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Lignin from sugar cane bagasse: Extraction, fabrication of nanostructured films, and application

dc.contributor.authorPereira, A. A.
dc.contributor.authorMartins, G. F.
dc.contributor.authorAntunes, P. A.
dc.contributor.authorConrrado, R.
dc.contributor.authorPasquini, D.
dc.contributor.authorJob, A. E.
dc.contributor.authorCurvelo, A. A. S.
dc.contributor.authorFerreira, M.
dc.contributor.authorRiul, A.
dc.contributor.authorConstantino, C. J. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade do Oeste Paulista (UNOESTE)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2014-05-20T15:22:54Z
dc.date.available2014-05-20T15:22:54Z
dc.date.issued2007-06-05
dc.description.abstractFour lignin samples were extracted from sugar cane bagasse using four different alcohols (methanol, ethanol, n-propanol, and 1-butanol) via the organosolv-CO2 supercritical pulping process. Langmuir films were characterized by surface pressure vs mean molecular area (Pi-A) isotherms to exploit information at the molecular level carrying out stability tests, cycles of compression/expansion (hysteresis), subphase temperature variations, and metallic ions dissolved into the water subphase at different concentrations. Briefly, it was observed that these lignins are relatively stable on the water surface when compared to those obtained via different extraction processes. Besides, the Pi-A isotherms are shifted to smaller molecular areas at higher subphase temperatures and to larger molecular areas when the metallic ions are dissolved into the subphase. The results are related to the formation of stable aggregates (domains) onto the water subphase by these lignins, as shown in the Pi-A isotherms. It was found as well that the most stable lignin monolayer onto the water subphase is that extracted with 1-butanol. Homogeneous Langmuir-Blodgett (LB) films of this lignin could be produced as confirmed by UV-vis absorption spectroscopy and the cumulative transfer parameter. In addition, FTIR analysis showed that this lignin LB film is structured in a way that the phenyl groups are organized preferentially parallel to the substrate surface. Further, these LB films were deposited onto gold interdigitated electrodes and ITO and applied in studies involving the detection of Cd+2 ions in aqueous solutions at low concentration levels throughimpedance spectroscopy and electrochemical measurements. FTIR spectroscopy was carried out before and after soaking the thin films into Cd+2 aqueous solutions, revealing a possible physical interaction between the lignin phenyl groups and the heavy metal ions. The importance of using nanostructured systems is demonstrated as well by comparing both LB and cast films.en
dc.description.affiliationUNESP, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUniv Oeste Paulista, Fac Ciências, BR-19050900 Presidente Prudente, SP, Brazil
dc.description.affiliationUSP, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, BR-18043970 Sao Carlos, SP, Brazil
dc.description.affiliationUnespUNESP, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent6652-6659
dc.identifierhttp://dx.doi.org/10.1021/la063582s
dc.identifier.citationLangmuir. Washington: Amer Chemical Soc, v. 23, n. 12, p. 6652-6659, 2007.
dc.identifier.doi10.1021/la063582s
dc.identifier.issn0743-7463
dc.identifier.lattes6475585105456744
dc.identifier.urihttp://hdl.handle.net/11449/33796
dc.identifier.wosWOS:000246776600027
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofLangmuir
dc.relation.ispartofjcr3.789
dc.relation.ispartofsjr1,479
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleLignin from sugar cane bagasse: Extraction, fabrication of nanostructured films, and applicationen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/paragonplus/copyright/jpa_form_a.pdf
dcterms.rightsHolderAmer Chemical Soc
unesp.author.lattes6475585105456744[6]
unesp.author.lattes6118325967319836[10]
unesp.author.orcid0000-0002-9459-8167[8]
unesp.author.orcid0000-0002-9760-1851[9]
unesp.author.orcid0000-0002-1979-8257[6]
unesp.author.orcid0000-0002-5921-3161[10]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept
unesp.departmentFísica, Química e Biologia - FCTpt

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