PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Том LVI 2019

Мykhaylo YATSYSHYN1, Veronika DOZHDZHANYK1, Solomiia NESTERIVS’KA1, Nestor GERMAN1, Nataliya DUMANCHUK2, Roman SERKYZ1, Oleksander RESHETNYAK1

1Ivan Franko National University of Lviv Kyryla and Mefodia Str. 6, 79005 Lviv, Ukraine
22L’viv Medical Institute, Polishchuka Str. 76, L’viv 79015, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2019.56.130

SYNTHESIS OF THE ZEOLITE/POLYANILINE COMPOSITES AND THEIR APPLICATION FOR THE DISPOSAL OF Cr(VI) FROM WATER SOLUTIONS

Polyaniline (PAn) and zeolite/polyaniline composites (Zt/PAn) were synthesized by chemical oxidative polycondensation of 0,5 M aniline by 0,55 M ammonium peroxydisulfate in the 0,5 M sulphuric acid aqueous solutions. The weight ratio of aniline: zeolite in the reaction mixture was 1 : 1; 1 : 5 and 1 : 10. The X-ray analysis of the powders of produced samples has been carried out using a Dron-4-07 diffractometer (Cu Kα radiation; λ=1.54060 Å) in the reflection mode. Fourier-transform infrared (FTIR) spectrа of samples were recorded out using a NICOLET IS 10 ATR spectrophotometer in the mode of reflection, which was later transformed into transmission mode. The electrical conductivity of the tableted samples was determined by measuring their resistance in the "sandwich" type cells at a temperature of 20±1°С using a Rigol DM 3 068 device for resistance measuring. Scanning electron microscopy images and results of energy dispersive X-ray spectroscopy of the samples has been received with use of РЕММА 102-01 electron microscope.
It has been determined that the structure of polyaniline in both purely polymeric samples and samples of zeolite/polyaniline composites is mainly amorphous with an inconsiderable inclusion of the crystalline phase of polyaniline. There is interphase interaction between the macromolecular chains of polyaniline and the zeolite surface due to the formation of hydrogen bonds. Polyaniline in the synthesized samples is in the doped state, exactly in the form of the emeraldine salt of sulfate acid, which is an important factor for the use of these samples as adsorbents of Cr(VI). It was determined that the sorption of Cr(VI) ions from aqueous solutions occurs both on the macromolecular chains of polyaniline and on the surface of zeolite particles. In particular, the sorption by synthesized samples of individual PAn and Zt/PAn(1) composite occurs in a short time and mainly on the surface of the polymer. At the same time, the duration of the process for of samples of composites with a significantly higher content of zeolite increases by more than an order precisely due to the additional sorption of Cr(VI) ions on the surface of the particles of mineral filler.

Keywords: polyaniline, zeolite, composite materials, structure, Cr(VI) ions, sorption.

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How to Cite

Yatsyshyn М., Dozhdzhanyk V., Nesterivs’ka S., German N., Dumanchuk N., Serkyz R., Reshetnyak O. SYNTHESIS OF THE ZEOLITE/POLYANILINE COMPOSITES AND THEIR APPLICATION FOR THE DISPOSAL OF Cr(VI) FROM WATER SOLUTIONSF Proc. Shevchenko Sci. Soc. Chem. Sci. 2019 Vol. LVI. P. 130-143.

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