铁锰复合阴极MFC-EF耦合系统产电及降解RhB效能

Electricity production and RhB degradation in MFC-EF coupling system with iron and manganese composite cathode

为实现微生物燃料电池(MFC)微电的原位利用,结合电芬顿(EF)技术的优势,构建MFC-EF耦合系统.为进一步提高该耦合系统性能,在Fenton催化剂铁的基础上引入类芬顿(Fenton-like)催化剂锰,制备出铁锰双金属复合阴极(FeMnO x/CF复合电极,其中CF指碳纤维刷),并与碳纤维(CF)无负载电极、Fe&Fe 2 O 3/CF复合电极对比,探究MFC-EF耦合系统的电化学性能及其对目标污染物罗丹明B(RhB)的降解效果.结果表明,铁锰复合电极成功负载了Fe和Mn的二元金属氧化物,提高了耦合系统的最大输出功率(5.47 W/m 3),降低了电池的内阻(109.00Ω),提高了RhB的去除率(91.60%)和矿化率(30.84%).此外,FeMnO x/CF复合电极摆脱了常规Fenton体系对阴极液pH的严格限制,扩大了MFC-EF耦合系统的阴极液pH范围.本研究实现了污染物处理过程中的资源再生和利用,有望为实际染料废水处理提供新的思路.

In order to realize in-situ utilization of weak current generated in microbial fuel cell(MFC),an MFC-EF coupling system was constructed by utilizing the advantages of electro-Fenton(EF)technology.To further improve the performance of the coupling system,a composite cathode of iron and manganese(FeMnO x/CF composite electrode,CF refers to carbon fiber brush)was prepared,which introduced Fenton-like catalyst manganese on the basis of Fenton catalyst iron.The electrochemical performance of the MFC-EF coupling system and its degradation effect on Rhodamine B(RhB)were investigated by being compared with CF unloaded electrode and Fe&Fe 2 O 3/CF composite electrode.Results showed that FeMnO x/CF composite electrode was successfully loaded with the binary metal oxides of Fe and Mn.The maximum output power of the coupling system was improved(5.47 W/m 3),the internal resistance of the MFC was reduced(109.00Ω),and both the removal rate(91.60%)and mineralization rate(30.84%)of RhB were increased.Besides,the FeMnO x/CF composite electrode was free from the strict restriction of catholyte pH in conventional Fenton system,and the pH range of catholyte in MFC-EF coupling system was expanded.The study can realize the regeneration and utilization of resources in the process of pollutant removal,which is expected to provide a new idea for practical dye wastewater treatment.