Lignocellulosic biomass composed of lignin cellulose and hemicellulose, which are represent more than 90% of plant biomass. Lignin is abundant renewable resources including coumaroyl alcohol, coniferyl alcohol and sinapyl alcohol in nature. Here, our study focuses on the one pot process for production of two step-oxidation and cleavage of C-O bond of β-O-4 linkage in lignin model compounds. A polypyridine ruthenium complex coated onto TiO2 nanoparticles (TiO2-RuC) was fabricated as the photocatalyst for photocatalytic cleavage of 2-phenoxy-1-phenylethanol (PP-ol) as the lignin model compound. In addition, controlling the morphology of TiO2 nanoparticles are critical to enhance the photocatalytic conversion efficiency of PP-ol to PP-one and acetophenone and phenol. The PP-ol successfully demonstrated the hydrogen atom transfer (HAT) mediated oxidation of Cα-O of β-O-4 alcohols by abstraction of benzylic hydrogen followed by the C-O bond cleavage under the sunlight illumination. The photophysical and electrochemical properties of a TiO2-RuC are carried out to understand mechanistic pathways of electron/hole transfer at the interface of RuC-TiO2 and HAT.

Ruthenium(II) polypyridine complex coated TiO2 nanoparticles for lignin depolymerization

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.