Acetamiprid (Ace) and cadmium (Cd) in paddy fields had caused serious impact on natural ecosystems and human health. In this study, Fe-Mn-BC ternary micro-electrolysis filler was successfully prepared and used to remove Ace and Cd in situ in paddy fields via constructing “Fe-Mn-BC micro-electrolysis-microorganism” system. The adsorption capacity of Fe-Mn-BC on Cd and Ace were 62.92 mg/g and 236.18 mg/kg, which were twice and six times than those of zeolites, respectively. In the laboratory simulated experiments, the removal efficiencies of Ace and Cd in CW with Fe-Mn-BC were around 85.0 %. The Ace was decomposed into macromolecular substances by electron transfer in the anodic oxidation process by Fe-Mn-BC and then degraded to water and carbon dioxide by microorganism, while Cd was mainly removed through adsorption of filler and microorganism and the coprecipitation with OH- form cathode and Fen+ from anode to form CdXFe(1-X)(OH)2. The introduce of Fe-Mn-BC promoted the production of microbial extracellular polymeric substances (mainly protein), favorable for Cd and Ace adsorption. Metagenomic sequencing results showed that the Fe-Mn-BC enriched the microorganism related to Ace degradation such as Streptomyces, Nonomuraea, Pseudonocardia, and Nocardia, and enhanced the relative abundances of Cd resistance genes (ABC.CD.P, ABC-2.A and ABC-2.P), and the Ace degradation genes (mcp, pht5, etbAa, TENA_E and ylmB), promoting the removal of Ace and Cd. This study proposed a multi-functional and easy-operated way for the removal of Ace and Cd from soil and water in paddy fields.

中文翻译：

---

Fe-Mn-BC三元微电解强化水田土壤水中啶虫脒和镉的同时去除性能、机理和途径


稻田中的啶虫脒 （Ace） 和镉 （Cd） 对自然生态系统和人类健康造成了严重影响。本研究成功制备了 Fe-Mn-BC 三元微电解填料，并通过构建“Fe-Mn-BC 微电解-微生物”系统，用于原位去除稻田中的 Ace 和 Cd。Fe-Mn-BC 对 Cd 和 Ace 的吸附容量分别为 62.92 mg/g 和 236.18 mg/kg，分别是沸石的 2 倍和 6 倍。在实验室模拟实验中，Fe-Mn-BC 对 CW 中 Ace 和 Cd 的去除效率约为 85.0 %。Ace 在阳极氧化过程中通过 Fe-Mn-BC 的电子转移分解成大分子物质，然后被微生物降解为水和二氧化碳，而 Cd 主要通过填料和微生物的吸附以及与 OH- 形成阴极和 Fen+ 的共沉淀去除，形成 CdXFe（1-X）（OH）2。Fe-Mn-BC 的引入促进了微生物胞外聚合物（主要是蛋白质）的产生，有利于 Cd 和 Ace 的吸附。宏基因组测序结果显示，Fe-Mn-BC 富集了链霉菌属、Nonomuraea、假结核菌属和诺卡菌属等与 Ace 降解相关的微生物，并增强了 Cd 抗性基因 （ABC.CD.P，ABC-2。A 和 ABC-2。P） 和 Ace 降解基因 （mcp、pht5、etbAa、TENA_E 和 ylmB），促进 Ace 和 Cd 的去除。本研究提出了一种多功能、易操作的稻田土壤和水中Ace和Cd的去除方法。