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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

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.

3

Badania właściwości pigmentów tlenkowych po narażeniach środowiskowych

Makarewicz E., Tworek M., Witt K., Shyychuk I., Ziółkowska D.

Przemysł Chemiczny

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2015

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T. 94, nr 1

50-56

PL

Przedstawiono wyniki badań wpływu wodnego roztworu kwasu siarkowego i zasady sodowej na niektóre właściwości termoodpornych tlenkowych pigmentów spinelowych. Za pomocą spektrometrii odbiciowej, fluorescencji rentgenowskiej, termograwimetrii, strukturalnej rentgenografii dyfrakcyjnej oraz adsorpcji błękitu metylenowego określono zmianę barwy, składu chemicznego, budowy krystalograficznej i powierzchni właściwej pigmentów oraz występowanie efektów cieplnych. Wskazano na negatywny wpływ środowisk chemicznych na właściwości powierzchniowe pigmentów oraz ich późniejsze zachowanie w powłoce malarskiej.

EN

Seven com. oxide pigments were studied for corrosion resistance in aq. solns. of H₂O₄ or NaOH by colorimetry, thermogravimetry, X-ray diffraction, chem. anal, and adsorption of methylene blue. Some changes in color and chem. compn. of the pigments were obsd. esp. in the case of Zn-contg. pigments.

4

Właściwości i zastosowanie diketonów i ich pochodnych

Urbaniak W., Jurek K., Witt K., Gorączko A., Staniszewski B.

Chemik

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2011

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Vol. 65, nr 4

273-282

PL

W ramach badań zostały zsyntetyzowane i przebadane metodą spektrofotometrii UV-Vis pochodne acetyloacetonu, m.in. takie jak: 3-allil-2,4-pentanodion, 3-benzylo-2,4-pentanodion, 3-butylo-2,4- pentanodion, benzoiloaceton, dibenzoilometan, 3-metyl-2,4-pentanodion, 3-trimetylosililopropylo-2,4-pentanodion, oraz ich związki kompleksowe z Cu(II) i Co(II). Wykonano również badania widm masowych EI kompleksów 2,4-pentanodionu z różnymi kationami metali, o wzorze ogólnym Me(acac) n , gdzie n=2-4. Ponadto przeprowadzono badania nad możliwością zastosowania acetyloacetonianowych pochodnych cyny(IV) jako prekursorów w metodzie zol-żel. Stwierdzono, że badane związki wykazują interesujące wła- ściwości spektroskopowe, charakteryzują się dużą stałą trwałości i mogą być z powodzeniem stosowane w wielu dziedzinach, m.in. jako prekursory w metodzie zol-żel i inne.

EN

Within the present research, acetylacetone derivatives have been synthesised and tested using UV-Vis spectrophotometry; the derivatives include: 3-allyl-2,4-pentanedione, 3-benzyl2,4-pentanedione, 3-butyl2,4-pentanedione, benzoylacetone, dibenzoylmethane, 3-methyl2,4-pentanedione, 3-trimethylsilylpropyl-2,4-pentanedione and their Cu(II) and Co(II) complex compounds. Furthermore, EI mass spectra were recorded of 2,4-pentanedione with various metal cations of general formula Me(acac) n , where n=2-4. The possibility of using acetylacetonate tin(IV)derivatives as precursors in the sol-gel method was also investigated. The compounds tested were found to have interesting spectroscopic properties, with high stability constants; they may be successfully used in various areas, e.g. as sol-gel precursors, etc.