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

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Sipponen, Mika Henrikki
dc.contributor.author Pihlajaniemi, Ville
dc.contributor.author Littunen, Kuisma
dc.contributor.author Pastinen, Ossi
dc.contributor.author Laakso, Simo
dc.date.accessioned 2014-08-21T08:32:07Z
dc.date.available 2014-08-21T08:32:07Z
dc.date.issued 2014
dc.identifier.citation Sipponen, 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.issn 0960-8524 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/13824
dc.description.abstract A 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.extent 80-87
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier BV en
dc.relation.ispartofseries Bioresource Technology en
dc.relation.ispartofseries Volume 169
dc.subject.other Chemistry en
dc.title Determination of surface-accessible acidic hydroxyls and surface area of lignin by cationic dye adsorption en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.rights.holder Elsevier BV
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Department of Biotechnology and Chemical Technology en
dc.contributor.department Biotekniikan ja kemian tekniikan laitos fi
dc.subject.keyword Adsorption en
dc.subject.keyword cationic en
dc.subject.keyword dye en
dc.subject.keyword lignin en
dc.subject.keyword surface-accessible en
dc.subject.keyword surface en
dc.subject.keyword area en
dc.identifier.urn URN:NBN:fi:aalto-201408212475
dc.type.dcmitype text en
dc.identifier.doi 10.1016/j.biortech.2014.06.073
dc.contributor.lab Applied Biochemistry Research Group en
dc.contributor.lab Biokemian tutkimusryhmä fi
dc.type.version Pre-print en


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