Interface Effects of Micro/nanobubbles Enable Selective Photooxidation of Contaminants

作者：Rongsheng Ning, Shane A. Snyder, Jun Ma, Denghui Wang, Pan Li, Qian Xiao, Yingying Xiang, Gongduan Fan, Zhongsen Yan, Naiyun Gao, Shuili Yu, Lei Li · 发表于：Environmental Science & Technology · 年份：2025 · DOI：10.1021/acs.est.5c11061 · 被引用次数：10 · 研究领域：Minerals Flotation and Separation Techniques、Advanced oxidation water treatment、Pickering emulsions and particle stabilization

Micro/nanobubbles (MNBs), due to their unique interface properties, have demonstrated remarkable potential in enhancing advanced oxidation processes (AOPs) in water. These gas–liquid interfaces enhance oxidation efficiency by facilitating oxidant mass transfer and contaminants adsorption. While the role of interface reactions is well-documented, the influence of MNBs-induced effects on contaminant removal mechanisms in aqueous phase reactions remains inadequately understood. To bridge this knowledge gap, an oxygen MNBs/ultraviolet/hydrogen peroxide (O-MNBs/UV/H 2 O 2 ) photooxidation system was developed to explore the role of interface effects in aqueous phase reactions. Model contaminants, including representative natural and synthetic organic compounds commonly found in surface waters, were selected to evaluate the removal performance. The results indicated that the removal efficiency of contaminants was significantly influenced by the electrostatic and hydrophobic properties of the contaminants. Notably, the O-MNBs enhanced activation of H 2 O 2 by improving UV-light utilization and oxygen mass-transfer efficiency, leading to increased production of reactive oxygen species (ROS) in the aqueous phase. Meanwhile, surface repulsion induced by electrostatic and hydrophobic forces facilitated the migration of contaminants into the aqueous phase, thereby enhancing their contact with ROS and enabling selective oxidation. These findings reveal that MNB-mediated interface effects ...