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Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels

In this work, starch/poly(acylic acid) hydrogels were synthesized through a free radical polymerization technique. The molar ratios of acrylic acid to N,N′-methylenebisacrylamide were 95:5, 94:6, and 93:7. The samples exhibited an amorphous porous structure, indicating that the size of the pores was...

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Autores principales: Mohammadzadeh, Fatemeh, Golshan, Marzieh, Haddadi-Asl, Vahid, Salami-Kalajahi, Mehdi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10366085/
https://www.ncbi.nlm.nih.gov/pubmed/37488175
http://dx.doi.org/10.1038/s41598-023-39241-z
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author Mohammadzadeh, Fatemeh
Golshan, Marzieh
Haddadi-Asl, Vahid
Salami-Kalajahi, Mehdi
author_facet Mohammadzadeh, Fatemeh
Golshan, Marzieh
Haddadi-Asl, Vahid
Salami-Kalajahi, Mehdi
author_sort Mohammadzadeh, Fatemeh
collection PubMed
description In this work, starch/poly(acylic acid) hydrogels were synthesized through a free radical polymerization technique. The molar ratios of acrylic acid to N,N′-methylenebisacrylamide were 95:5, 94:6, and 93:7. The samples exhibited an amorphous porous structure, indicating that the size of the pores was contingent upon the amount of cross-linking agent. The quantity of acrylic acid in structure rose with a little increase in the amount of the cross-linking agent, which improved the hydrogels’ heat stability. The swelling characteristics of the hydrogels were influenced by both the pH level and the amount of cross-linking agent. The hydrogel with a ratio of 94:6 exhibited the highest degree of swelling (201.90%) at a pH of 7.4. The dominance of the Fickian effect in regulating water absorption in the synthesized hydrogels was demonstrated, and the kinetics of swelling exhibited agreement with Schott's pseudo-second order model. The absorption of methylene blue by the hydrogels that were developed was found to be influenced by various factors, including the concentration of the dye, the quantity of the cross-linking agent, the pH level, and the duration of exposure. The hydrogel 95:5 exhibited the highest adsorption effectiveness (66.7%) for the dye solution with a concentration of 20 mg/L at pH 10.0. The examination of the kinetics and isotherms of adsorption has provided evidence that the process of physisorption takes place on heterogeneous adsorbent surfaces and can be explained by an exothermic nature.
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spelling pubmed-103660852023-07-26 Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels Mohammadzadeh, Fatemeh Golshan, Marzieh Haddadi-Asl, Vahid Salami-Kalajahi, Mehdi Sci Rep Article In this work, starch/poly(acylic acid) hydrogels were synthesized through a free radical polymerization technique. The molar ratios of acrylic acid to N,N′-methylenebisacrylamide were 95:5, 94:6, and 93:7. The samples exhibited an amorphous porous structure, indicating that the size of the pores was contingent upon the amount of cross-linking agent. The quantity of acrylic acid in structure rose with a little increase in the amount of the cross-linking agent, which improved the hydrogels’ heat stability. The swelling characteristics of the hydrogels were influenced by both the pH level and the amount of cross-linking agent. The hydrogel with a ratio of 94:6 exhibited the highest degree of swelling (201.90%) at a pH of 7.4. The dominance of the Fickian effect in regulating water absorption in the synthesized hydrogels was demonstrated, and the kinetics of swelling exhibited agreement with Schott's pseudo-second order model. The absorption of methylene blue by the hydrogels that were developed was found to be influenced by various factors, including the concentration of the dye, the quantity of the cross-linking agent, the pH level, and the duration of exposure. The hydrogel 95:5 exhibited the highest adsorption effectiveness (66.7%) for the dye solution with a concentration of 20 mg/L at pH 10.0. The examination of the kinetics and isotherms of adsorption has provided evidence that the process of physisorption takes place on heterogeneous adsorbent surfaces and can be explained by an exothermic nature. Nature Publishing Group UK 2023-07-24 /pmc/articles/PMC10366085/ /pubmed/37488175 http://dx.doi.org/10.1038/s41598-023-39241-z Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Mohammadzadeh, Fatemeh
Golshan, Marzieh
Haddadi-Asl, Vahid
Salami-Kalajahi, Mehdi
Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title_full Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title_fullStr Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title_full_unstemmed Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title_short Adsorption kinetics of methylene blue from wastewater using pH-sensitive starch-based hydrogels
title_sort adsorption kinetics of methylene blue from wastewater using ph-sensitive starch-based hydrogels
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10366085/
https://www.ncbi.nlm.nih.gov/pubmed/37488175
http://dx.doi.org/10.1038/s41598-023-39241-z
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