| 초록 |
Since the first mass production of plastics in 1950s, plastic wastes induce global environmental problem with only 18% of recycle rate due to the high energy barrier on carbon covalent bond cleavage. Ideally, the recycle process requires a selective cleavage for further application; however, a conventional process utilizes harsh environment which led to random cleavage. To address this, it is required to do a fundamental study on bond cleavage with a simplified target model and use environmentally-benign photoredox catalysis. Herein, we demonstrate a selective C-C bond cleavage of ß-O-4 lignin model with high selectivity (89.6 %) and enhanced conversion (91.6 %) using Giant Keplerate polyoxometalate photocatalyst with various redox potentials. Also, the correlation between a redox potential of photocatalysts and a charge transfer reaction involved in the bond cleavage is studied. It is expected that this model system can be further applied for common types of plastic waste treatments. |
