REMOVAL OF Cr(VI) BY NANOFILM OF POLYANILINE ON POLYETHYLENE TEREPHTHALATE SUBSTRATE

Yu. Stetsiv, N. Pandyak, O. Reshetnyak


DOI: http://dx.doi.org/10.30970/vch.6501.289

Abstract


In the present study, polyaniline (PAn) film deposited in situ on a flexible polyethylene terephthalate (PET) substrate was used to remove chromium(VI) from aqueous solution. 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.

Adsorption isotherm studies of Cr(VI) from aqueous solution are described. Equilibrium sorption of Cr(VI) by PAn films was determined using the Langmuir, Freundlich, Dubinin–Radushkevich and Temkin adsorption isotherm models. 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=0.99894). The maximum sorption capacity, estimated by the Langmuir isotherm, is ~78 mg/g. The order of adsorption of chromium was investigated by fitting the kinetic data to different kinetic models, such as Lagergren’s pseudo-first-order, pseudo-second-order and intraparticle Weber-Morris diffusion models. Our experimental kinetic data of Cr(VI) removal by the polyaniline film best fit the pseudo-second order kinetic model.

It was found that Cr(VI) adsorption by corresponds to the pseudo-second-order model. 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 results, 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, thin film, adsorption, Cr(VI) removal.


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