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1

Selective transport of copper(II) ions across polymer inclusion membrane with aromatic β–diketones as carriers

Radzymińska-Lenarcik E., Witt K., Bożejewicz D.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

741--750

EN

The transport of Cu(II) ions from an equimolar mixture of Co(II), Ni(II), and Cu(II) ions as well as from solutions containing only Cu(II) ions in the feed phase through polymer inclusion membranes (PIMs) with aromatic β–diketones as carriers has been investigated. The polymer membranes consisted of polyvinylchloride (PVC) as the support, bis(2-ethylhexyl)adipate (ADO) as plasticizer, and aromatic β–diketones (benzoylacetone (1) and dibenzoylmethane (2)) as ion carriers. The transport selectivity of PIMs with 1 and 2 was: Cu(II) > Co(II) > Ni(II). The highest recovery factors of Cu(II) ions were observed for 1 (94.0%), whereas for Co(II) and Ni(II) the factors were 21.4 and 7.3%, respectively. The Cu(II)/Co(II) and Cu(II)/Ni(II) selectivity coefficients were equal to 8.9 and 33.7 (for 1), 6.4 and 28.3 (for 2), respectively.

2

Synergistic solvent extraction of Co(II) and Li(I) from aqueous chloride solutions with mixture of Cyanex 272 and TBP

Pospiech B.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 1

353--364

EN

In this work, separation of cobalt(II) over lithium(I) ions from aqueous chloride solutions by synergistic solvent extraction (SX) has been studied. A synergistic mixture of commercial extractants such as bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) and tributyl phosphate (TBP) in kerosene was used as a selective extractant. The investigations were first performed to select optimal conditions for the effective separation including pH of the aqueous phase as well as concentration of synergistic mixture. High selective solvent extraction of cobalt(II) over lithium(I) from chloride solution has been achieved by the mixture of 0.1 M Cyanex 272 and 0.05 M TBP in kerosene while efficient Co(II) stripping has been performed by 0.5 M sulphuric acid.

3

Separation of palladium(II) from mixtures of non-ferrous metal ions by solvent extraction

Radzyminska-Lenarcik E., Witt K.

Challenges of Modern Technology

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2016

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Vol. 7, no. 1

17-22

EN

The possibility of Pd(II) ions separation from mixtures of Co(II), Ni(II), Cu(II) and Pd(II) ions by solvent extraction was studied, using 1-hexyl-2methylimidazole in chloroform as the extractant. The initial concentration of each ion was 10 mM. The tests were carried out at a temperature of 25°C, at a constant strength of the aqueous solution of I = 0.5, as maintained by the KCl solution. It was demonstrated that differences in the stability and structure of their coordination sphere as well as solubility of complexes with the extractant could be used for separating the Co(II), Ni(II), Cu(II) and Pd(II) ions by solvent extraction. Pd(II), which forms flat-square complexes in the solutions, passes easily into the organic phase and is easier separated from the mixture of Co(II), Ni(II), Cu(II) ions, which form octahedral or tetrahedral complexes. Extraction percentages were calculated. For the respective metals, their values increase for increasing concentrations of the extractant in the aqueous phase. The extraction percentage decreases in the following order: Pd(II) > Cu(II) > Co(II) > Ni(II). In the case of the quaternary mixture, the highest extraction percentage for Pd(II) (70%) was obtained at a pH=7.33. Separation coefficients were also calculated. The highest separation coefficients were obtained for the system: Pd(II)/Ni(II), Pd(II)/Co(II); at a pH of 5.4 for an aqueous solution, their values are 13.3 and 7.7, respectively.

4

Wydzielanie cynku(II) z roztworów odpadowych powstających w przemyśle metalurgicznym

Gajda B., Skrzypczak A., Bogacki M. B.

Rudy i Metale Nieżelazne Recykling

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2015

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R. 60, nr 1

23--29

PL

Celem pracy było zbadanie możliwości selektywnego wydzielenia jonów cynku(II) z polimetalicznych odpadowych roztworów chlorkowych zawierających kationy takich metali, jak: niklu(II), kobaltu(II), kadmu(II) z zastosowaniem polimerowych membran inkluzyjnych. Jako przenośnik jonów w membranie zaproponowany został 1-decyloimidazol. Uzyskane wyniki pozwoliły zauważyć znaczący wpływ stężenia anionów chlorkowych na proces separacji jonów metali. Stwierdzono również, że jony cynku(II) najefektywniej wydzielić można z roztworu o stężeniu 1M anionów chlorkowych. Z roztworu takiego odzyskuje się ok. 88-90 % Zn(II). Zdolność do wydzielenia pozostałych jonów kształtuje się w szeregu: Cd(II) ≥ Co(II) > Ni(II).

