School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510640, PR China.
School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510640, PR China.
J Hazard Mater. 2021 Oct 15;420:126556. doi: 10.1016/j.jhazmat.2021.126556. Epub 2021 Jul 2.
Imidacloprid (IMI), as the most-consumed pesticide, has posed a severe threat to the water ecosystem due to its recalcitrance and inefficient elimination in the traditional wastewater treatment. Herein, a heterogeneous electro-Fenton (EF) system coupled with 3D-MoO-porous biochar (PBC) cocatalytic electrodes, abbreviated as 3D-MPE-EF, is initially applied to promote the elimination of IMI in the agrochemical wastewater from pesticide production. The elimination rate of IMI by 3D-MPE-EF system is 18.15 times higher than that by traditional EF system at pH 7.0. The utilization of 3D-MoO-PBC electrodes sufficiently compensates for inherent deficiencies of traditional EF system. The circular utilization of Fe is also addressed by 3D-MoO-PBC cocatalytic electrodes to reduce the consumption of Fe and the deposition of iron mud. Through comparison, MoO is considered the most appropriate cocatalyst in terms of the reutilization of Fe and degradation of IMI. Eight mechanisms are identified in the degradation pathways of IMI by UPLC-Q-TOF-MS. The ecotoxicities of IMI are remarkably attenuated in the 3D-MPE-EF system. This study provides insights into the roles of 3D-MoO-PBC cocatalytic electrodes in the enhanced elimination of IMI in heterogeneous EF system.
吡虫啉（IMI）作为最常用的农药，由于其在传统废水处理中的顽固性和低效去除，对水生态系统构成了严重威胁。在此，首次应用非均相电芬顿（EF）系统与 3D-MoO-多孔生物炭（PBC）共催化电极相结合的方法，简称 3D-MPE-EF，以促进农药生产中农用化学品废水中 IMI 的去除。在 pH 7.0 时，3D-MPE-EF 系统对 IMI 的去除率比传统 EF 系统高 18.15 倍。3D-MoO-PBC 电极的利用充分弥补了传统 EF 系统的固有缺陷。3D-MoO-PBC 共催化电极还解决了 Fe 的循环利用问题，减少了 Fe 的消耗和铁泥的沉积。通过比较，MoO 被认为是最适合用于 Fe 再利用和 IMI 降解的共催化剂。通过 UPLC-Q-TOF-MS 确定了 IMI 降解途径中的 8 种机制。在 3D-MPE-EF 系统中，IMI 的生态毒性显著降低。本研究为 3D-MoO-PBC 共催化电极在增强非均相 EF 系统中 IMI 去除中的作用提供了新的见解。
