Abstract
Sodium bismuth titanate (Bi0.5Na0.5TiO3, BNT) is a typical lead-free piezoelectric material with perovskite structure, which exhibits great potential as piezo-photocatalyst but limited by the little response on visible light and insufficient carriers for efficient catalytic reactions. Herein, a novel BNT/CdS heterojunction was facilely synthesized by the two-step hydrothermal process for significantly enhanced piezo-photocatalytic degradation of organic dyes. The CdS nanoparticles with 35 nm in diameter are uniformly decorated on the highly crystallized BNT spheres. The obtained BNT/CdS heterojunction displays strong absorption of visible light because of the narrow band gap of CdS. Due to the strong built-in electric field under ultrasonic and efficient excitation by visible light, the photogenerated carriers can be efficiently separated at the BNT/CdS interface and migrate to the surface for catalytic reactions. As a result, the BNT/CdS shows much higher piezo-photocatalytic activity than that of BNT and can degrade 99% RhB within 60 min. Meanwhile, the piezo-photocatalytic performance of BNT/CdS is far better than that of individual photocatalysis or piezocatalysis. Moreover, the catalytic experiments in the presence of different scavengers indicate that ·O2− is the predominant active specie. The synthetic process is simple, low-cost, and controllable to produce high-performance BNT/CdS and is believed to show promising application prospect.
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This work was supported by the Science and Technology Department of Shaanxi Province (2022JM-072) and the Key Scientific Research Project Foundation of Ningxia (No. 2022BDE03001).
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Cong-Miao Zhang: investigation, characterization, writing—original draft preparation; Meng-Jie Chang: supervision, response for the whole research work, financial support; Wen-Juan Li: characterization; Hui Wang: reviewing and editing; Jun Liu: methodology, data curation; Xiao Liu: discussion, financial support.
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Chang, MJ., Zhang, CM., Li, WJ. et al. Significantly enhanced the light absorption and charge separation of Bi0.5Na0.5TiO3 by coupling with CdS for high-performance piezo-photocatalysis. Environ Sci Pollut Res 30, 109410–109422 (2023). https://doi.org/10.1007/s11356-023-30070-1
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DOI: https://doi.org/10.1007/s11356-023-30070-1