Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked O-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics

The chemical cross-linking of carboxymethyl chitosan (O-CM-chitosan), as a method for its modification, was performed using trimellitic anhydride isothiocyanate to obtain novel cross-linked O-CM-chitosan hydrogel. Its structure was proven using FTIR, XRD and SEM...

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Auteurs principaux:	Nouf Faisal Alharby, Ruwayda S. Almutairi, Nadia A. Mohamed
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	carboxymethyl chitosan hydrogel MB dye adsorption kinetics adsorption isotherms adsorption thermodynamic Organic chemistry QD241-441
Accès en ligne:	https://doaj.org/article/c2acfce4c7af428da3adb9943ec03f46
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spelling	oai:doaj.org-article:c2acfce4c7af428da3adb9943ec03f462021-11-11T18:42:57ZAdsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics10.3390/polym132136592073-4360https://doaj.org/article/c2acfce4c7af428da3adb9943ec03f462021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3659https://doaj.org/toc/2073-4360The chemical cross-linking of carboxymethyl chitosan (<i>O</i>-CM-chitosan), as a method for its modification, was performed using trimellitic anhydride isothiocyanate to obtain novel cross-linked <i>O</i>-CM-chitosan hydrogel. Its structure was proven using FTIR, XRD and SEM. Its adsorption capacity for the removal of Methylene Blue (MB) dye from aqueous solution was studied. The effects of different factors on the adsorption process, such as the pH, temperature and concentration of the dye, in addition to applications of the kinetic studies of the adsorption process, adsorption isotherm and thermodynamic parameters, were studied. It was found that the amount of adsorbed MB dye increases with increasing temperature. A significant increase was obtained in the adsorption capacities and removal percentage of MB dye with increasing pH values. An increase in the initial dye concentration increases the adsorption capacities, and decreases the removal percentage. It was found that the pseudo-second-order mechanism is predominant, and the overall rate of the dye adsorption process appears to be controlled by more than one step. The Langmuir model showed high applicability for the adsorption of MB dye onto <i>O</i>-CM-chitosan hydrogel. The value of the activation energy (<i>E<sub>a</sub></i>) is 27.15 kJ mol<sup>−1</sup> and the thermodynamic parameters were evaluated. The regeneration and reuse of the investigated adsorbent was investigated.Nouf Faisal AlharbyRuwayda S. AlmutairiNadia A. MohamedMDPI AGarticlecarboxymethyl chitosan hydrogelMB dyeadsorption kineticsadsorption isothermsadsorption thermodynamicOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3659, p 3659 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	carboxymethyl chitosan hydrogel MB dye adsorption kinetics adsorption isotherms adsorption thermodynamic Organic chemistry QD241-441
spellingShingle	carboxymethyl chitosan hydrogel MB dye adsorption kinetics adsorption isotherms adsorption thermodynamic Organic chemistry QD241-441 Nouf Faisal Alharby Ruwayda S. Almutairi Nadia A. Mohamed Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
description	The chemical cross-linking of carboxymethyl chitosan (<i>O</i>-CM-chitosan), as a method for its modification, was performed using trimellitic anhydride isothiocyanate to obtain novel cross-linked <i>O</i>-CM-chitosan hydrogel. Its structure was proven using FTIR, XRD and SEM. Its adsorption capacity for the removal of Methylene Blue (MB) dye from aqueous solution was studied. The effects of different factors on the adsorption process, such as the pH, temperature and concentration of the dye, in addition to applications of the kinetic studies of the adsorption process, adsorption isotherm and thermodynamic parameters, were studied. It was found that the amount of adsorbed MB dye increases with increasing temperature. A significant increase was obtained in the adsorption capacities and removal percentage of MB dye with increasing pH values. An increase in the initial dye concentration increases the adsorption capacities, and decreases the removal percentage. It was found that the pseudo-second-order mechanism is predominant, and the overall rate of the dye adsorption process appears to be controlled by more than one step. The Langmuir model showed high applicability for the adsorption of MB dye onto <i>O</i>-CM-chitosan hydrogel. The value of the activation energy (<i>E<sub>a</sub></i>) is 27.15 kJ mol<sup>−1</sup> and the thermodynamic parameters were evaluated. The regeneration and reuse of the investigated adsorbent was investigated.
format	article
author	Nouf Faisal Alharby Ruwayda S. Almutairi Nadia A. Mohamed
author_facet	Nouf Faisal Alharby Ruwayda S. Almutairi Nadia A. Mohamed
author_sort	Nouf Faisal Alharby
title	Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
title_short	Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
title_full	Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
title_fullStr	Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
title_full_unstemmed	Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics
title_sort	adsorption behavior of methylene blue dye by novel crosslinked <i>o</i>-cm-chitosan hydrogel in aqueous solution: kinetics, isotherm and thermodynamics
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c2acfce4c7af428da3adb9943ec03f46
work_keys_str_mv	AT nouffaisalalharby adsorptionbehaviorofmethylenebluedyebynovelcrosslinkedioicmchitosanhydrogelinaqueoussolutionkineticsisothermandthermodynamics AT ruwaydasalmutairi adsorptionbehaviorofmethylenebluedyebynovelcrosslinkedioicmchitosanhydrogelinaqueoussolutionkineticsisothermandthermodynamics AT nadiaamohamed adsorptionbehaviorofmethylenebluedyebynovelcrosslinkedioicmchitosanhydrogelinaqueoussolutionkineticsisothermandthermodynamics
_version_	1718431786147512320

Adsorption Behavior of Methylene Blue Dye by Novel CrossLinked <i>O</i>-CM-Chitosan Hydrogel in Aqueous Solution: Kinetics, Isotherm and Thermodynamics

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