TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Do, Xuan Tung A1 - El Khaldi-Hansen, Basma A1 - Nietsch, Anke A1 - Jung, Christian A1 - Witzleben, Steffen A1 - Schulze, Margit T1 - Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis T2 - Preprints N2 - 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. KW - SEC KW - kraft lignin KW - ATR-FTIR KW - photolysis KW - actinometry KW - OH-number KW - UV-VIS KW - XRD KW - photocatalysis UN - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-33968 U6 - https://doi.org/10.20944/preprints201710.0128.v1 DO - https://doi.org/10.20944/preprints201710.0128.v1 SP - 10 S1 - 10 PB - MDPI CY - Basel ER -