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Ultrathin Two-Dimensional BiOCl with Oxygen Vacancies Anchored in Three-Dimensional Porous g‑C3N4 to Construct a Hierarchical Z‑Scheme Heterojunction for the Photocatalytic Degradation of NO

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posted on 27.12.2021, 17:37 authored by Mengmeng Wang, Beibei Wang, Bingke Xie, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Dongyun Chen, Jianmei Lu
In this paper, we successfully designed a hierarchical Z-scheme heterojunction with adjustable oxygen vacancy concentration, in which ultrathin two-dimensional BiOCl nanosheets with oxygen vacancies (OVs) were anchored on porous three-dimensional g-C3N4 spheres to obtain BiOCl-OVs/g-C3N4 spherical composites. The synergistic effect of oxygen vacancies and Z-scheme heterojunctions on composite BiOCl-OVs/g-C3N4 spheres increases the transmission rate of photogenerated carriers and inhibits the recombination of electrons and holes. Meanwhile, OVs are not only used as electronic media but also as the recombination and storage centers of photogenerated carriers. The porous structure of the three-dimensional spheres provides a larger specific surface area and an open pore structure, which facilitates the circulation and transfer of pollutant gases. The above characteristics give BiOCl-OVs/g-C3N4 spheres excellent performance in degrading NO under visible light, at rates of up to 66.5%. In addition, cycle experiments and X-ray diffraction (XRD) indicate that the material also has excellent stability and recyclability.

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