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

Environmental Science and Pollution Research International
Pâmela Becalli VilelaAlexandre Tadeu Paulino

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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Citations

Jun 23, 2019·Environmental Science and Pollution Research International·Sheng XuMeng Cao
Aug 2, 2020·Environmental Science and Pollution Research International·Sheng XuZhenxi Wang
Jan 7, 2019·Environmental Science and Pollution Research International·Abu Nasar, Fouzia Mashkoor
Jan 9, 2021·Journal of Hazardous Materials·Ismaila Olalekan SaheedFaiz Bukhari Mohd Suah
Mar 3, 2021·Environmental Science and Pollution Research International·Ahsan MehmoodShaukat Ali Mazari
Aug 29, 2020·Journal of Environmental Management·Sirirat SangkarakJenyuk Lohwacharin
May 15, 2021·Environmental Science and Pollution Research International·Animes Kumar GolderRavi Ravi
Jun 7, 2021·Environmental Science and Pollution Research International·James Friday AmakuJeanet Conradie
Jul 3, 2021·Pharmaceutics·Cassiele T CescoAlexandre T Paulino
Nov 17, 2020·ACS Omega·Gunasunderi RajuAhmed Mohamed Ahmed Mohamed Eid

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