EN

The aim of the work was investigation of possibility of selective releasing of zinc(II) ions from polymetalic discarded chloride solutions containing metal cations like: nickel(II), cobalt(II) and cadmium(II) by applying polymer inclusion membranes. As a carrier of metal ions in membrane, the 1-decylimidazole was used. Based on obtained results, significant influence of chloride anions on separation process was observed. It was found that zinc(II) ions were transported fastest from solution containing 1M of chloride anions. In this case, it was possible to release about 88-90 % of Zn(II). The membrane ability to releasing rest of ions change in series: Cd(II) ≥ Co(II) > Ni(II).

5

The use of the steric effect of the carrier molecule in the polymer inclusion membranes for the separation of cobalt(II), nickel(II), copper(II), and zinc(II) ions

Radzyminska-Lenarcik E., Ulewicz M.

Polish Journal of Chemical Technology

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2015

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Vol. 17, nr 2

51--56

EN

In this study, palladium-modified nickel foam substrate was applied to examine ethanol oxidation reaction (EOR) in 0.1 The transport of cobalt(II), nickel(II), copper(II), and zinc(II) ions from chloride solutions across polymer inclusion membranes (PIMs), which 1-heptylimidazole (1̲) or 1-heptyl-2-methylimidazole (2̲) or 1-heptyl-4-methylimidazole (3̲) as the ion carrier was reported. The steric effect for carriers 2̲&enspand 3̲&enspdecreases the transport of all ions except Cu(II). The initial fluxes of metal ions transport across PIMs with the 1̲- 2̲&enspdecrease in the sequence: Cu(II) > Zn(II) > Co(II) > Ni(II), whereas for 3 they were Cu(II) > Zn(II) > Ni(II) > Co(II). The highest recovery values were obtained for Cu(II), this being 99 and 85% for carrier 1̲&enspand 2̲, respectively. In both membranes the degree of deposition of the Zn(II) ions was comparable. Zn(II), Co(II) and Cd(II) ions, which form complexes with coordination numbers 4 and 6, are more easily recovered with the use of carriers 2̲&enspand 3̲. Ni(II) ions, which form complexes with coordination number 6 only, practically remain in the feeding phase. PIMs with alkylimidazoles were characterized by non-contact atomic force microscopy.

6

Nickel-cobalt separation by solvent extraction method

Radzyminska-Lenarcik E., Wasilewska A.

Challenges of Modern Technology

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2015

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Vol. 6, no. 3

20--23

EN

Separation of cobalt(II), and nickel(II) ions from nitrate solutions using liquid-liqiud extraction process was reported. The measurements were run at 25oC and at fixed ionic strength equal to 0.5 (KNO3,HNO3). Initial concentrations of Co(II) and Ni(II) nitric acid in the aqueous phase were constant (0.01 M and 0.15 M, respectively). Both 1-hexylimidazole (1), and 1-hexyl-2-methylimidazole (2), both in dichloromethane were used as extractants. Their concentrations in organic phase were varied from 0.01 to 0.25 M. Cobalt(II) in an aqueous solution forms both tetrahedral and octahedral complexes. Nickel(II) forms only a six-coordinate complexes. These general differences help to provide the basis for the various separation processes currently used for cobalt-nickel separation. The steric effect for extractant 2 facilitates the extraction of tetrahedral Co(II) complexes. Extraction percent (%E) of cobalt(II) and nickel(II) in the systems studied were calculated. The percentage extraction increases for increasing values of pH of aqueous phase and is the highest for pH = 7.2. In the aqueous phase, of which the pH = 7.2, there remain 75%Ni(II) and 40% Co(II) for extractant 1 and the respective values for extractant 2 are 85% Ni(II) and 20% Co(II). The steric effect increases selectivity coefficients Co(II)/Ni(II). The highest selectivity coefficients for both extractants were obtained at a pH of aqueous phase = 6.2; their values were 5 and 8.9 for extractants 1 and 2, respectively.

