Synergistic modulation of phase and doping in Co-N-MoS₂ heterojunctions for pathway-modulated ROS evolution in PMS...

Area of Science:

• Materials Science
• Catalysis
• Environmental Chemistry

Background:

• Controlled generation of reactive oxygen species (ROS) is crucial for peroxymonosulfate (PMS) activation.
• Developing catalysts that modulate ROS pathways remains a significant challenge in environmental remediation.

Purpose of the Study:

• To investigate the impact of doping and phase engineering on ROS evolution during PMS activation.
• To design a catalyst for controlled pathway modulation of ROS generation.

Main Methods:

• Synthesis of a CoN co-doped MoS2 catalyst with a 1T/2H heterophase (N-Co-MoS2).
• Characterization using advanced techniques to analyze catalyst structure and electronic properties.
• Evaluation of ROS distribution and pollutant degradation efficiency during PMS activation.

Main Results:

• The N-Co-MoS2 catalyst stabilized the metallic 1T phase and enriched graphitic nitrogen, creating electron-rich Co-Nₓ sites.
• Phase and doping modulation steered ROS distribution, achieving a balanced composition of ¹O₂, O₂•⁻, •OH, and SO₄•⁻.
• The catalyst demonstrated effective pollutant detoxification, stability in real water, and continuous-flow performance.

Conclusions:

• The synergistic effect between the 1T-phase electron highway and the Co/Mo redox cycle enables pathway-modulated ROS generation.
• Electronic structure engineering provides a design principle for advanced catalytic oxidation processes.
• The developed catalyst shows significant potential for practical environmental applications.