Development of a biosponge based on Luffa cylindrica and crosslinked chitosan for Allura red AC adsorption
Autor: | Guilherme Luiz Dotto, Janaína Oliveira Gonçalves, Evandro S. Mallmann, Diana Pinto, Rejiane da Rosa Schio |
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Rok vydání: | 2021 |
Předmět: |
Allura Red AC
Biochemistry Water Purification Chitosan chemistry.chemical_compound Crosslinked chitosan Adsorption Structural Biology medicine Epichlorohydrin Molecular Biology Aqueous solution Spectrum Analysis Temperature General Medicine Models Theoretical Kinetics chemistry Glutaraldehyde Swelling medicine.symptom Luffa Azo Compounds Water Pollutants Chemical Nuclear chemistry |
Zdroj: | International journal of biological macromolecules. 192 |
ISSN: | 1879-0003 |
Popis: | A new bioadsorbent from Luffa cylindrica and cross-linked chitosan was proposed in the present study. Luffa was used as a natural support medium for chitosan crosslinked with glutaraldehyde (LCsG) and epichlorohydrin (LCsE). Biosponges were applied to remove Allura red from aqueous solutions. LCsG and LCsE were produced using different concentrations of chitosan (1%, 3% and 5% (m v−1)) and crosslinking agents (0.5%, 1.0% and 1.5% (v v−1)). Based on the FT-IR spectra, functional groups characteristic of chitosan crosslinked with glutaraldehyde and epichlorohydrin confirmed the crosslinking. In addition, the biosorbent revealed highly efficient functional groups and morphology with irregularities favorable for adsorption. It was found that the increase in the percentage of glutaraldehyde and epichlorohydrin increased the sample's swelling degree, and the degree of cross-linking was greater than 80% for all LCsG. The results regarding the degree of swelling and degree of crosslinking corroborated with the evaluation of the biosponge's adsorptive potential. The Sips model predicted the equilibrium isotherms, with a maximum adsorption capacity of 89.05 mg g−1 for LCsG and 60.91 mg g−1 for LCsE. The new procedure was successful. Luffa was excellent support for chitosan, resulting in an attractive, low-cost bioadsorbent, preventing renewable sources. |
Databáze: | OpenAIRE |
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