7

Separation Of Cadmium(II), Cobalt(II) And Nickel(II) By Transport Through Polymer Inclusion Membranes With Phosphonium Ionic Liquid As Ion Carrier

Pospiech B.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 4

2933--2938

EN

This paper presents study on the facilitated transport of cadmium(II), cobalt(II) and nickel(II) ions from aqueous chloride solutions through polymer inclusion membranes (PIMs) with phosphonium ionic liquid. Cyphos IL 101 (trihexyl(tetradecyl) phosphonium chloride) was used as a selective carrier for synthesis of cellulose triacetate membranes containing o-nitrophenyl pentyl ether (ONPPE) as a plasticizer. Effect of different parameters such as hydrochloric acid concentration in the source phase as well as ion carrier concentration in the polymer membrane on metal ions transport has been investigated. Cd(II) was transported preferably from hydrochloric acid solutions containing Co(II) and Ni(II) through PIM containing 18.8 wt.% CTA and 26.0 wt.% Cyphos 101 and 55.1 wt.% ONPPE into 0.5 M HNO3 as the receiving phase. The obtained results suggest that there is a possibility of application of this membrane with Cyphos IL 101 as ion carrier for separation of Cd(II) over Co(II) and Ni(II) from hydrochloric acid solutions.

PL

Przeprowadzono badania transportu jonów Cd(II), Ni(II) i Co(II) z wodnych roztworów kwasu solnego przez polimerowe membrany inkluzyjne (PIMs) zawierające fosfoniową ciecz jonową – Cyphos IL 101 (chlorek triheksylo(tetradecylo) fosfoniowy) w roli selektywnego przenośnika jonowego. Rolę polimerowej matrycy w membranie pełnił trioctan celulozy (CTA). Jako plastyfikatora użyto eteru nitrofenylopentylowego (ONPPE). W wyniku badań określono wpływ różnych czynników, takich jak stężenie kwasu solnego w fazie zasilającej, jak również stężenie przenośnika w polimerowej membranie na selektywność i efektywność transportu badanych jonów metali. Jony kadmu(II) były selektywnie transportowane z roztworów kwasu solnego zawierającego jony niklu(II) i kobaltu(II) do 0,5 M roztworu kwasu azotowego(V). Uzyskane wyniki wskazują, że istnieje możliwość zastosowania procesów transportu przez polimerowe membrany inkluzyjne z cieczą jonową w roli selektywnego przenośnika do rozdzielania jonów Cd(II) od Ni(II) i Co(II) z roztworów kwasu solnego.

8

Selective recovery of cobalt(II) towards lithium(I) from chloride media by transport across polymer inclusion membrane with triisooctylamine

Pospiech B.

Polish Journal of Chemical Technology

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2014

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Vol. 16, nr 1

15-20

EN

In this work the selective transport of cobalt(II) and lithium(I) ions from aqueous chloride solutions through polymer inclusion membranes (PIMs) is presented. Triisooctylamine (TIOA) has been applied as the ion carrier in membrane. The effects of various parameters on the transport of Co(II) and Li(I) were studied. The obtained results show that Co(II) ions were effectively removed from source phase through PIM containing 32 wt.% TIOA, 22 wt.% CTA (cellulose triacetate) and 46 wt.% ONPOE (o-nitrophenyl octyl ether) or ONPPE (o-nitrophenyl pentyl ether) into deionized water as the receiving phase. The results indicate that there is a possibility of polymer inclusion membranes application to recover Co(II) and Li(I) from aqueous chloride solutions.

9

The use of 1-alkylimidzoles for selective separation of zinc ions in the transport process across a polymeric inclusion membrane

Radzyminska-Lenarcik E., Ulewicz M.

Physicochemical Problems of Mineral Processing

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2014

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Vol. 50, iss. 1

131--142

EN

The transport of Zn(II) ions from different aqueous nitrate(V) source feeding phases (cMe = 0.001 mol/dm3, pH 6.0) across polymer inclusion membranes (PIMs) doped with 1-alkylimidazole as an ion carrier was reported. Alkyl substituents in position 1 of imidazole ring have an effect on hydrophobic properties of the carriers and the initial flux of the transported metal ions. The membranes were characterized by an atomic force microscopy (AFM). The results show that the Zn(II) ions could effectively be separated from other transition metal cations such as Co(II) and Ni(II) from different equimolar ion mixtures. Also, the thermal stability of PIM doped with 1-decylimidazole was studied in replicate experiments. The highest separation coefficients for the Zn(II)/Co(II) and Zn(II)/Ni(II) systems, equal to 9.4 and 11.9 were recorded for the equimolar Zn(II)-Co(II)-Ni(II) mixture for 1-hexylimidazole as a carrier, while using 1-decylimidazole resulted in the highest values of initial flux of the Zn(II) ions transport across the polymeric membrane.

