用于废水处理的 BaTiO3 纳米颗粒的催化活性：压电或声波驱动？,ACS Applied Nano Materials

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用于废水处理的 BaTiO3 纳米颗粒的催化活性：压电或声波驱动？
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-01-19 , DOI: 10.1021/acsanm.2c04568
Hossein Kalhori ₁ , Ifeanyichukwu C. Amaechi ₁ , Azza H. Youssef ₁ , Andreas Ruediger ₁ , Alain Pignolet ₁

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压电催化反应通常由超声波激发，因此，应与由不同机制（如声催化或摩擦催化）引起的其他催化反应同时发生。主要挑战之一是如何在催化实验中区分这些影响并量化每个贡献。为了区分这些效应，我们使用压电钛酸钡 (BaTiO ₃) 然后比较它们在压电到非压电相变温度以下和附近的催化性能，在该温度下晶体结构从低温四方压电相转变为高温立方非压电相。所有其他参数，如粒径、表面终止等，保持不变。整体相变发生在约 120 °C，但相变温度会随着粒径的变化而降低，对于约 20 nm 的粒径，相变温度会达到室温。透射电子显微镜和X射线衍射分别用于表征纳米粒子的形态和晶相。由于压电特性和晶格动力学密切相关，依赖于温度的拉曼光谱提供了对纳米和微观结构特性的更好洞察，从而可以估算铁电相变温度。BaTiO的催化活性₃纳米颗粒是通过监测含有模型污染物甲基橙的溶液的光吸收来确定的，该溶液在超声处理后向其中添加分散的压电BaTiO 3 颗粒_作为催化剂。_{已发现催化反应速率与 BaTiO 3}颗粒的晶体结构的四方畸变之间存在类似指数的相关性。_{我们的研究还证实，虽然 BaTiO 3}的 10% 催化反应与声催化或摩擦催化有关，但其余 90% 的总催化活性归因于压电催化作用。

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Catalytic Activity of BaTiO3 Nanoparticles for Wastewater Treatment: Piezo- or Sono-Driven?

Piezocatalytic reactions are generally excited by ultrasonication and, as such, should occur simultaneously with other catalytic reactions caused by different mechanisms such as sonocatalysis or tribocatalysis. One of the main challenges is how to discriminate between these effects in a catalysis experiment and quantify each contribution. In order to distinguish these effects, we use nano- and micro-particles of piezoelectric barium titanate (BaTiO₃) and then compare their catalytic properties below and close to the piezoelectric to non-piezoelectric phase transition temperature at which the crystalline structure changes from the low-temperature tetragonal, piezoelectric phase to the higher-temperature cubic, non-piezoelectric phase. All other parameters, such as particle size, surface termination, etc., remain unaltered. The phase transition in bulk occurs at about 120 °C, but the transition temperature decreases as a function of particle size and reaches room temperature for particle sizes of about 20 nm. Transmission electron microscopy and X-ray diffraction were used to characterize the morphology and crystalline phase of the nanoparticles, respectively. Since the piezoelectric properties and the lattice dynamics are closely related, temperature-dependent Raman spectroscopy provides an even better insight into the nano- and micro-structural properties, allowing the ferroelectric phase transition temperature to be estimated. The catalytic activities of the BaTiO₃ nanoparticles were determined by monitoring the optical absorption of a solution containing the model pollutant methyl orange, after ultrasonication of the solution to which were added the dispersed piezoelectric BaTiO₃ particles as catalysts. An exponential-like correlation has been found between the catalytic reaction rates and the tetragonal distortion of the crystal structure of the BaTiO₃ particles. Our study has also established that while 10% of the catalytic reaction of BaTiO₃ is related to either sonocatalysis or tribocatalysis, the remaining 90% of the overall catalytic activity is ascribed to the piezocatalytic contribution.

更新日期：2023-01-19

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