and ISX dosage can be controlled to selectively remove metals from the aqueous phase containing mixtures of metals [ , , , and ]. Also selective recovery of metals from ISX sludge containing the metals is feasible.
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 12 • Issue 3 • July 2008
Pages: 170 - 180
Copyright
© 2008 ASCE.
History
Received: May 1, 2007
Accepted: Sep 30, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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