National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, PR China.
Chemosphere. 2022 Mar;291(Pt 3):132897. doi: 10.1016/j.chemosphere.2021.132897. Epub 2021 Nov 12.
An iron-copper graphite felt (Fe-Cu/HGF) electrode was successfully prepared by heat treatment and impregnation of graphite felt as the support followed by calcination, and an electro-activated peroxydisulfate (E-PDS) system with Fe-Cu/HGF as the cathode was constructed to degrade Diuron. This system synergistically activated PDS through electrochemical processes and transition metal catalysis. High-valence metal ions could be converted into low-valence metal ions by reduction at the cathode, and low-valence metal ions continuously activated PDS to generate more sulfate radicals (SO) and hydroxyl radicals (OH) to accelerate Diuron degradation. The Fe-Cu/HGF composite cathode exhibited a performance superior to graphite felt (RGF) obtained using pretreatment only, including increased hydrophilicity, significantly increased number of defect sites and larger electroactive surface area. Under optimized experimental degradation conditions, Diuron could be completely removed in 35 min, at which time copper ion leaching was not detected in the solution, while the total iron ion concentration was 0.27 mg L. Extending the reaction time to 6 h, the amount of total organic carbon was reduced to 32.2%. In addition, the free radicals that degraded Diuron were identified as mainly SO and OH with a slightly higher contribution of SO. The mechanism and pathways of Diuron degradation in the E-PDS system were determined. The E-PDS system was successfully applied to the degradation of other pollutants and the degradation of Diuron in different simulated water environments. In summary, the E-PDS system using Fe-Cu/HGF as the cathode is a promising treatment method for Diuron-containing wastewater.
一种铁铜石墨毡（Fe-Cu/HGF）电极通过热处理和浸渍石墨毡作为支撑物，然后进行煅烧成功制备，构建了一个以 Fe-Cu/HGF 为阴极的电激活过硫酸盐（E-PDS）体系来降解敌草隆。该体系通过电化学过程和过渡金属催化协同激活 PDS。高价金属离子可以在阴极还原成低价金属离子，而低价金属离子不断激活 PDS 以生成更多的硫酸根自由基（SO）和羟基自由基（OH），从而加速敌草隆的降解。Fe-Cu/HGF 复合阴极的性能优于仅经过预处理的石墨毡（RGF），包括增加的亲水性、显著增加的缺陷位数量和更大的电活性表面积。在优化的实验降解条件下，敌草隆可以在 35 分钟内完全去除，此时溶液中未检测到铜离子浸出，而总铁离子浓度为 0.27mg/L。将反应时间延长至 6 小时，总有机碳的量减少到 32.2%。此外，降解敌草隆的自由基主要是 SO 和 OH，SO 的贡献略高。确定了 E-PDS 体系中敌草隆的降解机制和途径。E-PDS 体系成功应用于其他污染物的降解和不同模拟水环境中敌草隆的降解。总之，以 Fe-Cu/HGF 为阴极的 E-PDS 体系是一种有前途的处理含敌草隆废水的方法。
