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1

Application of polymer inclusion membranes doped with 1-hexyl-4-methylimidazole for pertraction of zinc(II) and other transition metal ions

Ulewicz M., Radzyminska-Lenarcik E.

Physicochemical Problems of Mineral Processing

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2015

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Vol. 51, iss. 2

447--460

EN

Transport of Zn(II) from unary aqueous chloride solutions and from solutions which contain mixtures of Cd(II), Co(II) and Ni(II) ions in source phases (cMe = 0.001 mol/dm3, pH = 6.0) across polymer inclusion membranes (PIMs) doped with 1-hexyl-4-methylimidazole as ion carrier was studied. The use of 1-hexyl-4-methylimidazole enables the separation of 98.5% Zn(II) from a unary solution and 96.9% from a quaternary solution of Zn(II)-Cd(II)-Co(II)-Ni(II) after running the process for 24 hours. Using that ion carrier, the metals are transported in the following order: Zn(II) > Cd(II) > Ni(II) > Co(II), and the selectivity coefficients of Zn(II)/Cd(II), Zn(II)/Ni(II), and Zn(II)/Co(II) are 12.9, 23.4 and 40.8, respectively. Findings of atomic force microscopy (AFM) examinations as well as thermograms of a polymer inclusion membrane containing 1-hexyl-4-methylimidazole are also presented. A membrane with 1.0 mol/dm3 of carrier has a porosity of 15.8%, and roughness of 6.6 nm. The membranes remain thermally stable at temperatures up to 200oC. The findings were compared with earlier-reported results for 1-hexylimidazole.

2

Wpływ rodzaju kationu metalu i pochodnych imidazolowych na czas życia kompozycji epoksydowych oraz wytrzymałość połączeń klejowych na ścinanie

Pilawka R., Mąka H.

Przemysł Chemiczny

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2012

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T. 91, nr 1

100-105

PL

Przedstawiono wyniki prac związanych z możliwością zastosowania kompleksów kationów metali i pochodnych imidazolu jako środków sieciujących o charakterze utajonym, służących do utwardzania żywic epoksydowych. Otrzymano utwardzacze utajone na bazie kompleksów imidazolu i kationów metali przy stosunku molowym 4:1. Badano czas życia kompozycji, proces sieciowania metodą mikrokalorymetrii skaningowej DSC, spektrofotometrii w podczerwieni FTIR oraz reometrii przy użyciu aparatu ARES. Dodatkowo wyznaczono wytrzymałość na ścinanie łączeń klejowych uzyskanych po wymieszaniu składników oraz po 1 i 3 miesiącach przechowywania samej kompozycji klejowej. Użycie badanych kompleksów jako środków sieciujących spowodowało wydłużenie czasu życia kompozycji do 2 tygodni w przypadku kompleksów 1-butyloimidazolu oraz do trzech miesięcy w przypadku zastosowania kompleksów 2-etyloimidazolu.

EN

Six latent curing agents were prepd. by complexing Cu(II), Ni(II) and Co(II) ions with imidazole (I) derivatives (1:4 mole ratio) in aq. soln. for 30 min. Pot life times were measured by viscosity changes (ARES rheometer) and FTIR spectra during storage. The agents were then used for curing a com. epoxy resin in adhesive joints (Al plates) at 140°C for 4 h. The joints were studied for shear strength during storage. Use of the complexes resulted in extension of the pot life time of the epoxy compn. up to 1 month for 1-Bu-I complexes or up to 3 months for 2-Et-I complexes.

3

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.

4

The role of the side group in reactions involving 1-propyl-2-methylimidazole and 1-propyl-2-imidazole-carboxaldehyde and Co(II), Ni(II), Cu(II) and Zn(II) ions

Barszcz B., Kulig J., Jezierska J., Lisowski J.

Polish Journal of Chemistry

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1999

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vol. 73 nr 3

447-456

EN

The complexing properties of 1-propyl-2-methylimidazole (1-Pr-2-CH3Im) and 1-propyl-2-imidazolecarboxaldehyde (1-Pr-2-CHOIm) with CoII, NiII, CuII and ZnII were investigated pH-metrically at 25oC and at the ionic strength of 0.5 mol dm-3(KNO3). The stability constans calculated indicate the formation of complexes with metal: ligand ratio of 1:1, 1:2, 1:3, and 1:4. The stability of the metal complexes with both imidazoles depends mostly on the substituent situated between the nitrogen atoms of the imidazole ring. It was found that the carboxalaldehyde oxygen atom participates in the formation of the coordination bond. The formation of the weak chelate copper (II)-1-propyl-2-imidazolecarboxaldehyde complexes was confirmed by EPR spectra. The electronic spectra reveal that the cobalt(II) forms both tetrahedral and octahedral species with 1-Pr-2-CH3Im, but 1_Pr-2-CHIIm forms only six-coordinated compounds. The NMR spectra of 1_Pr-2-CHOIm indicate that hydration of the CHO takes place when Zn(II) ions are introduced into the ligand solution at pH5.03.