Horňák Radek, Čech Jan, St'ahel Pavel, Prokeš Lubomír, Trunec David, Rudolf Pavel, Maršálek Blahoslav
Department of Plasma Physics and Technology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
Brno University of Technology, Faculty of Mechanical Engineering, V. Kaplan Department of Fluid Engineering, Technická 2896/2, 616 69 Brno, Czech Republic.
J Phys Chem Lett. 2025 Jun 26;16(25):6279-6285. doi: 10.1021/acs.jpclett.5c00979. Epub 2025 Jun 13.
As strong oxidizers, OH radicals are crucial for water treatment applications involving plasma-liquid interactions. Hydrodynamic cavitation-based systems show promise for disinfection and micropollutant removal at flow rates of several m/h. Knowledge of the spatial distribution of OH is limited. However, this is vital for enhancing system efficiency. This study maps the spatial distribution of OH generated by electric discharge in a hydrodynamic cavitation cloud. Using Luminol as a chemiluminescent probe, the study addresses challenges related to probe stability and luminescence lifetime in a dynamic cavitation environment. Luminescence decay time was assessed with a fast-frame camera, and spatial mapping was conducted by using an ICCD camera with an optical filter. Strong emission was observed at the collapsing end of the cavitation cloud and within the discharge channel, indicating the production and transport of OH into the liquid.
作为强氧化剂，羟基自由基对于涉及等离子体-液体相互作用的水处理应用至关重要。基于水力空化的系统在流速为每小时数米时，显示出消毒和去除微污染物的潜力。关于羟基自由基空间分布的知识有限。然而，这对于提高系统效率至关重要。本研究绘制了水力空化云中放电产生的羟基自由基的空间分布图。该研究使用鲁米诺作为化学发光探针，解决了在动态空化环境中与探针稳定性和发光寿命相关的挑战。使用快速帧相机评估发光衰减时间，并使用带光学滤光片的ICCD相机进行空间映射。在空化云的坍塌末端和放电通道内观察到强烈发射，表明羟基自由基在液体中的产生和传输。
