School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Sep;26(26):27032-27042. doi: 10.1007/s11356-019-05868-7. Epub 2019 Jul 16.
In the present study, the electrocatalytic degradation of triazine herbicide metamitron using Ti/PbO-CeO composite anode was studied in detail. The effects of the current density, initial metamitron concentration, supporting electrolyte concentration, and initial pH value were investigated and optimized. The results revealed that an electrocatalytic approach possessed a high capability of metamitron removal in aqueous solution. After 120 min, the removal ratio of metamitron could reach 99.0% in 0.2 mol L NaSO solution containing 45 mg L metamitron with the current density at 90 mA cm and pH value at 5.0. The reaction followed the pseudo-first-order kinetics model. HPLC and HPLC-MS were employed to analyze the degradation by-products in the metamitron oxidization process, and the degradation pathway was also proposed, which was divided into two sub-routes according to the different initial attacking positions on metamitron by hydroxyl radicals. Therefore, the electrocatalytic approach was considered as a very promising technology in practical application for herbicide wastewater treatment.
在本研究中，详细研究了使用 Ti/PbO-CeO 复合阳极电催化降解三嗪类除草剂甲灭威。考察并优化了电流密度、甲灭威初始浓度、支持电解质浓度和初始 pH 值的影响。结果表明，电催化方法在水溶液中具有很高的甲灭威去除能力。在电流密度为 90 mA cm、pH 值为 5.0 的条件下，在含有 45 mg L 甲灭威的 0.2 mol L NaSO 溶液中，经过 120 min，甲灭威的去除率可达 99.0%。反应遵循准一级动力学模型。采用 HPLC 和 HPLC-MS 分析了甲灭威氧化过程中的降解产物，并提出了降解途径，根据羟基自由基对甲灭威的不同初始攻击位置，将其分为两条子路径。因此，电催化方法被认为是一种很有前途的实际应用技术，可用于处理除草剂废水。
