Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
J Hazard Mater. 2018 Sep 15;358:187-197. doi: 10.1016/j.jhazmat.2018.06.002. Epub 2018 Jun 3.
In order to break the high operating cost bottleneck of electrochemical treatment of aqueous flutriafol (FTF), an emerging fungicide, a novel three-dimensional ordered macroporous PbO (3DOM-PbO) filter was designed to facilitate mass transfer. The effects of operating parameters, including current density, flow rate and initial concentration on FTF electrooxidation performance were investigated using conventional flat Ti/PbO (F-Ti/PbO) and 3DOM-PbO filters, with primary objective being the development of appropriate parameters for FTF treatment. The results indicated that the FTF removal efficiency on 3DOM-PbO filter was improved by 2.8 times compared to that on F-Ti/PbO at 5 mA cm, 10 ml s and 100 mg L FTF. The corresponding electrical energy consumption was reduced by 2.7 times, ` TOC removal and mineralization current efficiency were enhanced by 4.9 and 4.8 times, respectively. Furthermore, aromatic intermediates, nitrogenous compounds and carboxylic acids were identified as main byproducts using experimental method combined with quantum chemical calculations. Then, a possible pathway of FTF degradation on 3DOM-PbO was proposed. Finally, the acute toxicity results showed that toxicity of the byproducts first increases and then decreases through the proposed route. LC value of FTF wastewater increased 35%-70% on the 3DOM-PbO filter, indicating a significant biodegradability enhancement.
为了打破电化学处理新型杀菌剂氟环唑（FTF）的高运行成本瓶颈，设计了一种新型的三维有序大孔 PbO（3DOM-PbO）过滤器，以促进传质。使用传统的平板 Ti/PbO（F-Ti/PbO）和 3DOM-PbO 过滤器研究了操作参数（包括电流密度、流速和初始浓度）对 FTF 电氧化性能的影响，主要目的是为 FTF 处理开发合适的参数。结果表明，与 F-Ti/PbO 相比，在 5 mA cm、10 ml s 和 100 mg L FTF 时，3DOM-PbO 过滤器上 FTF 的去除效率提高了 2.8 倍。相应的电能消耗降低了 2.7 倍，TOC 去除率和矿化电流效率分别提高了 4.9 倍和 4.8 倍。此外，使用实验方法结合量子化学计算鉴定了主要的芳香族中间体、含氮化合物和羧酸作为副产物。然后，提出了 FTF 在 3DOM-PbO 上降解的可能途径。最后，急性毒性结果表明，通过提出的途径，副产物的毒性先增加后降低。3DOM-PbO 过滤器上 FTF 废水的 LC 值增加了 35%-70%，表明生物降解性显著增强。