10

Hydrometallurgical recovery of cobalt(ii) from acidic chloride solutions by transport through polymer inclusion membranes

Pospiech B.

Physicochemical Problems of Mineral Processing

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2013

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Vol. 49, iss. 2

641--649

EN

In this work a selective transport of Co(II) and Li(I) ions from acidic chloride solutions through polymer inclusion membranes (PIMs) with Cyanex 301 has been studied. The effect of composition of the polymer membrane has been investigated. The obtained results show that around 98% of Co(II) was transported from the source phase containing 0.01 M Co(II) and 0.01 M Li(I) at pH 4.0 through PIM after 12 h into 3.0 M HCl. The membrane containing 18 wt.% cellulose triacetate (CTA), 32 wt.% Cyanex 301 and 50 wt.% o-nitrophenyl octyl ether (ONPOE) showed very good stability, suggesting that there is a possibility of application of the membrane for Co(II) recovery from acidic leach liquor solutions of spent lithium ion batteries (LIBs).

11

Application of supported and polymer membrane with 1 decyl-2-methylimidazole for separation of transition metal ions

Ulewicz M., Radzyminska-Lenarcik E.

Physicochemical Problems of Mineral Processing

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2012

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Vol. 48, iss. 1

91-102

EN

The facilitated transport of Cu(II), Zn(II), Co(II), and Ni(II) ions from different aqueous nitrate source phases (cMe = 0.001M, pH 6.0) across polymer inclusion membranes (PIMs) consisting of cellulose triacetate (support) and 2-nitrophenylpentyl ether (plasticizer) doped with 1-decyl-2-methylimidazol as ion carrier was reported. The membrane is characterised by atomic force microscopy (AFM) and thermal analysis (DTA and TG) techniques. The results show that Cu2+ can be separated very effectively from other transition metal cations as Zn2+, Co2+, and Ni2+ from different equimolar mixtures of these ions. The recovery factor of Cu2+ ions during transport across PIM from different mixture is equal to 92-95.1%. The comparative transport of Cu(II), Zn(II), Co(II), and Ni(II) ions from aqueous nitrate source phase across supported (SLMs) containing 1-decyl-2-methylimidazol as ion carrier was reported.

12

Transport of metal ions across polymer inclusion membrane with 1-alkylimidazole

Ulewicz M., Radzymińska-Lenarcik E.

Physicochemical Problems of Mineral Processing

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2011

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Vol. 46

119-130

EN

The facilitated transport of copper(II), zinc(II), cobalt(II), and nickel(II) ions across polymer inclusion membranes (PIMs), which consist of cellulose triacetate as polymeric support, o-nitrophenyl pentyl ether as plasticizer and 1-alkylimidazole as ion carrier was reported. PIM was characterized by using atomic force microscopy (AFM) technique. The results show that Cu2+ can be separated very effectively from others heavy and transition metal cations as Zn2+, Co2+, and Ni2+ (at concentration of 10-3 M each). Alkyl substituents in position 1 of imidazole ring have an effect on hydrophobic properties and the initial flux of the transported metal ions. Also, the influence of the chloride ions concentration on the separation process was investigated. To explain the mechanism of membrane transport the diffusion of metal ions complexes with 1-alkylimidazole was also measured.

