Chromium(VI) removal from aqueous solutions using a polyethylenimine-epichlorohydrin resin

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Abstract

The ability of the synthesized polyethylenimine-epichlorohydrin resin to remove Cr(VI) from aqueous solutions was investigated in the absence (initial pH 2-7) and presence of background electrolytes (NaNO3 and Na2SO4 solutions of initial pH 3 and 6). The determined Cr uptake was significantly higher than the one reported for the majority of other sorbents. The photometrically determined uptake data were modeled by the Langmuir, Redlich-Peterson, Langmuir-Freundlich and Toth equation. The modeling results did not indicate any preference to one specific model in terms of the goodness-of-fit and the prediction of maximum sorption capacity. The Cr-sorption kinetics were investigated at 15, 25, 35 and 45 °C using 51Cr-labeled solutions and γ-ray spectroscopy. The Cr-sorption was very fast at all studied temperatures and well reproduced by the pseudo-second order kinetics equation. The rate constant and activation energy values were calculated using the experimental data. The Cr-loaded resin was also examined by XRD, XPS, XAFS and SEM//EDS. The XPS and XAFS investigations indicated a partial reduction of Cr(VI) to Cr(III). The environmental compatibility of the Cr-loaded resin was examined using the EPA-TCLP method. The Cr-binding by the resin was very stable and regeneration attempts with HCl solutions of pH 3 were rather unsuccessful.

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Sarri, S., Misaelides, P., Zamboulis, D., Noli, F., Warchoł, J., Pinakidou, F., & Katsikini, M. (2016). Chromium(VI) removal from aqueous solutions using a polyethylenimine-epichlorohydrin resin. Journal of the Serbian Chemical Society, 81(11), 1321–1333. https://doi.org/10.2298/JSC160419061S

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