Study of the thermal decomposition of cellulose-hyphan and its complexes with some transition and indium metal ions
Identifieur interne : 000147 ( Main/Exploration ); précédent : 000146; suivant : 000148Study of the thermal decomposition of cellulose-hyphan and its complexes with some transition and indium metal ions
Auteurs : RBID : ISTEX:10973_1994_Article_BF02546924.pdfEnglish descriptors
Abstract
The studied complexes formed by the chelating ion exchanger were characterized by reflectance and infrared spectrometry. The thermal degradation of pure cellulose-hyphan (CH) and its complexes with Hg2+, In3+, Cr3+, Mo4+ and Mn2+ under an atmosphere of air has been studied using thermal gravimetry (TG) and differential thermal analysis (DTG). The results showed that four different stages are accompanying the decomposition of (CH) and its complexes with the studied metals. These stages were found to be affected by the presence of the investigated metal ions. On the bases of the applicability of a non-isothermal kinetic equation it was found to be a first-order reaction with the rate of degradation,k, ranging from 8.3·10−5 to 6.2·10−3 for (CH) and from 1.7·10−5 to 6.6·10−3 s−1 for its complexes. The activation energy,Ea, the entropy change, ΔS°, the enthalpy change, ΔH° and Gibbs free energy, ΔG° are calculated by applying the rate theory of the first-order reaction. The effect of the different central metal ions on the calculated thermodynamic parameters is discussed.
DOI: 10.1007/BF02546924
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<record><TEI><teiHeader><fileDesc><titleStmt><title>Study of the thermal decomposition of cellulose-hyphan and its complexes with some transition and indium metal ions</title><author><name>I. M. M. Kenawy</name><affiliation wicri:level="1"><mods:affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</mods:affiliation><country xml:lang="fr">Égypte</country><wicri:regionArea>Chemistry Department, Faculty of Science, Mansoura University, Mansoura</wicri:regionArea><wicri:noRegion>Mansoura</wicri:noRegion></affiliation></author><author><name>M. A. H. Hafez</name><affiliation wicri:level="1"><mods:affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</mods:affiliation><country xml:lang="fr">Égypte</country><wicri:regionArea>Chemistry Department, Faculty of Science, Mansoura University, Mansoura</wicri:regionArea><wicri:noRegion>Mansoura</wicri:noRegion></affiliation></author><author><name>Kh. S. El-Said</name><affiliation wicri:level="1"><mods:affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</mods:affiliation><country xml:lang="fr">Égypte</country><wicri:regionArea>Chemistry Department, Faculty of Science, Mansoura University, Mansoura</wicri:regionArea><wicri:noRegion>Mansoura</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="RBID">ISTEX:10973_1994_Article_BF02546924.pdf</idno><date when="1994">1994</date><idno type="doi">10.1007/BF02546924</idno><idno type="wicri:Area/Main/Corpus">000B11</idno><idno type="wicri:Area/Main/Curation">000B11</idno><idno type="wicri:Area/Main/Exploration">000147</idno></publicationStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cellulose-hyphan polymer</term><term>Indium and transition metal complexes</term><term>Thermal analysis</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="eng">The studied complexes formed by the chelating ion exchanger were characterized by reflectance and infrared spectrometry. The thermal degradation of pure cellulose-hyphan (CH) and its complexes with Hg2+, In3+, Cr3+, Mo4+ and Mn2+ under an atmosphere of air has been studied using thermal gravimetry (TG) and differential thermal analysis (DTG). The results showed that four different stages are accompanying the decomposition of (CH) and its complexes with the studied metals. These stages were found to be affected by the presence of the investigated metal ions. On the bases of the applicability of a non-isothermal kinetic equation it was found to be a first-order reaction with the rate of degradation,k, ranging from 8.3·10−5 to 6.2·10−3 for (CH) and from 1.7·10−5 to 6.6·10−3 s−1 for its complexes. The activation energy,Ea, the entropy change, ΔS°, the enthalpy change, ΔH° and Gibbs free energy, ΔG° are calculated by applying the rate theory of the first-order reaction. The effect of the different central metal ions on the calculated thermodynamic parameters is discussed.</div></front></TEI><mods xsi:schemaLocation="http://www.loc.gov/mods/v3 file:///applis/istex/home/loadistex/home/etc/xsd/mods.xsd" version="3.4" istexId="c250bb1f8c4346d40551ba7127f7420e2ef14931"><titleInfo lang="eng"><title>Study of the thermal decomposition of cellulose-hyphan and its complexes with some transition and indium metal ions</title></titleInfo><name type="personal"><namePart type="given">I. M. M.</namePart><namePart type="family">Kenawy</namePart><role><roleTerm type="text">author</roleTerm></role><affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</affiliation></name><name type="personal"><namePart type="given">M. A. H.