Version 1
: Received: 18 October 2017 / Approved: 18 October 2017 / Online: 18 October 2017 (08:55:29 CEST)
How to cite:
Do, X.T.; El Khaldi-Hansen, B.; Nietsch, A.; Jung, C.; Witzleben, S.; Schulze, M. Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis. Preprints2017, 2017100128. https://doi.org/10.20944/preprints201710.0128.v1
Do, X.T.; El Khaldi-Hansen, B.; Nietsch, A.; Jung, C.; Witzleben, S.; Schulze, M. Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis. Preprints 2017, 2017100128. https://doi.org/10.20944/preprints201710.0128.v1
Do, X.T.; El Khaldi-Hansen, B.; Nietsch, A.; Jung, C.; Witzleben, S.; Schulze, M. Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis. Preprints2017, 2017100128. https://doi.org/10.20944/preprints201710.0128.v1
APA Style
Do, X.T., El Khaldi-Hansen, B., Nietsch, A., Jung, C., Witzleben, S., & Schulze, M. (2017). Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis. Preprints. https://doi.org/10.20944/preprints201710.0128.v1
Chicago/Turabian Style
Do, X.T., Steffen Witzleben and Margit Schulze. 2017 "Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis" Preprints. https://doi.org/10.20944/preprints201710.0128.v1
Abstract
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.
Chemistry and Materials Science, Organic Chemistry
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
