Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels

Bibliographic Details
Main Author:	Mahaweero, Thanatdej
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 2013
Subjects:	Chemical Engineering
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1365160267

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case13651602672021-08-03T05:21:28Z Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels Mahaweero, Thanatdej Chemical Engineering Hydrogels based on chitosan, a biodegradable and abundant natural polymer, have received significant interest in various applications, including the removal of heavy metals from aqueous solutions. Novel chitosan (CTS)/ montmorillonite (MMT) hybrid hydrogels have been successfully developed by freeze-drying technique. The morphology of the hydrogels is observed to be porous and the existence of reactive ligands for chelation is confirmed, The stability of the hydrogels is improved by introducing polyvinyl alcohol (PVA) and increasing the cross-linking agent. Interestingly, the increment of MMT content also enhances the mechanical strength of the hydrogels. Adsorption study is performed with Cu(II) to evaluate the effects of pH and Cu(II) initial concentration. The maximum adsorption capacities at pH 3, 7 and 10 are 286, 282 and 179 mg/g, respectively, for the hybrid hydrogels with high content of chitosan. Langmuir isotherm provides the best fit for Cu(II) adsorption. Finally, the selectivity of CTS/MMT hybrid hydrogels toward various metal ions was determined. The order of selectivity is Cu(II)>Cr(III)˜Co(II)> Ni(II)>Zn(II). 2013-08-19 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1365160267 http://rave.ohiolink.edu/etdc/view?acc_num=case1365160267 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Chemical Engineering
spellingShingle	Chemical Engineering Mahaweero, Thanatdej Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
author	Mahaweero, Thanatdej
author_facet	Mahaweero, Thanatdej
author_sort	Mahaweero, Thanatdej
title	Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
title_short	Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
title_full	Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
title_fullStr	Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
title_full_unstemmed	Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels
title_sort	extraction of heavy metals from aqueous solutions using chitosan/montmorillonite hybrid hydrogels
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	2013
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1365160267
work_keys_str_mv	AT mahaweerothanatdej extractionofheavymetalsfromaqueoussolutionsusingchitosanmontmorillonitehybridhydrogels
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Extraction of Heavy Metals from Aqueous Solutions using Chitosan/Montmorillonite Hybrid Hydrogels

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