We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Performance of oxalic acid-chitosan/alumina ceramic biocomposite for the adsorption of a reactive anionic azo dye.
- Authors
Pérez-Calderón, John; Scian, Alberto; Ducos, Martin; Santos, Victoria; Zaritzky, Noemí
- Abstract
A biocomposite system was developed and tested for the removal of the azo dye Reactive Red (RR195) from wastewater. The biocomposite was synthesized using ceramic particles containing 75% alumina which were coated using chitosan cross-linked with oxalic acid. The biocomposite showed high performance at low pH (maximum adsorption capacity = 345.3mg.g−1 at pH=2.0). The physicochemical and structure characteristics of the matrix were evaluated by Z-potential, FTIR-ATR, SEM-EDS, XRD, and porosity. Langmuir sorption isotherm and pseudosecond-order model gave the best fit. The electrostatic interaction between RR195 (due to the sulfonate groups) and the free amino groups of chitosan, enabled successive desorption/regeneration cycles. The maximum removal percentage (>80%) occurred at pH=2.0 due to the cross-linking effect. Experiments at different temperatures allowed the calculation of thermodynamic parameters (ΔG, ΔS, ΔH); adsorption was spontaneous, exothermic, and enthalpy controlled. The presence of inorganic ions ( S O 4 2 − > N O 3 − > C l − ) was analyzed during the adsorption process. This novel biocomposite can be applied as a cost-effective and environmentally friendly adsorbent for anionic azo dye removal from wastewater. The application of chitosan cross-linked with oxalic acid as a coating of the ceramic support enhanced the adsorption capacity and enabled its use under acidic conditions without solubilization.
- Subjects
AZO dyes; ADSORPTION (Chemistry); LANGMUIR isotherms; OXALIC acid; ADSORPTION capacity; DISTRIBUTION isotherms (Chromatography); BIOELECTROCHEMISTRY; CERAMIC coating
- Publication
Environmental Science & Pollution Research, 2021, Vol 28, Issue 47, p67032
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-021-15123-7