Utilization of waste PAN fibers as adsorbents by chemical and thermal modification

Simitzis, J; Terlemesian, E; Mladenov, I

dc.contributor.author	Simitzis, J	en
dc.contributor.author	Terlemesian, E	en
dc.contributor.author	Mladenov, I	en
dc.date.accessioned	2014-03-01T01:11:34Z
dc.date.available	2014-03-01T01:11:34Z
dc.date.issued	1995	en
dc.identifier.issn	0014-3057	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11715
dc.subject	Aqueous Solution	en
dc.subject	Chemical Treatment	en
dc.subject	Industrial Waste	en
dc.subject	Ir Spectroscopy	en
dc.subject	Methylene Blue	en
dc.subject	Nitrogen	en
dc.subject	Structural Change	en
dc.subject	Sulfuric Acid	en
dc.subject	thermogravimetric analysis	en
dc.subject	High Concentrate	en
dc.subject	Weight Loss	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Crosslinking	en
dc.subject.other	Heat treatment	en
dc.subject.other	Pyrolysis	en
dc.subject.other	Synthetic fibers	en
dc.subject.other	Chemical treatment	en
dc.subject.other	Diamine	en
dc.subject.other	Experimental study	en
dc.subject.other	Liquid solid adsorption	en
dc.subject.other	Organic dye	en
dc.subject.other	Scrap polymer	en
dc.subject.other	Structure effect	en
dc.subject.other	Polyacrylonitriles	en
dc.title	Utilization of waste PAN fibers as adsorbents by chemical and thermal modification	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0014-3057(95)00087-9	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0014-3057(95)00087-9	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	Polyacrylonitrile (PAN) polymers obtained from industrial waste fibers (i.e. ''Bulana'') were modified with ethylene diamine (EDA) at low and high concentration. The structural changes after the chemical treatment were determined by IR-spectroscopy following dissolution in concentrated sulfuric acid. The cross-linking formation as well as the formation of various groups (such as amine, imine, amide, carbonyl) were observed. The unmodified and EDA-modified polymers were pyrolyzed in a nitrogen stream at temperatures up to 600 degrees C. The weight losses measured by weighing the sample before and after pyrolysis and thermogravimetric analysis revealed three regions (up to 300 and 500 degrees C having very high weight losses and above 500 degrees C having lower weight losses), while associated changes of the various groups of the polymers were determined by IR-spectroscopy, The adsorption (discoloring) ability of the polymers was examined by using aqueous solution of methylene blue or alizarin yellow. The experimental results were correlated with those of model polymers based on polyacrylonitrile, having known structure, and interpreted on the basis of electron donor-acceptor (EDA) interaction concept between the main groups of the polymers and the dyes. The adsorption ability of the pyrolyzed polymers up to 300 degrees C (especially for the unmodified and low amine modified forms) for both dyes were improved in comparison with the corresponding unmodified polymer. The pyrolyzed polymers treated above 400 degrees C showed no discoloring ability because of the absence of nitrile groups (completely lost through cyclization reactions) and other groups.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	European Polymer Journal	en
dc.identifier.doi	10.1016/0014-3057(95)00087-9	en
dc.identifier.isi	ISI:A1995TJ14300016	en
dc.identifier.volume	31	en
dc.identifier.issue	12	en
dc.identifier.spage	1261	en
dc.identifier.epage	1267	en