Diffusion-limited sorption of dyes on modified acrylics and acrylic copolymers

Simitzis, J

dc.contributor.author	Simitzis, J	en
dc.date.accessioned	2014-03-01T01:10:55Z
dc.date.available	2014-03-01T01:10:55Z
dc.date.issued	1995	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11498
dc.subject	acrylic copolymers	en
dc.subject	modified acrylics	en
dc.subject	sorption	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Adsorption	en
dc.subject.other	Chemical modification	en
dc.subject.other	Copolymerization	en
dc.subject.other	Copolymers	en
dc.subject.other	Diffusion	en
dc.subject.other	Dyes	en
dc.subject.other	Polyacrylonitriles	en
dc.subject.other	Porosity	en
dc.subject.other	Sulfuric acid	en
dc.subject.other	Acrylonitrile	en
dc.subject.other	Fick's equation	en
dc.subject.other	Methylene blue	en
dc.subject.other	Pore structure	en
dc.subject.other	Redox system	en
dc.subject.other	Sodium hydroxide	en
dc.subject.other	Acrylics	en
dc.subject.other	acrylic fibres	en
dc.subject.other	acrylonitrile copolymers	en
dc.subject.other	sorption of dyes	en
dc.title	Diffusion-limited sorption of dyes on modified acrylics and acrylic copolymers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0032-3861(95)93602-I	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0032-3861(95)93602-I	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	Acrylonitrile was polymerized using a redox system. The polyacrylonitrile was modified by heating with aqueous 50% H2SO4 or with aqueous 50% NaOH. Acrylonitrile was also copolymerized with acrylic acid or acrylamide or methylenebisacrylamide using a redox system. The sorption abilities of the modified acrylics and copolymers were determined from aqueous solutions of two dyes, namely methylene blue and alizarin yellow R. The porous structure of the polymers was determined by using mercury porosimetry. The experimental results of the dye uptake were theoretically treated by using a diffusion-limited adsorption method. The equation was applied for short reaction times and the parameters were graphically determined from log-log plots: the specific rate constant k′ from the intercept A and the parameter n (0 < n < 1) from the slope. The diffusion coefficient D was calculated from Fick's equation. The results were discussed taking into consideration the pore structure of the polymers as well as the 'pore model' and the 'free volume model' of the diffusion process. The electron donor-acceptor interactions between the functional groups of the polymers and the functional groups of the dyes strongly influence the sorption process. © 1995.	en
heal.publisher	BUTTERWORTH-HEINEMANN LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/0032-3861(95)93602-I	en
dc.identifier.isi	ISI:A1995QM36400017	en
dc.identifier.volume	36	en
dc.identifier.issue	5	en
dc.identifier.spage	1017	en
dc.identifier.epage	1021	en