Bi2SiO5 nanosheets as piezo-photocatalyst for efficient degradation of 2,4-Dichlorophenol

Applied Catalysis B: Environment and Energy Pub Date : 2024-09-07 DOI:10.1016/j.apcatb.2024.124581

Hangyu Shi, Yifu Li, Lishan Zhang, Guoguan Liu, Qian Zhang, Xuan Ru, Shan Zhong

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Abstract

Piezo-photocatalysis is an effective solution for degrading organic pollutants. In this study, BiSiO nanosheets are successfully synthesized via a one-step hydrothermal method. The piezo-photocatalytic degrading mechanisms of 2,4-Dichlorophenol (2,4-DCP) on BiSiO nanosheets are thoroughly investigated through the integration of experimental study and density functional theory (DFT) calculations. Experimental results revealed outstanding piezoelectric properties for BiSiO nanosheets with a piezoelectric coefficient of 250 pC/N, outperforming previously reported piezo-photocatalysts. The degradation rate constant of 2,4-DCP on BiSiO nanosheets reached 0.0891 min by piezo-photocatalysis, which is 17 and 1.8 times higher than that by solitary photo- and piezo-catalysis, respectively. Furthermore, DFT calculations for BiSiO explain the crucial role of piezoelectric effects in bending its band structure, regulating photogenerated carrier behaviors, and promoting reactive oxygen species (ROS) generation. Finally, the degradation pathways of 2,4-DCP on BiSiO nanosheets were revealed with details. The results of this study offer valuable insights for water treatment with piezo-photocatalysis.

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作为压电光催化剂高效降解 2,4-二氯苯酚的 Bi2SiO5 纳米片材

压电光催化是降解有机污染物的有效解决方案。本研究通过一步水热法成功合成了 BiSiO 纳米片。通过实验研究和密度泛函理论（DFT）计算相结合的方法，深入研究了 BiSiO 纳米片上 2,4-DCP 的压电光催化降解机理。实验结果表明，BiSiO 纳米片具有出色的压电特性，压电系数为 250 pC/N，优于之前报道的压电光催化剂。通过压电光催化，2,4-二氯丙醇在 BiSiO 纳米片上的降解速率常数达到 0.0891 分钟，分别是单独光催化和压电催化的 17 倍和 1.8 倍。此外，BiSiO 的 DFT 计算解释了压电效应在弯曲其带状结构、调节光生载流子行为和促进活性氧（ROS）生成方面的关键作用。最后，详细揭示了 2,4-DCP 在 BiSiO 纳米片上的降解途径。研究结果为利用压电光催化技术进行水处理提供了宝贵的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Catalysis B: Environment and Energy

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