Determination of surface-accessible acidic hydroxyls and surface area of lignin by cationic dye adsorption

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorSipponen, Mika Henrikki
dc.contributor.authorPihlajaniemi, Ville
dc.contributor.authorLittunen, Kuisma
dc.contributor.authorPastinen, Ossi
dc.contributor.authorLaakso, Simo
dc.contributor.departmentDepartment of Biotechnology and Chemical Technologyen
dc.contributor.departmentBiotekniikan ja kemian tekniikan laitosfi
dc.contributor.labApplied Biochemistry Research Groupen
dc.contributor.labBiokemian tutkimusryhmäfi
dc.contributor.schoolKemian tekniikan korkeakoulufi
dc.contributor.schoolSchool of Chemical Technologyen
dc.date.accessioned2014-08-21T08:32:07Z
dc.date.available2014-08-21T08:32:07Z
dc.date.issued2014
dc.description.abstractA new colorimetric method for determining the surface-accessible acidic lignin hydroxyl groups in lignocellulose solid fractions was developed. The method is based on selective adsorption of Azure B, a basic dye, onto acidic hydroxyl groups of lignin. Selectivity of adsorption of Azure B on lignin was demonstrated using lignin and cellulose materials as adsorbents. Adsorption isotherms of Azure B on wheat straw (WS), sugarcane bagasse (SGB), oat husk, and isolated lignin materials were determined. The maximum adsorption capacities predicted by the Langmuir isotherms were used to calculate the amounts of surface-accessible acidic hydroxyl groups. WS contained 1.7-times more acidic hydroxyls (0.21 mmol/g) and higher surface area of lignin (84 m2/g) than SGB or oat husk materials. Equations for determining the amount of surface-accessible acidic hydroxyls in solid fractions of the three plant materials by a single point measurement were developed. A method for high-throughput characterization of lignocellulosic materials is now available.en
dc.format.extent80-87
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSipponen, Mika Henrikki & Pihlajaniemi, Ville & Littunen, Kuisma & Pastinen, Ossi & Laakso, Simo. 2014. Determination of surface-accessible acidic hydroxyls and surface area of lignin by cationic dye adsorption. Bioresource Technology. Volume 169. P. 80-87. ISSN 0960-8524 (printed). DOI: 10.1016/j.biortech.2014.06.073.en
dc.identifier.doi10.1016/j.biortech.2014.06.073
dc.identifier.issn0960-8524 (printed)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/13824
dc.identifier.urnURN:NBN:fi:aalto-201408212475
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.ispartofseriesBioresource Technologyen
dc.relation.ispartofseriesVolume 169
dc.rights.holderElsevier BV
dc.subject.keywordAdsorptionen
dc.subject.keywordcationicen
dc.subject.keyworddyeen
dc.subject.keywordligninen
dc.subject.keywordsurface-accessibleen
dc.subject.keywordsurfaceen
dc.subject.keywordareaen
dc.subject.otherChemistryen
dc.titleDetermination of surface-accessible acidic hydroxyls and surface area of lignin by cationic dye adsorptionen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.dcmitypetexten
dc.type.versionPre-printen
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