New biodegradable organic-soluble chelating agents for simultaneous removal of heavy metals and organic pollutants from contaminated media

Amos Ullmann*, Neima Brauner, Shlomi Vazana, Zhanna Katz, Roman Goikhman, Boaz Seemann, Hanit Marom, Michael Gozin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Advanced biodegradable and non-toxic organic chelators, which are soluble in organic media, were synthesized on the basis of the S,S-ethylenediamine-disuccinate (S,S-EDDS) ligand. The modifications suggested in this work include attachment of a lipophilic hydrocarbon chain ("tail") to one or both nitrogen atoms of the S,S-EDDS.The new ligands were designed and evaluated for application in the Sediments Remediation Phase Transition Extraction (SR-PTE) process. This novel process is being developed for the simultaneous removal of both heavy metals and organic pollutants from contaminated soils, sediments or sludge. The new chelators were designed to bind various target metal ions, to promote extraction of these ions into organic solvents. Several variations of attached tails were synthesized and tested. The results for one of them, N,. N'-bis-dodecyl-S,S-EDDS (C24-EDDS), showed that the metal-ligand complexes are concentrated in the organic-rich phase in the Phase Transition Extraction process (more than 80%).Preliminary applications of the SR-PTE process with the C24-EDDS ligand were conducted also on actually contaminated sludge (field samples). The extraction of five toxic metals, namely, Cd, Cu, Ni, Pb and Zn was examined. In general, the extraction performance of the new ligand was not less than that of S,S-EDDS when a sufficient ligand-to-extracted ion ratio (about 4:1 was applied.

Original languageEnglish
Pages (from-to)676-688
Number of pages13
JournalJournal of Hazardous Materials
Volume260
DOIs
StatePublished - 15 Sep 2013

Funding

FundersFunder number
Israel Academy of Sciences and Humanities1226/07
Israel Science Foundation

    Keywords

    • Biodegradable
    • Chelating agents
    • Extraction
    • Heavy metals
    • Partially miscible solvents
    • Remediation

    Fingerprint

    Dive into the research topics of 'New biodegradable organic-soluble chelating agents for simultaneous removal of heavy metals and organic pollutants from contaminated media'. Together they form a unique fingerprint.

    Cite this