</namePart><namePart type="family">Hafez</namePart><role><roleTerm type="text">author</roleTerm></role><affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</affiliation></name><name type="personal"><namePart type="given">Kh. S.</namePart><namePart type="family">El-Said</namePart><role><roleTerm type="text">author</roleTerm></role><affiliation>Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt</affiliation></name><typeOfResource>text</typeOfResource><genre>Original Paper</genre><originInfo><publisher>Kluwer Academic Publishers, Dordrecht</publisher><dateCreated encoding="w3cdtf">1993-09-29</dateCreated><dateValid encoding="w3cdtf">2006-12-20</dateValid><copyrightDate encoding="w3cdtf">1994</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="eng">The studied complexes formed by the chelating ion exchanger were characterized by reflectance and infrared spectrometry. The thermal degradation of pure cellulose-hyphan (CH) and its complexes with Hg2+, In3+, Cr3+, Mo4+ and Mn2+ under an atmosphere of air has been studied using thermal gravimetry (TG) and differential thermal analysis (DTG). The results showed that four different stages are accompanying the decomposition of (CH) and its complexes with the studied metals. These stages were found to be affected by the presence of the investigated metal ions. On the bases of the applicability of a non-isothermal kinetic equation it was found to be a first-order reaction with the rate of degradation,k, ranging from 8.3·10−5 to 6.2·10−3 for (CH) and from 1.7·10−5 to 6.6·10−3 s−1 for its complexes. The activation energy,Ea, the entropy change, ΔS°, the enthalpy change, ΔH° and Gibbs free energy, ΔG° are calculated by applying the rate theory of the first-order reaction. The effect of the different central metal ions on the calculated thermodynamic parameters is discussed.</abstract><abstract lang="ger">Die durch einen chelatbildenden Ionenaustauscher gebildeten untersuchten Komplexe wurden mittels Reflexionsmessung und IR-Spektroskopie charakterisiert. Mittels TG und DTG wurde in Luft der thermische Abbau reinem Zellulose-Hyphan (CH) und seiner Komplexe mit Hg2+, In3+, Cr3+, Mo4+ und Mn2+ untersucht. Die Ergebnisse zeigen, daß die Zersetzung von (CH) und seiner Komplexe mit den untersuchten Metallen von vier verschiedenen Stufen begleitet wird. Diese Stufen werden von der Gegenwart der untersuchten Metallionen beeinflußt. Ausgehend von der Anwendbarkeit einer nichtisothermen kinetischen Gleichung wurde eine Zersetzungsreaktion erster Ordnung mit einer Geschwindigkeitskonstante zwischen 8,310−5 und 6,210−3 für (CH) und zwischen 1,710−5 und 6,610−3 für seine Komplexe gefunden. Die AktivierungsenergieEa, die Entropieänderung ΔSo, die Enthalpieänderung ΔHo, die freie Energie ΔGo wurden durch Anwendung der Geschwindigkeitstheorie auf die Reaktion erster Ordnung berechnet. Der Einfluß der verschiedenen zentralen Metallionen auf die berechneten thermodynamischen Größen wurde diskutiert.</abstract><subject lang="eng"><genre>Keywords</genre><topic>cellulose-hyphan polymer</topic><topic>indium and transition metal complexes</topic><topic>thermal analysis</topic></subject><relatedItem type="series"><titleInfo type="abbreviated"><title>Journal of Thermal Analysis</title></titleInfo><titleInfo><title>Journal of thermal analysis</title><partNumber>Year: 1994</partNumber><partNumber>Volume: 42</partNumber><partNumber>Number: 6</partNumber></titleInfo><genre>Archive Journal</genre><originInfo><dateIssued encoding="w3cdtf">1994-12-01</dateIssued><copyrightDate encoding="w3cdtf">1994</copyrightDate></originInfo><subject usage="primary"><topic>Chemistry</topic><topic>Inorganic Chemistry</topic><topic>Physical Chemistry</topic><topic>Polymer Sciences</topic><topic>Measurement Science, Instrumentation</topic></subject><identifier type="issn">0022-5215</identifier><identifier type="issn">Electronic: 1572-8943</identifier><identifier type="matrixNumber">10973</identifier><identifier type="local">IssueArticleCount: 27</identifier><recordInfo><recordOrigin>Wiley Heyden Ltd and Akadémiai Kiadó, 1994</recordOrigin></recordInfo></relatedItem><identifier type="doi">10.1007/BF02546924</identifier><identifier type="matrixNumber">Art10</identifier><identifier type="local">BF02546924</identifier><accessCondition type="use and reproduction">MetadataGrant: OpenAccess</accessCondition><accessCondition type="use and reproduction">AbstractGrant: OpenAccess</accessCondition><accessCondition type="restriction on access">BodyPDFGrant: Restricted</accessCondition><accessCondition type="restriction on access">BodyHTMLGrant: Restricted</accessCondition><accessCondition type="restriction on access">BibliographyGrant: Restricted</accessCondition><accessCondition type="restriction on access">ESMGrant: Restricted</accessCondition><part><extent unit="pages"><start>1143</start><end>1154</end></extent></part><recordInfo><recordOrigin>Akadémiai Kiadó, 1994</recordOrigin><recordIdentifier>10973_1994_Article_BF02546924.pdf</recordIdentifier></recordInfo></mods></record>Pour manipuler ce document sous Unix (Dilib)
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