Citation: Yadan Luo, Hao Zheng, Xin Li, Fengmin Li, Hua Tang, Xilin She. Modulating reactive oxygen species in O, S co-doped C₃N₄ to enhance photocatalytic degradation of microplastics[J]. Acta Physico-Chimica Sinica, ;2025, 41(6): 100052. doi: 10.1016/j.actphy.2025.100052 shu

Modulating reactive oxygen species in O, S co-doped C₃N₄ to enhance photocatalytic degradation of microplastics

Yadan Luo ¹ ,
Hao Zheng ^1,2 ,
Xin Li ³ ,
Fengmin Li ^1,2 ,
Hua Tang ⁴ ,
Xilin She ⁴

1.
Institute of Coastal Environmental Pollution Control, Ministry of Education Key Laboratory of Marine Environment and Ecology, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, Shandong Province, China;
2.
Sanya Oceanographic Institute, Ocean University of China, Sanya 572000, Hainan Province, China;
3.
Institute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China;
4.
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, Shandong Province, China

Received Date: 16 December 2024
Revised Date: 11 January 2025
Accepted Date: 13 January 2025

Fund Project: The project was supported by the Hainan Provincial Natural Science Foundation of China (423CXTD384), the National Natural Science Foundation of China (42077115), the National Science Fund for Distinguished Young Scholars of Shandong Province (ZR2021JQ13).

Photocatalytic microplastic (MP) degradation via reactive oxygen species (ROS) is a considered environmentally friendly and sustainable approach for eliminating MP pollution in aquatic environments. However, it faces challenges due to the low migration and rapid recombination efficiency of charge carriers in photocatalysts. Herein, oxygen and sulfur co-doped carbon nitride (OSCN) nanosheets were synthesized through thermal polymerization coupled with a thermosolvent process. The O and S co-doping can reduce the bandgap and improve the light response of carbon nitride (C₃N₄). Meanwhile, O/S dopants effectively improve the delocalization of electron distribution, leading to increased carrier separation capacity, thereby promoting the formation of ROS and enhancing photocatalytic performance. Compared to C₃N₄, OSCN demonstrated significantly higher photocatalytic degradation and mineralization rates for MPs, including polyethylene (PE, traditional petroleum-based MPs) and polylactic acid (PLA, biodegradable bio-based MPs). Specifically, the mass loss of PE and PLA increased by 32.8% and 34.1%, respectively. Notably, ^·OH and ¹O₂ generated by OSCN synergistically catalyzed the degradation of PE, while ^·OH was the primary radical triggering the photolysis and hydrolysis of PLA. This study holds significant implications for the application of photocatalysis technology in the remediation of MP pollution in aquatic environments.
- Microplastics,
- Photocatalysis,
- Co-doped,
- C₃N₄,
- Degradation mechanism
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Modulating reactive oxygen species in O, S co-doped C₃N₄ to enhance photocatalytic degradation of microplastics