Jian Dai, Zhenhao Fan, Yangke Long, Wenfeng Yue, Fu Huang, Yitao Jiao, Yuqun Deng, Yunfei Chang, Dawei Wang
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The rate constant k value of 46.95 × 10<jats:sup>−3</jats:sup> min<jats:sup>−1</jats:sup> for rhodamine B (RhB) piezocatalytic degradation of SBN‐hBM‐12h is almost 18 times higher than that of pristine SBN. Besides, the SBN‐hBM‐12 h catalyst performed superior antibacterial properties against Escherichia coli. The enhanced piezocatalytic efficiency is attributed to the introduced abundant oxygen vacancies absorbing and activating O<jats:sub>2</jats:sub> into reactive oxygen species. Well‐modulated oxygen vacancy concentration can effectively accelerate the generation and separation of free carriers. However, the excess oxygen vacancies in SBN render the weakened piezoresponse thus suppressing the piezocatalytic activity. 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引用次数: 0
摘要
压电催化技术能够利用机械能进行环境修复,被认为是一种值得开发的绿色环保技术。由于压电陶瓷的晶粒尺寸通常达到数十微米,因此很难用作高效压电催化剂。本文提出了一种可行而直接的方法,通过整合粒度优化和氧空位调制,将压电陶瓷粉末转化为高效压电催化剂。通过使用高能球磨(hBM)处理无铅 Sr0.5Ba0.5Nb2O6(SBN)压电陶瓷粉末,验证了这一策略。SBN-hBM-12h 压电催化降解罗丹明 B(RhB)的速率常数 k 值为 46.95 × 10-3 min-1,是原始 SBN 的近 18 倍。此外,SBN-hBM-12 h 催化剂还对大肠杆菌具有优异的抗菌性能。压电催化效率的提高归功于引入的大量氧空位吸收并活化 O2,使其转化为活性氧。良好调节的氧空位浓度可有效加速自由载流子的产生和分离。然而,SBN 中过量的氧空位会减弱压电响应,从而抑制压电催化活性。本研究阐明了氧空位在压电催化中的关键作用,并为开发高效压电催化剂提供了启示。
Remarkably Boosting Piezocatalytic Performance of Sr0.5Ba0.5Nb2O6 Piezoceramics via Size Optimization and Oxygen Vacancy Engineering
Piezocatalysis is capable of harnessing mechanical energy for environmental remediation, which is regarded as a green and promising technology to be exploited. Piezoceramics are struggling to be used as highly efficient piezocatalysts due to their grain size reaching tens of micrometers usually. Herein, a feasible and straightforward method is proposed to turn piezoceramic powders into highly efficient piezocatalysts by integrating size optimization and oxygen vacancy modulation. This strategy is validated by treating lead‐free Sr0.5Ba0.5Nb2O6 (SBN) piezoceramic powders with high‐energy ball‐milling (hBM). The rate constant k value of 46.95 × 10−3 min−1 for rhodamine B (RhB) piezocatalytic degradation of SBN‐hBM‐12h is almost 18 times higher than that of pristine SBN. Besides, the SBN‐hBM‐12 h catalyst performed superior antibacterial properties against Escherichia coli. The enhanced piezocatalytic efficiency is attributed to the introduced abundant oxygen vacancies absorbing and activating O2 into reactive oxygen species. Well‐modulated oxygen vacancy concentration can effectively accelerate the generation and separation of free carriers. However, the excess oxygen vacancies in SBN render the weakened piezoresponse thus suppressing the piezocatalytic activity. This study elucidates the critical role of oxygen vacancies in piezocatalysis and provides insights into the development of efficient piezocatalysts.
期刊介绍:
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