Effect of frequency and power on the piezocatalytic and sonochemical degradation of dyes in water
Effect of frequency and power on the piezocatalytic and sonochemical degradation of dyes in water
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DOI：
10.1016/j.ceja.2023.100477
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发表时间：
2023-03-09
影响因子：
--
通讯作者：
Tudela, Ignacio
中科院分区：
文献类型：
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作者：
Bossl, Franziska;Menzel, Valentin C.;Tudela, Ignacio
本文首次系统地评价了频率对染料压电催化降解的影响。为了实现这一目标，使用了系统和实验装置的组合，工作在从20 kHz到1 MHz的不同超声波频率下。此外，超声波功率的影响在低超声频率为20 kHz和高超声频率为576 kHz的情况下进行了研究，为围绕压电催化背后的“真实”机制的有争议的讨论提供了更多的线索。结果表明，声空化产生的机械效应在较低的超声频率（100 kHz）下占主导地位，声空化产生的化学效应非常显著，这就提出了一个问题，即当优化频率和功率可能足以使声化学以快速的速度（伪一级降解反应速率常数高达0.037 min(-1)）完全降解有机污染物时，是否真的需要压电催化剂。
For the very first time, the effect of frequency on the piezocatalytic degradation of dyes has been systematically evaluated. To achieve this, a combination of systems and experimental setups operating at different ultrasonic frequencies ranging from 20 kHz up to 1 MHz were used. In addition, the effect of ultrasonic power was investigated at a low ultrasonic frequency of 20 kHz and higher ultrasonic frequency of 576 kHz to shed more light into the controversial discussion surrounding the 'true' mechanisms behind piezocatalysis. The results revealed that mechanical effects derived from acoustic cavitation, predominant at lower ultrasonic frequencies (100 kHz), the chemical effects derived from acoustic cavitation were so remarkable, that it raised the question of whether a piezocatalyst is really necessary when the optimisation of frequency and power may be enough for sonochemistry to fully degrade organic pollutants at a fast rate (pseudo first-order degradation reaction rate constant up to 0.037 min(-1)).