Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material

The treatment of wastewater requires the use of eco-friendly and cost-efficient adsorbents. A hybrid adsorbent film based on biodegradable polymers (poly(vinyl alcohol) (PVA) and chitosan (Ch) was developed to remove Acid Orange 7 (AO7), an azo dye from the textile industry present in industrial was...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Pérez Calderón, John Freddy, Marín Silva, Diego Alejandro, Zaritzky, Noemí Elisabet, Pinotti, Adriana Noemí
Formato: Articulo
Lenguaje:Inglés
Publicado: 2023
Materias:
Química
Hybrid film
Biosorbent
Azo dye
Chitosan
PVA
Physical cross-linking
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/160428
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-160428
record_format dspace
spelling I19-R120-10915-1604282023-11-22T20:07:06Z http://sedici.unlp.edu.ar/handle/10915/160428 Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material Pérez Calderón, John Freddy Marín Silva, Diego Alejandro Zaritzky, Noemí Elisabet Pinotti, Adriana Noemí 2023 2023-11-22T18:09:51Z en Química Hybrid film Biosorbent Azo dye Chitosan PVA Physical cross-linking The treatment of wastewater requires the use of eco-friendly and cost-efficient adsorbents. A hybrid adsorbent film based on biodegradable polymers (poly(vinyl alcohol) (PVA) and chitosan (Ch) was developed to remove Acid Orange 7 (AO7), an azo dye from the textile industry present in industrial wastewaters. The polymeric absorbent material was submitted to a curing process with different timetemperature combinations which improved its physical stability in aqueous media. This result was supported by modulated differential scanning calorimetry (MDSC) and thermogravimetric analysis (TGA). ATR-FTIR also confirmed the electrostatic interactions by hydrogen bonds between PVA and Ch, as well as among the polymers and the dye. The best curing condition to reach a high removal without weight loss was the combination of 160 C-1h. Dye adsorption depended mainly on pH, adsorbent dose, contact time, temperature, and coexisting anions. The maximum removal efficiency (>91%) was achieved at pH ¼ 2.5. The adsorption kinetics followed the Lagergren pseudo first-order rate equation and the adsorption isotherm was best described by the Redlich-Peterson model. As far as the authors know, the maximum adsorption capacity (Qm) of the adsorbent film obtained in the present work is the highest value reported in literature (Qm ¼ 678 mg/g at 298 K and pH ¼ 2.5). Physisorption would be the dominant mechanism at pH 4.0 while at pH 2.5 the process was conducted by chemisorption. Regeneration studies showed that composites could be used for five consecutive cycles without losing their adsorption capacity. Thus, the use of the developed eco-compatible biodegradable materials would allow easy regeneration without losing removal selectivity, a key feature in the development of environmentally friendly sorbent materials. Centro de Investigación y Desarrollo en Criotecnología de Alimentos Articulo Articulo http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Hybrid film
Biosorbent
Azo dye
Chitosan
PVA
Physical cross-linking
spellingShingle Química
Hybrid film
Biosorbent
Azo dye
Chitosan
PVA
Physical cross-linking
Pérez Calderón, John Freddy
Marín Silva, Diego Alejandro
Zaritzky, Noemí Elisabet
Pinotti, Adriana Noemí
Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
topic_facet Química
Hybrid film
Biosorbent
Azo dye
Chitosan
PVA
Physical cross-linking
description The treatment of wastewater requires the use of eco-friendly and cost-efficient adsorbents. A hybrid adsorbent film based on biodegradable polymers (poly(vinyl alcohol) (PVA) and chitosan (Ch) was developed to remove Acid Orange 7 (AO7), an azo dye from the textile industry present in industrial wastewaters. The polymeric absorbent material was submitted to a curing process with different timetemperature combinations which improved its physical stability in aqueous media. This result was supported by modulated differential scanning calorimetry (MDSC) and thermogravimetric analysis (TGA). ATR-FTIR also confirmed the electrostatic interactions by hydrogen bonds between PVA and Ch, as well as among the polymers and the dye. The best curing condition to reach a high removal without weight loss was the combination of 160 C-1h. Dye adsorption depended mainly on pH, adsorbent dose, contact time, temperature, and coexisting anions. The maximum removal efficiency (>91%) was achieved at pH ¼ 2.5. The adsorption kinetics followed the Lagergren pseudo first-order rate equation and the adsorption isotherm was best described by the Redlich-Peterson model. As far as the authors know, the maximum adsorption capacity (Qm) of the adsorbent film obtained in the present work is the highest value reported in literature (Qm ¼ 678 mg/g at 298 K and pH ¼ 2.5). Physisorption would be the dominant mechanism at pH 4.0 while at pH 2.5 the process was conducted by chemisorption. Regeneration studies showed that composites could be used for five consecutive cycles without losing their adsorption capacity. Thus, the use of the developed eco-compatible biodegradable materials would allow easy regeneration without losing removal selectivity, a key feature in the development of environmentally friendly sorbent materials.
format Articulo
Articulo
author Pérez Calderón, John Freddy
Marín Silva, Diego Alejandro
Zaritzky, Noemí Elisabet
Pinotti, Adriana Noemí
author_facet Pérez Calderón, John Freddy
Marín Silva, Diego Alejandro
Zaritzky, Noemí Elisabet
Pinotti, Adriana Noemí
author_sort Pérez Calderón, John Freddy
title Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
title_short Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
title_full Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
title_fullStr Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
title_full_unstemmed Eco-friendly PVA-chitosan adsorbent films for the removal of azo dye Acid Orange 7: physical cross-linking, adsorption process, and reuse of the material
title_sort eco-friendly pva-chitosan adsorbent films for the removal of azo dye acid orange 7: physical cross-linking, adsorption process, and reuse of the material
publishDate 2023
url http://sedici.unlp.edu.ar/handle/10915/160428
work_keys_str_mv AT perezcalderonjohnfreddy ecofriendlypvachitosanadsorbentfilmsfortheremovalofazodyeacidorange7physicalcrosslinkingadsorptionprocessandreuseofthematerial
AT marinsilvadiegoalejandro ecofriendlypvachitosanadsorbentfilmsfortheremovalofazodyeacidorange7physicalcrosslinkingadsorptionprocessandreuseofthematerial
AT zaritzkynoemielisabet ecofriendlypvachitosanadsorbentfilmsfortheremovalofazodyeacidorange7physicalcrosslinkingadsorptionprocessandreuseofthematerial
AT pinottiadriananoemi ecofriendlypvachitosanadsorbentfilmsfortheremovalofazodyeacidorange7physicalcrosslinkingadsorptionprocessandreuseofthematerial
_version_ 1807221903092350976

Ejemplares similares