Abstract
In the electron-mediated persulfate activation reaction, oxidation efficiency and interference resistance present a challenging contradiction. Addressing this issue requires an exploration of methods to regulate the redox potential of reactants and finding a delicate balance between high efficiency and immunity to interference. However, achieving precise potential regulation remains a significant challenge. By loading CoPc onto CNTs with varying diameters, composite structures with distinct levels of curvature in the reaction sites were engineered. The progressively increasing curved strain created a volcano-like redox potential in the catalyst, resulting in a corresponding pollutants removal effect. Investigation of the electronic structure revealed that this trend shift was attributed to the broadening of π band, impacting its electron transfer proclivity and elevating the redox potential. Additionally, the augmented overlap area of the π orbitals of CNT and Co expedited electron transfer between them, escalating the reaction rate. The system demonstrates the capability to finely adjust the redox potential of catalyst-PS* while exhibiting robust resistance to interference from other substances, indicating the prospective utility of CNT-based catalysts in continuous water treatment devices to alleviate ecological risks linked to pollutants.
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