Abstract
Lignin is a type of polymer with diverse functional groups that can be transformed into biofuels and various high-value chemicals. By utilizing light energy and operating at low temperatures, photocatalysis via Reactive Oxygen Species (ROS) becomes a promising strategy to develop further. However, the revelation of photocatalyst mechanisms in ROS production to improve the efficiency and effectiveness of lignin transformation is still limited. This study aims to determine the effect of Cu2O/CuO quantum dots (QDs) concentration in the photocatalyst system on lignin depolymerization via ROS. The wet chemical method was used to synthesize Cu2O/CuO QDs. The property determination of absorbance, crystallinity, and particle morphology is characterized using uv-vis, X-ray diffraction (XRD), and Transmission Electron Microscope (TEM) instrument. The ROS production was measured using a UV-vis instrument by varying the Cu2O/CuO QDs concentration (1, 3, and 5 μM). The depolymerization sign was observed using a Fourier-Transform Infrared Spectroscopy (FTIR) instrument. The result shows that the synthesized material has a Cu2O/CuO phase with an average particle size of 8 nm and a band gap value of 2.35 eV. The optimum ROS production activity was achieved at the Cu2O/CuO QDs 3 μM concentration, reaching ten mM/sec. The FTIR result also confirms that the functional group transformation occurred. Overall, this study provides brief insight for further optimization of the lignin depolymerization photocatalysis process.
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