Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels

Adsorption using natural compounds is an attractive separation technique for recovering heavy metals from aqueous media. Although chitosan, which is a natural polysaccharide, is an environmentally benign adsorbent, it dissolves in an acidic aqueous medium. In this study, we prepared adsorbents consi...

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Autores principales:	Takaaki Tatsumi, Yoshiro Tahara, Michiaki Matsumoto
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	chitosan adsorption metal ion ionic liquid Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/0f281d882a064595a018747aeead9f1f
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spelling	oai:doaj.org-article:0f281d882a064595a018747aeead9f1f2021-11-25T18:59:19ZAdsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels10.3390/separations81102022297-8739https://doaj.org/article/0f281d882a064595a018747aeead9f1f2021-11-01T00:00:00Zhttps://www.mdpi.com/2297-8739/8/11/202https://doaj.org/toc/2297-8739Adsorption using natural compounds is an attractive separation technique for recovering heavy metals from aqueous media. Although chitosan, which is a natural polysaccharide, is an environmentally benign adsorbent, it dissolves in an acidic aqueous medium. In this study, we prepared adsorbents consisting of chitosan modified with amidoxime groups for improving metal adsorptivity, and cellulose for improving gel stability using an ionic liquid, and examined their adsorption characteristics for metal ions. The prepared amidoxime-chitosan/cellulose hydrogels had a mechanical strength without cross-linking. All the investigated metals were adsorbed on the amidoxime-chitosan/cellulose hydrogels in the following adsorptivity order: Cu ≈ Ag > Ni > Zn. The adsorptivity of the metal ions increased with pH due to a proton exchange reaction. From the Langmuir adsorption isotherm, the Langmuir constant for Cu exceeded those of other metals because amidoxime has higher Cu affinity. The pseudo-second-order reaction model best described the adsorption kinetics with metal chelate formation being the rate-determining step. Because amidoxime-chitosan/cellulose hydrogels had higher physical stability and higher Cu selectivity, they were found to be a promising, environmentally benign adsorbent.Takaaki TatsumiYoshiro TaharaMichiaki MatsumotoMDPI AGarticlechitosanadsorptionmetal ionionic liquidPhysicsQC1-999ChemistryQD1-999ENSeparations, Vol 8, Iss 202, p 202 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chitosan adsorption metal ion ionic liquid Physics QC1-999 Chemistry QD1-999
spellingShingle	chitosan adsorption metal ion ionic liquid Physics QC1-999 Chemistry QD1-999 Takaaki Tatsumi Yoshiro Tahara Michiaki Matsumoto Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
description	Adsorption using natural compounds is an attractive separation technique for recovering heavy metals from aqueous media. Although chitosan, which is a natural polysaccharide, is an environmentally benign adsorbent, it dissolves in an acidic aqueous medium. In this study, we prepared adsorbents consisting of chitosan modified with amidoxime groups for improving metal adsorptivity, and cellulose for improving gel stability using an ionic liquid, and examined their adsorption characteristics for metal ions. The prepared amidoxime-chitosan/cellulose hydrogels had a mechanical strength without cross-linking. All the investigated metals were adsorbed on the amidoxime-chitosan/cellulose hydrogels in the following adsorptivity order: Cu ≈ Ag > Ni > Zn. The adsorptivity of the metal ions increased with pH due to a proton exchange reaction. From the Langmuir adsorption isotherm, the Langmuir constant for Cu exceeded those of other metals because amidoxime has higher Cu affinity. The pseudo-second-order reaction model best described the adsorption kinetics with metal chelate formation being the rate-determining step. Because amidoxime-chitosan/cellulose hydrogels had higher physical stability and higher Cu selectivity, they were found to be a promising, environmentally benign adsorbent.
format	article
author	Takaaki Tatsumi Yoshiro Tahara Michiaki Matsumoto
author_facet	Takaaki Tatsumi Yoshiro Tahara Michiaki Matsumoto
author_sort	Takaaki Tatsumi
title	Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
title_short	Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
title_full	Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
title_fullStr	Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
title_full_unstemmed	Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels
title_sort	adsorption of metallic ions on amidoxime-chitosan/cellulose hydrogels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0f281d882a064595a018747aeead9f1f
work_keys_str_mv	AT takaakitatsumi adsorptionofmetallicionsonamidoximechitosancellulosehydrogels AT yoshirotahara adsorptionofmetallicionsonamidoximechitosancellulosehydrogels AT michiakimatsumoto adsorptionofmetallicionsonamidoximechitosancellulosehydrogels
_version_	1718410446521761792

Adsorption of Metallic Ions on Amidoxime-Chitosan/Cellulose Hydrogels

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