International Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi, People's Republic of China.
Environ Technol. 2024 Dec;45(28):6200-6209. doi: 10.1080/09593330.2024.2328660. Epub 2024 Mar 12.
A 10-litre pilot scale micro-nano bubble (MNB)-enhanced photocatalytic degradation system was developed using ZnO as the photocatalyst and salicylic acid (SA) as the model pollutant. The effectiveness of the MNB/ZnO/UV system was systematically compared with those of MNB, UV, MNB/UV, MNB/ZnO and ZnO/UV degradation systems. The effects of process parameters, including catalyst dosage, pollutant concentration, air-intake rate, pH and salt content on the degradation of SA, were comprehensively investigated. Optimum performance was obtained at neutral conditions with a catalyst dosage of 0.3 g/L and an air-intake rate of 0.1 L/min. For the degradation of SA, a kinetic constant of 0.04126/min was achieved in the MNB/ZnO/UV system, which is 4.5 times greater than that obtained in the conventional ZnO/UV system. The substantial increase in the degradation rate can be attributed to that the air MNB not only enhanced the gas-liquid mass transfer efficiency but also elevated the concentration of dissolved oxygen. A 10-litre pilot scale MNB/ZnO/UV system was successfully applied to the purification of lake water and river water, demonstrating great application potential for wastewater treatment.
建立了一个 10 升规模的微纳米气泡（MNB）增强光催化降解系统，使用 ZnO 作为光催化剂，水杨酸（SA）作为模型污染物。系统地比较了 MNB/ZnO/UV 系统与 MNB、UV、MNB/UV、MNB/ZnO 和 ZnO/UV 降解系统的有效性。考察了工艺参数（包括催化剂用量、污染物浓度、进气速率、pH 值和盐含量）对 SA 降解的影响。在中性条件下，当催化剂用量为 0.3 g/L、进气速率为 0.1 L/min 时，可获得最佳性能。在 MNB/ZnO/UV 系统中，SA 的降解动力学常数为 0.04126/min，是常规 ZnO/UV 系统的 4.5 倍。降解速率的大幅提高可归因于空气 MNB 不仅增强了气液传质效率，还提高了溶解氧浓度。成功地将 10 升规模的 MNB/ZnO/UV 系统应用于湖水和河水的净化，展示了在废水处理方面的巨大应用潜力。
