The Type II heterojunction, characterized by its favorable band alignment, facilitated efficient charge separation in photocatalysts. Concurrently, oxygen vacancies can enhance light absorption and activated reactants, thereby improving photocatalytic efficiency. This study presented the synthesis of Bi-TCPP/Bi 2 S 3 heterojunction photocatalysts, which were rich in oxygen vacancies, using a green, one-pot method. The composite exhibited superior photoelectrochemical and photocatalytic reduction properties, achieving a rate constant of 0.03829 min −1 for Cr(VI) reduction and a remarkable reduction rate of 95.73%. After five cycles, the photocatalytic activity remained above 91.30%, demonstrating excellent stability and efficiency in reducing persistent pollutants. This work introduced a novel strategy for photocatalyst design and made a significant contribution to the fields of environmental remediation and green chemistry.
Bismuth metal–organic frameworks (MOFs) as catalysts are scarce. Herein, the first MOF comprising meso- tetra(4-carboxyphenyl) porphine (TCPP) as an organic ligand and Bi ion as a metal node, denoted as Bi-TCPP, is synthesized by a convenient one-step hydrothermal method. Compared to other 2D (Cu-TCPP) or 3D (PCN-222) MOFs with TCPP as a ligand, Bi-TCPP has ultrafast singlet oxygen generation ability and a high photothermal conversion efficiency of 49.5% under the irradiation of 660 nm light. This is due to Bi-TCPP's strong ligand-to-metal charge transfer (LMCT) events that form singlet oxygen ( 1 O 2 ). Further, when the electrons and holes above the bandgap relax to the band edge, the excess energy is converted into heat. In vitro and in vivo experiments show excellent antibacterial and repair effects. Hence, the synthesis of Bi-TCPP provides new ideas for the study of rare bismuth-based MOFs, and its excellent biocompatibility provides a possibility for further application.
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