We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Adsorption and removal of chromium (VI) contained in aqueous solutions using a chitosan-based hydrogel.
- Authors
Vilela, Pâmela Becalli; Dalalibera, Amanda; Duminelli, Eduardo Costa; Becegato, Valter Antonio; Paulino, Alexandre Tadeu
- 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.
- Subjects
HYDROGELS; POLYACRYLIC acid; AQUEOUS solutions; CHROMIUM; ADSORPTION (Chemistry); RADICALS (Chemistry); LANGMUIR isotherms
- Publication
Environmental Science & Pollution Research, 2019, Vol 26, Issue 28, p28481
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-018-3208-3