Electrochemical extraction of heavy metal ions assisted by cyclic thioether ligands

Lagger, Grégoire; Tomaszewski, Laure; Osborne, Murray D.; Seddon, Brian; Girault, Hubert H.

doi:10.1016/s0022-0728(97)00389-6

Cited by 57 publications

(52 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33 For this reason, they are commonly used to extract heavy metals, for instance. 5,15,23 The complexation process depends on several parameters, but one of the most important is the size of the ring. HTCO is a thioether crown and has been widely employed.…”

Section: Lead Extraction By Thioether Crownsmentioning

confidence: 99%

“…One case that probes this role is 1,4,7,10-tetrathiacyclododecane, another thioether crown that is known to form a 2:1 complex with lead. 15 Thus, TTCD was chosen as a model system to analyze the 2:1 complex formation at the liquid-liquid interface created in ESI. The reaction was first performed with 100 mM of PbCl2 in water and 200 mM of TTCD in DCE.…”

Section: Lead Extraction By Thioether Crownsmentioning

confidence: 99%

“…14 Assisted ion transfer reactions are an important class of charge transfer reactions where ligands or ionophores in the organic phase can interfacially complex aqueous ions to extract them to the organic phase. 5,6,15,16 The electrochemical methodology can be used to determine the stoichiometry of the organic complexes, as well as their lipophilicity. [17][18][19] To gain more information on the interfacial reaction mechanisms, different spectroscopic techniques such as voltabsorptometry or voltfluorimetry have been developed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biphasic Electrospray Ionization for the Study of Interfacial Complexes

Prudent

Méndez

2008

ANAL. SCI.

Self Cite

View full text Add to dashboard Cite

Biphasic electrospray ionization (BESI) mass spectrometry is achieved by using a dual-channel microsprayer, where channels filled with different immiscible phases meet at the Taylor cone. Two types of interfacial complexation reactions have been studied: the interfacial complexation of aqueous lead ions by thioether crown molecules, and the interfacial complexation of an aqueous dipeptide by dibenzo-18-crown-6 as ionophore. The mass spectra also give valuable information on the stoichiometry of the complexation reaction.

show abstract

Section: Lead Extraction By Thioether Crownsmentioning

confidence: 99%

Section: Lead Extraction By Thioether Crownsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biphasic Electrospray Ionization for the Study of Interfacial Complexes

Prudent

Méndez

2008

ANAL. SCI.

Self Cite

View full text Add to dashboard Cite

show abstract

“…21 Recently, Girault and co-workers have studied the transfer of Pb 2+ and Cd 2+ ions assisted by cyclic tetrathio ethers across DCE/W interface. 22 In this paper, we report on the voltammetric behavior of HTCO-assisted transfer of Cd 2+ , Pb 2+ , Hg 2+ , Pd 2+ , and Cu 2+ ions across NB/W interface in some detail. The formal potentials of simple or non-assisted transfer of heavy metal ions, including Pb 2+ , Cd 2+ , Zn 2+ , and Tl + ions, at NB/W interface have also been elucidated.…”

mentioning

confidence: 99%

Voltammetric Study of the Transfer of Heavy Metal Ions at Nitrobenzene/Water Interface Assisted by 1,4,7,10,13,16-Hexathiacyclooctadecane

Katano

Senda

1999

ANAL. SCI.

View full text Add to dashboard Cite

Recently, voltammetric study of the transfer of heavy metal ions across organic solvent/water (O/W) interface assisted by ionophores or organic extractants has been the subjects of research interest by several authors. Such ionophores as 1,10-phenanthrolines 1,2,9-11,15 , 2,2′-bipyridine 2-4 , dithizone 5 , ethylenediamines 6 , 2,2′,2″-terpryridine 7,15 , polyethylene glycols 8 , quinolin-8-ol 12 , N,N′-bis-[2-(diphenylphosphino)phenyl]propane-1,3-diamine 13 , methylenebis (diphenylphosphineoxide) 14 , 5,6-diphenyl-3-(2-pyridyl)-1,2,4-triazine 15 , and 6,7-dimethyl-2,3-di(2-pyridyl)quinoxaline 16 , have been studied. We have studied the transfer of heavy metal ions, such as Cd 2+ , Pb 2+ , Hg 2+ , Pd 2+ , and Cu 2+ ions, across nitrobenzene(NB)/W and 1,2-dichloroethane(DCE)/W interface assisted by macrocyclic polythiaether, 1,4,7,10,13,16-hexathiacyclooctadecane (HTCO) present in the O-phase. The voltammetric wave of HTCOassisted transfer of Pb 2+ ion at NB/W interface has been shown to be a reversible process facilitated by the formation of a 1:1 Pb 2+ -HTCO complex in NB-phase. 17 It has been shown that ion-transfer voltammetry of the HTCO-assisted ion-transfer can be applied to the study of the equilibrium and dynamic properties of metal ion complexes in W-phase. 18-20 Also, it has been shown that ion-transfer stripping voltammetry, in which the HTCO-assisted anodic preconcentration of the ions into a thin organic gel layer followed by cathodic dissolution back to W-phase, can be applied to the trace determination of heavy metal ions at ppb level. 21 Recently, Girault and co-workers have studied the transfer of Pb ExperimentalChemicals HTCO was obtained from Aldrich and used as received. n-Tetrapentylammonium tetrakis(4-chlorophenyl)borate (TPnATClPB) was prepared as previously described. 17 n-Tetrapentylammonium chloride (TPnACl) and NB were obtained from Wako and purified as previously mentioned.17 n-Tetrabutylammonium tetraphenylborate (TBATPB) was prepared according to the reported method.23 n-Tetrabutylammonium chloride (TBACl) was obtained from Wako and purified according to the reported method. 23 Other chemicals were of analytical grade and used as received. Ion-transfer voltammetric measurementsThe transfer of heavy metal ions assisted by HTCO across NB/W interface was studied by means of cyclic voltammetry. The electrochemical system used for the voltammetric measurements is represented by cell (I): 1179ANALYTICAL SCIENCES DECEMBER 1999, VOL. 15 1999

show abstract

“…8 shows how the potassium ion transfer facilitated by studied not only from an analytical point of view but also for electrorefining applications. Some examples of selective extraction of metal:ligand systems at large interfaces include Pb(II) and Cu(II):1,4,7,10-tetra-thiacyclododecane (TTCD) [100,101], Cu(II):N,N%-bis[2-(diphenylphosphino)-phenyl]propane-1,3-diamine [102] Cu(II):6,7-dimethyl-2,3-di(2-pyridyl)quinoxaline [103], Cd(II):1,4,7-trithiacyclononane [104], Cd(II):bipyridine [105], Ni(II):1,10 phenanthroline [106] and Cu(II), Cd(II) and Ni(II):2,2%;6%2%%-terpyrindine [107]. Based on the methodology of assisted ion transfer reactions and UV excimer photoablation techniques, we have recently developed a new type of supported liquid membranes comprising two micro-machined thin polymer films featuring an array of micro-interfaces [108].…”

Section: Electro-assisted Sol6ent Extractionmentioning

confidence: 99%