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Molecular oxygen is the most prevalent, economical, and environmentally friendly oxidant available. Activating molecular oxygen to produce reactive oxygen species (ROS) like hydroxyl radicals (•OH), superoxide radicals (•O2), singlet oxygen (1O2), and hydrogen peroxide (H2O2) is an efficient way to degrade resistant organic pollutants and sterilize microorganisms. Despite its viability, the spin-forbidden nature of this process limits its activation and applications. Piezoelectric catalysis has become significant for activating molecular oxygen in ROS production. The localized polarization charges generated by mechanical stress on the surface of piezoelectric materials can create an electric field, that effectively separates free electrons from holes. The produced electrons and holes migrate to opposite sides of the catalyst surface, accumulating at active sites where they react with molecular oxygen from dissolved oxygen or water to form ROS. Molybdenum disulfide (MoS), particularly in single and odd-numbered layers, has emerged as a novel piezocatalyst for activating molecular oxygen to generate ROS, offering a cost-effective approach to environmental remediation. However, the performances of MoS2 are not yet optimal, and a limited understanding of its molecular oxygen activation process hampers further development. Therefore, this review focuses on the structure and origin of the piezoelectric properties of MoS2, the strategies for enhancing its piezoelectric effect in activating molecular oxygen, and its efficiency in degrading oxidative aqueous pollutants.
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