PL

Zbadano selektywność transportu jonów Cu(II), Zn(II), Co(II) i Ni(II) (cMe=0,001M, każdy) przez polimerowe membrany inkluzyjne składające się z trójoctanu celulozy (suportu), eteru o-nitrofenylooktylu (plastyfikatora) i przenośnika jonów (1 alkiloimidazole). Polimerowa membrana została scharakteryzowana przy pomocy mikroskopii sił atomowych (AFM). Wykazano, że podstawnik alkilowy w pozycji 1 pierścienia imidazolu zmieniając własności hydrofobowe przenośnika wpływa na strumień początkowy transportu jonów metali. Wartości strumienia początkowego transportu jonów przy użyciu przenośnika 1 i 2 maleją w szeregu: Cu(II) > Zn(II) > Co(II) > Ni(II), natomiast dla 3 - 5 w szeregu: Cu(II) > Zn(II) > Ni(II), Co(II). Strumień transportu Cu(II) wzrasta w szeregu użytych przenośników: 1 < 2 < 3 < 4 ɝ, osiągając najwyższą wartość 6,36 µµmol/m2 · s (dla 5). Na selektywność transportu wpływ również stężenie jonów chlorkowych w fazie zasilającej. Czynnikiem limitującym szybkości transportu Cu2+ przez PIM jest współczynnik dyfuzji kompleksu przenoszonego kationu przez membranę.

13

Separation of cobalt(II), nickel(II), zinc(II) and cadmium(II) ions from chloride solution

Gajda B., Skrzypczak A., Bogacki M. B.

Physicochemical Problems of Mineral Processing

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2011

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Vol. 46

289-294

EN

Selective distribution of cobalt(II), nickel(II), zinc(II) and cadmium(II) ions from chloride solutions through polymer inclusion membranes (PIM) has been studied. The carrier was 1-decylimidazole. The effect of chloride ion concentration on the ion permeation was analysed. The results suggest that some of metal ions change for the worse selectivity of separation process. Especially zinc(II) and cadmium(II) ions decreased five-fold selectivity of ion separation process.

PL

W pracy przedstawiono wyniki badań selektywnego rozdziału jonów kobaltu(II), niklu(II), cynku(II) i kadmu(II) z roztworów chlorkowych w procesie selektywnego ich rozdziału w procesie membranowym przez polimerowe membrany inkluzyjne (PIM). Jako przenośnik zastosowano 1-decyloimidazol. Uzyskane wyniki wskazują, że obecność jonów niektórych metali pogarszać może selektywność rozdziału. Szczególne znaczenie mają tutaj jony cynku(II) oraz kadmu(II), które prawie 5-krotnie pogarszają selektywność rozdziału jonów niklu(II) od kobaltu(II).

14

Uptake of Molecular Oxygen by Co(II) Chelates with Peptides in Aqueous Solution. Part XII. Non-covalent Interactions in the Cobalt(II) - Diastereoisomeric Phenylalanyl Dipeptide Systems. Effect on Kinetics of Oxygenation

Kufelnicki A., Świątek A.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 5

981-991

EN

The interactions of Co(II) with a group of diastereoisomeric dipeptides containing a side chain with the aromatic phenyl ring have been studied in aqueous solution, both under inert atmosphere and in the presence of dioxygen. An effect of stereoselectivity has been observed in the metal promoted deprotonations, examined by glass electrode potentiometry and correlated with the results of UV/Vis spectroscopy. The kinetics of oxygenation were studied by the stopped flow method and related to the potentiometric results.

15

Selective removal of Cu(II), Co(II), Zn(II), and Ni(II) with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ion carriers in polymer inclusion membrane transport

Kozłowski C. A., Walkowiak W.

Ars Separatoria Acta

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2007

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No. 5

19-26

EN

A selective removal of transition metal cations, i.e. Cu(II), Co(II), Zn(II), and Ni(II), with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ionic carriers in transport across polymer inclusion membrane has been presented. The competitive transport from aqueous nitrate solutions containing metal ions at concentrations of 0.0010 M at pH 4.0 and 7.0 through the cellulose triacetate membrane with 0.5 M lariat ether 1 and 2 (based on a plasticizer) as the ion carrier and o-nitrophenyl pentyl ether (ONPPE) as the plasticizer into 0.5 M hydrochloric solution was performed. For pH = 4.0 and 7.0 of source aqueous phases the selectivity orders were as follows: Cu(II) > Co(II) > Zn(II) > Ni(II), and Cu(II) > Zn(II), Ni(II), Co(II), respectively. The semi-empirical equation was used for calculations of enthalpy formation for complexes of lariat ethers studied with transition metal cations. The two possibilities of metal cation-lariat ether coordination were assumed, i.e. via the crown ether cavity or ionizable carboxylic group. We found that for the both lariat ethers studied at pH 4.0 of source phase the transport rate linearly decreases with the enthalpy of formation increase. This correlation confirms that the observed behavior is connected with the stability of complexes formed by interaction of the lariat ether ring and the transition metal cations studied.

