PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXXIII 2023

Yuliia STETSIV1, Viktoriia SHINGELSKA1, Mykhaylo YATSYSHYN1, Аnatoliy ZELINSKIY1, Halyna STETSIV2, Oleksandr RESHETNYAK1

1Ivan Franko National University of Lviv, Kyryla i Mefodiya Str., 6, 79005 Lviv, Ukraine
e-mail: yuliia.stetsiv@lnu.edu.ua

2Lviv State College of Food and Processing Industry of the National University of Food Technologies Pulyuya str., 42, 79060 Lviv, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2023.73.095

POLYANILINE NANOFILM ON POLYETHYLENE TEREPHTHALATE SUBSTRATE AS A Cr(VI) ADSORBENT

This work deals with the use of a polyaniline (PAn) film deposited in situ on a flexible polyethylene terephthalate (PET) substrate-matrix as an adsorbent for the adsorption and reduction of toxic Cr(VI) to less toxic Cr(III).
Adsorption of Cr(VI) from aqueous solutions was studied on a polyaniline film obtained on a PET matrix substrate, washed several times with distilled water after synthesis and dried at room temperature. Research on Cr(VI) adsorption was carried out from solutions of different concentrations, namely: 10; 20; 30; 40 and 50 mg/l. The change in Cr(VI) content was followed by electronic spectra using a UV-Vis spectrophotometer. It is shown that practically 80–85% of Cr(VI) is adsorbed by polyaniline films both doped with citric acid during the synthesis and additionally doped with citric acid. It was established that polyaniline is oxidized to pernigraniline during the reduction of Cr(VI) to Cr(III).
Equilibrium sorption of Cr(VI) by PAn films was studied using two-parameter levels of isotherms: Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms. The obtained results confirm that the sorption of Cr(VI) on the polyaniline film is best described by the Langmuir isotherm, as evidenced by the highest value of the coefficient of determination (R2=0.9988). The maximum sorption capacity, estimated by the Langmuir isotherm, is ~55 mg/g. It was found that Cr(VI) adsorption corresponds to the pseudo-second-order model, as well as the Elovovich model, which indicates the chemical nature of Cr(VI) adsorption by the polyaniline film. Desorption and regeneration experiments of polyaniline films on a PET matrix substrate were performed and reused for three consecutive cycles.
Adsorption studies revealed that polyaniline films on the surface of chemically resistant PET films can be effective adsorbents of Cr(VI) from aqueous solutions of low concentrations of Cr(VI). According to the research result s, easy-to-prepare, ecological and effective adsorbents based on polyaniline films on flexible film substrates made of polyethylene terephthalate can be proposed for the removal of Cr(VI) from aqueous solutions.

Keywords: polyaniline, polyethyleneterephthalate, citric acid, chromium, adsorption.

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How to Cite

STETSIV Yu., SHINGELSKA V., YATSYSHYN M., ZELINSKIY A., STETSIV H., RESHETNYAK O. POLYANILINE NANOFILM ON POLYETHYLENE TEREPHTHALATE SUBSTRATE AS A Cr(VI) ADSORBENT Proc. Shevchenko Sci. Soc. Chem. Sci. 2023. Vol. LXXIII. P. 95-113.

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