School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, 1037 Luoyu Road, Wuhan, Hubei, 430074, China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, 1037 Luoyu Road, Wuhan, Hubei, 430074, China.
Chemosphere. 2019 Jan;215:173-181. doi: 10.1016/j.chemosphere.2018.10.018. Epub 2018 Oct 5.
Bio-electro-Fenton (BEF) system holds great potential for sustainable degradation of refractory organics. Activated carbon (AC) air cathode was modified by co-pyrolyzing of AC with glucose and doping with nano-zero-valent iron (denoted as nZVI@MAC) in order to promote two-electron oxygen reduction reaction (2e ORR) for enhanced oxidizing performance. Single chamber microbial fuel cells (SCMFCs) with nZVI@MAC cathode was examined to degrade landfill leachate. It was revealed that nZVI@MAC cathode SCMFC showed higher degradation efficiency towards landfill leachate. Six landfill leachate treatment cycles indicated that nZVI@MAC cathode SCMFC exhibited higher COD removal efficiencies over AC and nZVI@AC and greatly enhanced columbic efficiency compared to AC and nZVI@AC cathode. Anti-biofouling effect was found on nZVI@MAC cathode because of the high Fenton oxidation effects at the vicinity of the cathode. Electrochemical characterizations indicated that MAC cathode had superior 2e ORR capability than AC and nZVI@AC cathode, which was further evidenced by higher HO production from nZVI@MAC cathode in SCMFC. Graphitic structure of MAC was evidenced by High Resolution Transmission Electron Microscopy, and glucose pyrolysis also resulted in nano carbon spheres on the activated carbon skeletons. Raman spectra indicated more defects were generated on MAC during its co-pyrolyzation with glucose.
生物电化学-Fenton（BEF）系统在可持续降解难处理有机物方面具有巨大潜力。通过将活性炭（AC）与葡萄糖共热解并掺杂纳米零价铁（记为 nZVI@MAC）来改性 AC 空气阴极，以促进两电子氧还原反应（2e ORR），从而提高氧化性能。采用具有 nZVI@MAC 阴极的单室微生物燃料电池（SCMFC）来降解垃圾渗滤液。结果表明，nZVI@MAC 阴极 SCMFC 对垃圾渗滤液具有更高的降解效率。经过六次垃圾渗滤液处理循环，发现 nZVI@MAC 阴极 SCMFC 的 COD 去除效率高于 AC 和 nZVI@AC 阴极，并且与 AC 和 nZVI@AC 阴极相比，库仑效率大大提高。由于阴极附近具有高芬顿氧化效应，因此在 nZVI@MAC 阴极上发现了抗生物污垢效应。电化学特性表明，MAC 阴极比 AC 和 nZVI@AC 阴极具有更高的 2e ORR 能力，这进一步证明了 nZVI@MAC 阴极在 SCMFC 中产生了更高的 HO。高分辨率透射电子显微镜证实了 MAC 的石墨结构，并且葡萄糖热解还导致活性炭骨架上生成纳米碳球。拉曼光谱表明，在与葡萄糖共热解过程中，MAC 上产生了更多的缺陷。