16

Synthesis and Characterization of a New 4-Methoxysalicyliden-p-aminoacetophenoneoxime and Its Complexes with Co(II), Cu(II) and Zn(II)

Tuna S., Canpolat E., Kaya M.

Polish Journal of Chemistry

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2006

|

Vol. 80, nr 10

1651-1656

EN

The novel Schiff base ligand, 4-methoxysalicyliden-p-aminoacetophenoneoxime (LH) was synthesized starting from p-aminoacetophenoneoxime and 4-methoxysalicylaldehyde. Mononuclear cobalt(II), copper(II) and zinc(II) complexes of the ligand have been prepared by using Co(II), Cu(II) and Zn(II) salt with a metal to ligand ratio of 1:2. The structures of the ligand and its complexes were identified by using elemental analyses, IR, 1H- and 13C-NMR spectra, magnetic susceptibility measurements, UV spectra and thermogravimetric analyses (TGA).

17

Equilibria in Cobalt(II) - Amino Acid - Imidazole System under Oxygen-free Conditions. Part I. Studies on Mixed Ligand Systems with L-alfa-Alanine

Woźniczka M., Pająk M., Vogt A., Kufelnicki A.

Polish Journal of Chemistry

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2006

|

Vol. 80, nr 12

1959-1966

EN

Glass electrode potentiometry and UV/Vis spectrophotometry experiments have been carried out in order to determine the equilibria in an oxygen-free Co(II)-Amac-Himid system in aqueous solution, where Amac = L-alfa-alanine and Himid = 1,3-diazole (imidazole). The presence of axial imidazole in the structure of the ternary complex was implicated by using a [Co(imid)2]n polymer as starting material. Two proposed coordination modes of the mixed-ligand complex have been confirmed both by suitable experimental methods and by a fitting procedure (using EMF and absorbance data). One of these coordination modes is known as a model imitating the metal center in hemoglobin, whereas the other one has not been considered as yet.

18

Synthesis, Characterization and Redox Properties of Novel vic-Dioximes and Their Complexes with Nickel(ii), Copper(II) and Cobalt(II)

Tas E., Aslanoglu M., Kilic A., Ulusoy M ., Guler M.

Polish Journal of Chemistry

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2005

|

Vol. 79 / nr 11

1739-1747

EN

Two novel vic-dioxime, 1,2-dihydroxyimino-1-p-tolyl-3-aza-6-imidazole heptane (L1H2) and N-(ethyl-4-amino-1-piperidine carboxylate)-p-tolylglyoxime (L2H2) were prepared by the reaction of anti-p-tolylchloroglyoxime with 1-(3-aminopropyl)imidazole and ethyl-4-amino-1-piperidine carboxylate in absolute THF. Mononuclear complexes with a metal-ligand ratio of 1:2 were prepared using Co(II), Cu(II) and Ni(II) salts. The ligands and their Co(II), Cu(II) and Ni(II) com plexes were characterized by elemental analyses, FT-IR, UV-Vis, 1H-NMR and 13C-NMR and magnetic susceptibility measurements. The electrochemical behaviour of the complexes was investi ated by cyclic voltammetry in dimethylsulfoxide. All metal complexes showed metal centered quasi reversible one-electron redox processes. How ever, metal complexes of the L2H2 ligand also ex hibited ligand based irreversible redox waves.

19

Application of TBP in selective removal of iron(III) in solvent extraction and transport through polymer inclusion membranes processes

Pośpiech B., Walkowiak W., Woźniak M. J.

Physicochemical Problems of Mineral Processing

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2005

|

Vol. 39

89-98

EN

The separation of iron(IIl) from chloride aqueous solutions containing Mn(II), Ni(II), Co(II) and Cu(ll) by solvent extraction and transport through polymer inclusion membranes (PIMs) processes was studied. Tributyl phosphate (TBP) was used as the extractant/ion carrier. Extraction of Fe(lII) increased with increasing of extractant concentration in the organic phase. The selective transport of Fe(lll) from aqueous chloride source phase through PIM containing cellulose triacatate (CTA) as the support, ο-nitrophenyl octyl ether (ONPOE) as the plasticizer and TBP as the ion carrier has been studied. The influence of the ion carrier and plasticizer concentration on the transport metal ions was investigated. The results show that Fe(III) can be separated very effectively from others metal ions. The atomic force microscopy (AFM) was used to obtain images of the pores in cellulose triacetate membranes containing a plasticizer.

