Date of Award
Level of Access Assigned by Author
Master of Science (MS)
Peter Van Walsum
Second Committee Member
Third Committee Member
M. Clayton Wheeler
In this investigation we propose a novel method to enable precipitation of desired solutes using photo-isomers in the extraction solvent. This photo-switchable solvent would enable dissolution or precipitation of desired components using alternating UV or visible light to modify the solubility of the compounds of interest. Three photo-isomers namely native azobenzene, diethoxy azobenzene and diethylamino azobenzene were studied in three different organic solvents: medium chain length alcohol, ethanol and acetone. It was found that among the different combinations of solvent and photo-isomer, acetone and the 4,4’-diethoxy azobenzene solution was most efficient at precipitating dissolved lignin in response to UV light exposure. This system was able to precipitate 20% of the initial amount of lignin added.
Karki, Dipesh J., "Use of Photo Isomers to Enhance the Removal of Lignin From Woody Biomass Hydrolysate" (2023). Electronic Theses and Dissertations. 3825.