TY - JOUR
T1 - New biodegradable organic-soluble chelating agents for simultaneous removal of heavy metals and organic pollutants from contaminated media
AU - Ullmann, Amos
AU - Brauner, Neima
AU - Vazana, Shlomi
AU - Katz, Zhanna
AU - Goikhman, Roman
AU - Seemann, Boaz
AU - Marom, Hanit
AU - Gozin, Michael
N1 - Funding Information:
This research was supported by the Israel Science Foundation, funded by the Israel Academy of Sciences and Humanities (grant no. 1226/07 ). The authors gratefully acknowledge Dr. Nick Dixon (Innospec Active Chemicals) for kindly providing the S,S-EDDS chelator (Octaquest A65), Prof. Eliora Ron (Tel-Aviv University) for conducting the toxicology experiments and Dr. Bogdan Belgorodsky for his contribution.
PY - 2013/9/15
Y1 - 2013/9/15
N2 - 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.
AB - 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.
KW - Biodegradable
KW - Chelating agents
KW - Extraction
KW - Heavy metals
KW - Partially miscible solvents
KW - Remediation
UR - http://www.scopus.com/inward/record.url?scp=84879996538&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2013.06.027
DO - 10.1016/j.jhazmat.2013.06.027
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AN - SCOPUS:84879996538
SN - 0304-3894
VL - 260
SP - 676
EP - 688
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -