Adsorption and removal of chromium (VI) contained in aqueous solutions using a chitosan-based hydrogel

The aim of this work was to study the adsorption and removal of chromium (VI) ions contained in aqueous solutions using a chitosan-based hydrogel synthesized via chemical crosslinking of radical chitosan, polyacrylic acid, and N , N ′-methylenebisacrylamide. Fourier-transform infrared spectroscopy c...

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Veröffentlicht in:Environmental science and pollution research international 2019-10, Vol.26 (28), p.28481-28489
Hauptverfasser: Vilela, Pâmela Becalli, Dalalibera, Amanda, Duminelli, Eduardo Costa, Becegato, Valter Antonio, Paulino, Alexandre Tadeu
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Sprache:eng
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Zusammenfassung:The aim of this work was to study the adsorption and removal of chromium (VI) ions contained in aqueous solutions using a chitosan-based hydrogel synthesized via chemical crosslinking of radical chitosan, polyacrylic acid, and N , N ′-methylenebisacrylamide. Fourier-transform infrared spectroscopy confirmed the hydrogel synthesis and presence of reactive functional groups for the adsorption of chromium (VI) ions. The chromium (VI) adsorption mechanism was evaluated using non-linear Langmuir, Freundlich, Redlich-Peterson, and Sips isotherms, with the best fit found by the non-linear Redlich-Peterson isotherm. The maximum chromium (VI) adsorption capacities of the chitosan-based hydrogel were 73.14 and 93.03 mg metal per g dried hydrogel, according to the non-linear Langmuir and Sips isotherm models, respectively. The best kinetic fit was found with the pseudo-nth order kinetic model. The chromium (VI) removal percentage at pH 4.5 and 100 mg L −1 initial metal concentration was 94.72%. The results obtained in this contribution can be useful for future works involving scale-up of a water and wastewater treatment method from a pilot plant to full-scale plant.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-018-3208-3