Abstract
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.
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04 October 2018
The original publication of this paper contains an error. The correct 4th heading in Table 1 should be “Non-linear sips isotherm”. The original article has been corrected.
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Acknowledgements
ATP and PBV thank the Brazilian fostering agency CAPES for the master scholarship.
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Brazilian fostering agency CNPq (Grant N° 312356/2015-3) for provided financial support.
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Responsible editor: Tito Roberto Cadaval Jr
The original version of this article was revised: The original publication of this paper contains an error. The correct 4th heading in Table 1 should be “Non-linear sips isotherm”.
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Vilela, P.B., Dalalibera, A., Duminelli, E.C. et al. Adsorption and removal of chromium (VI) contained in aqueous solutions using a chitosan-based hydrogel. Environ Sci Pollut Res 26, 28481–28489 (2019). https://doi.org/10.1007/s11356-018-3208-3
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DOI: https://doi.org/10.1007/s11356-018-3208-3