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Fine tuning of CdxZn1-xS for photo-depolymerization of alkaline lignin into vanillin.
- Source :
-
International Journal of Biological Macromolecules . Aug2021, Vol. 185, p297-305. 9p. - Publication Year :
- 2021
-
Abstract
- Lignin is abundant and contains a large number of aromatic groups. Herein, Cd x Zn 1-x S photocatalyst with tunable band gap energy was successfully synthesized by using 3-mercaptopropionic acid as a structure tuning additive. Cd x Zn 1-x S can depolymerize alkaline lignin to vanillin by the photocatalytic process. Each gram of alkaline lignin can produce 46.5 mg of vanillin. 2-Phenoxy-1-phenylethanol (PP-ol) and other model compounds were used to understand the depolymerizing process of lignin. Fine tuned Cd x Zn 1-x S can effectively cleave the C β -O-4 bond existed in PP-ol under simulated sunlight. The highest conversion of PP-ol was 89.5% with phenol and acetophenone yields of 66.2% and 33.5%, respectively. The mechanism studies confirm that the C α -H in PP-ol and lignin is firstly dehydrogenated to form C α radical intermediates, and then the photogenerated electrons break the adjacent C β -O bond. This research provides a new strategy to prepare valuable chemicals by virtue of renewable biomass and simulated sunlight. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LIGNINS
*VANILLIN
*BAND gaps
*LIGNIN structure
*ENERGY bands
Subjects
Details
- Language :
- English
- ISSN :
- 01418130
- Volume :
- 185
- Database :
- Academic Search Index
- Journal :
- International Journal of Biological Macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 151684225
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2021.06.104