A novel piezocatalyst, Bi₂WO₆ nanosheets (BWO NS), has been successfully synthesized by a simple, green and harmless solid-state chemistry method. The BWO NS present excellent piezocatalytic activity in contrast with other piezocatalysts towards methylene blue organic pollutant degradation under ultrasonic vibration. The piezocatalytic efficiency of BWO NS reaches ∼96% after 35 min and they exhibit good recycling performance, suggesting great potential for wastewater dye decolorization treatment. Superoxide radicals (˙O₂⁻) and hydroxyl radicals (˙OH) are the main active species during the piezocatalytic process, based on ESR measurements and fluorescence spectra. The induced generation of polarized electric charges in the piezocatalytic process has also been demonstrated. The piezocatalytic mechanism has been further revealed, indicating that the excellent piezocatalytic activity could be attributed to the piezoelectric effect inducing electric charges to accelerate carrier transport during chemical redox reactions. Our work could offer new guidance for designing novel piezocatalysts and shed light on the relationships between piezocatalytic properties and mechanisms for application in pollutant degradation and energy conversion.

中文翻译：

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增强Bi2WO6纳米片对有机污染物降解的压电催化性能。

通过简单，绿色和无害的固态化学方法已成功合成了新型的压电催化剂Bi ₂ WO ₆纳米片（BWO NS）。与其他压电催化剂相比，BWO NS在超声振动下对亚甲基蓝有机污染物的降解具有优异的压电催化活性。35分钟后，BWO NS的压电催化效率达到〜96％，并且它们具有良好的再循环性能，这表明废水染料脱色处理的潜力很大。超氧自由基（O ₂ ^-）和羟基自由基（˙OH）是压电催化过程中的主要活性物质，基于ESR测量和荧光光谱。还已经证明了在压电催化过程中感应产生的极化电荷。压电催化机理已被进一步揭示，表明优异的压电催化活性可归因于压电效应，其诱导电荷在化学氧化还原反应过程中加速载流子传输。我们的工作可以为设计新型压电催化剂提供新的指导，并阐明压电催化性能与污染物降解和能量转化应用机理之间的关系。