PL

W pracy przedstawiono wyniki badań selektywnego wydzielania Jonów Fe(III) z wodnego roztworu chlorkowego zawierającego jony Mn(II), Ni(II), Cu(II) i Co(II) w procesie ekstrakcji cieczowej i transportu przez polimerowe membrany inkluzyjne. W roli ekstrahenta/przenośnika jonów użyto fosforanu tributylu (TBP). Zbadano zależność wydajności ekstrakcji od stężenia ekstrahenta. Wydajność ekstrakcji żelaza(III) wzrastała ze wzrostem stężenia TBP w nafcie. Najwyższy procent ekstrakcji jonów Fe(III) uzyskano przy 2,0 i 3,6 M TBP i wynosił on odpowiednio 99,5 i 99,8 %. Określono także wpływ zawartości plastyfikatora oraz przenośnika jonów w membranie na transport jonów żelaza(III) z kwaśnego roztworu chlorków Mn(II), Ni(II), Cu(II) i Co(II). W tych warunkach procesu transportu nie stwierdzono obecności jonów tych metali w fazie odbierającej. Ze wzrostem zawartości ONPOE od 0,6 do 2.0 cm3/g CTA wartość strumieni początkowych wzrastała. Przy stężeniu plastyfikatora wynoszącym 2,0 cm3/g CTA strumień początkowy wynosił 32,90 μmol/n2s. Z kolei wzrost stężenia przenośnika w membranie w zakresie od 0,5 do 1,5 M TBP (w przeliczeniu na objętość plastyfikatora) powodował wzrost wartości współczynnika przepuszczalności. Dalsze zwiększanie zawartości TBP nie wpływało na szybkość procesu. Wykorzystując mikroskopię sił atomowych (AFM) wykonano także analizę struktury powierzchni membrany zawierającej TBP, ONPOE i CTA oraz membrany z samego CTA.

20

Selective removal of transition metal ions in transport through polymer inclusion membranes with organophosphorus acids

Ulewicz M., Walkowiak W.

Environment Protection Engineering

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2005

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Vol. 31, nr 3-4

73-82

EN

Separation of transition metal ions from aqueous chloride solutions by transport through polymer inclusion membrane (PIM) process is presented. The competitive transport of equimolar mixtures of Zn(II) and Cd(II) as well as Zn(II), Cu(II), Co(II), Cd(II), and Ni(II) was investigated. The selective transport of metal ions from aqueous chloride source phase through PIM-containing cellulose triacetate (support), o?nitrophenyl pentyl ether (plasticizer) and organophosphorus acidic compounds, i.e. di(2-ethylhexyl)phosphoric acid (D2EHPA), di(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272), di(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301) and bis(2,4,4-trimethylpentyl)monothiophosphinic acid (Cyanex 302) as ion carriers, is shown. The influence of extractant nature on the selectvity and efficiency of cation transport has been examined. Zn(II) can be effectively removed from dilute aqueous chloride solutions containing equilmolar mixture of Zn(II) and Cd(II) ions in transport through PIMs with di(2,4,4-trimethylpentyl)phosphinic acids, bis(2,4,4-trimethylpentyl)monothiophosphinic acid or di(2-ethylhexyl)phosphoric acid as the ionic carriers into 1.0 M HCl as the receiving phase. The per cent removal of Zn(II) and Cd(II) ions increases with an increase in pH, but more efficient separation of Zn(II) than Cd(II) ions decreases with pH increase in the source phase. Zn(II) can be also effectively removed from dilute aqueous chloride solutions containing equimolar mixture of Zn(II), Cd(II), Cu(II), Co(II) and Ni(II) ions by its transport through PIMs with D2EHPA, Cyanex 272 and Cyanex 302. All ions investi-gated are effectively removed with di(2,4,4-trimethylpentyl)dithio-phosphinic acids (Cyanex 301) as the ionic carrier into 1.0 M HCl as the receiving phase. The per cent removal of all metal ions investigated increases with an increase in pH of solution in the source phase. The initial transport fluxes of all metal ions through PIM with Cyanex 272 increase with an increase in an initial chloride acid concentration in the receiving phase.