Complexons as reagents for demetallization of contaminated sediments

Complexons as reagents for demetallization of contaminated sediments Effect of various complexons [ethylenediaminetetraacetic acid, nitrilotriacetic acid, iminodiacetic acid, ethylenediaminetetra(methylenephosphonic acid), nitrilotris(methylenephosphonic acid)] on the sorption of heavy metal cations Cu2+, Ni2+, Pb2+, Zn2+ by crystalline and amorphous Fe(III), Al(III), and Mn(IV) oxides and hydroxides was studied. The sorption processes in systems constituted by a metal cation, complexon, and sediment were analyzed in terms of the theory of surface complexation. The factors affecting the processes of remobilization/immobilization of heavy metals under the action of complexons were studied. The desorbing effect of complexons becomes stronger with increasing stability and decreasing sorption capacity of complexonates formed in solution. A flow chart of recovery of heavy metals from contaminated sediments with ethylenediaminetetraacetic acid was developed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Complexons as reagents for demetallization of contaminated sediments

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Publisher
Pleiades Publishing
Copyright
Copyright © 2014 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S107042721410005X
Publisher site
See Article on Publisher Site

Abstract

Effect of various complexons [ethylenediaminetetraacetic acid, nitrilotriacetic acid, iminodiacetic acid, ethylenediaminetetra(methylenephosphonic acid), nitrilotris(methylenephosphonic acid)] on the sorption of heavy metal cations Cu2+, Ni2+, Pb2+, Zn2+ by crystalline and amorphous Fe(III), Al(III), and Mn(IV) oxides and hydroxides was studied. The sorption processes in systems constituted by a metal cation, complexon, and sediment were analyzed in terms of the theory of surface complexation. The factors affecting the processes of remobilization/immobilization of heavy metals under the action of complexons were studied. The desorbing effect of complexons becomes stronger with increasing stability and decreasing sorption capacity of complexonates formed in solution. A flow chart of recovery of heavy metals from contaminated sediments with ethylenediaminetetraacetic acid was developed.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Jan 23, 2015

References

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