Liu Ting, Zhang Bin, Li Wenqian, Li Boda, Han Ziwen, Zhang Yanjie, Ding An, Wang Shutao, Ma Jun, He Xu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
Chemosphere. 2023 Jun;325:138361. doi: 10.1016/j.chemosphere.2023.138361. Epub 2023 Mar 10.
Ozone microbubbles have received increasing attention since they can produce hydroxyl radical (•OH) to decompose ozone-resistant pollutants. Besides, compared with conventional bubbles, microbubbles have a larger specific surface area and higher mass transfer efficiency. However, the research on the micro-interface reaction mechanism of ozone microbubbles is still relatively scarce. Herein, we systematically studied the stability of microbubbles, ozone mass transfer and atrazine (ATZ) degradation through multifactor analysis. The results revealed that bubble size was dominant in the stability of microbubbles, and gas flow rate played a major role in ozone mass transfer and degradation effects. Besides, the bubble stability accounted for the different effects of pH on ozone mass transfer in two aeration systems. Finally, kinetic models were built and employed to simulate the kinetics of ATZ degradation by •OH. The results revealed that conventional bubbles could produce •OH faster compared with microbubbles under alkaline conditions. These findings shed light on the interfacial reaction mechanisms of ozone microbubbles.
自臭氧微泡能够产生羟基自由基（•OH）以分解抗臭氧污染物以来，它们受到了越来越多的关注。此外，与传统气泡相比，微泡具有更大的比表面积和更高的传质效率。然而，关于臭氧微泡微界面反应机理的研究仍然相对较少。在此，我们通过多因素分析系统地研究了微泡的稳定性、臭氧传质和阿特拉津（ATZ）降解。结果表明，气泡尺寸在微泡稳定性中起主导作用，气体流速在臭氧传质和降解效果中起主要作用。此外，气泡稳定性解释了pH值在两种曝气系统中对臭氧传质的不同影响。最后，建立了动力学模型并用于模拟•OH降解ATZ的动力学。结果表明，在碱性条件下，传统气泡比微泡能更快地产生•OH。这些发现揭示了臭氧微泡的界面反应机理。
