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Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis

  • Today, more than 70 million tons of lignin are produced by the pulp and paper industry every year. However, the utilization of lignin as a source for chemical synthesis is still limited due to the complex and heterogeneous lignin structure. The purpose of this study was a selective photodegradation of industrially available kraft lignin in order to obtain appropriate fragments and building block chemicals for further utilization, e.g. polymerization. Thus, kraft lignin obtained from soft wood black liquor by acidification was dissolved in sodium hydroxide and irradiated at a wavelength of 254 nm with and without the presence of titanium dioxide in various concentrations. Analyses of the irradiated products via SEC showed decreasing molar masses and decreasing polydispersity indices over time. At the end of the irradiation period the lignin was depolymerised to form fragments as small as the lignin monomers. TOC analyses showed minimal mineralisation due to the depolymerisation process.

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Document Type:Preprint
Author:Xuan Tung Do, Basma El Khaldi-Hansen, Anke Nietsch, Christian Jung, Steffen Witzleben, Margit Schulze
Parent Title (English):Preprints
Place of publication:Basel
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2017/10/18
© 2017 by the author(s). Distributed under a Creative Commons CC BY license.
Keyword:ATR-FTIR; OH-number; SEC; UV-VIS; XRD; actinometry; kraft lignin; photocatalysis; photolysis
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 54 Chemie / 547 Organische Chemie
Entry in this database:2017/11/15
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International