文献类型：期刊文献

英文题名：Ptfe Enhances In Situ Electro-Generation of H2o2 On Graphite Felt Cathode to Synchronously Degrade Cr(Vi) And Methyl Orange in the Flow-Through System

作者：Li, Li[1]; Zhang, Xinwan[1]; Shi, Yaqi[1]; Yang, Zhengwu[1]; Yin, Di[2]; Chen, Peng[3]; Zhang, Lehua[1,4]

机构：[1] National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong; [3] School of Biology, Food, and Environment, Hefei University, Hefei, 230601, China; [4] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240130088)

语种：英文

外文关键词：Citrus fruits - Contamination - Effluents - Electrocatalysis - Felt - Felts - Graphite electrodes - Heavy metals - Mass transfer - Quantum chemistry - Stripping (dyes)

摘要：The co-existence of toxic hexavalent chromium [Cr(VI)] and synthetic organic dyes in dyeing effluents is a prevalent issue, while the simultaneous removal of these co-contaminants remains a great challenge. Electrocatalytic reduction of oxygen to hydrogen peroxide (H2O2) as reductant in the flow-through systems by achieving efficient generation and utilization of active sites is a promising strategy for Cr(VI) reducing detoxification, and electro-generated H2O2 can simultaneously degrade organic contaminants via hydroxyl radicals (?OH). Herein, we demonstrated a microfluidic-based flow-through electro-Fenton-like system with modified graphite felt (GF) electrode by constructing a gas diffusion micro-channel to generate H2O2 in situ and simultaneously degrade Cr(VI) and methyl orange (MO). This synergistic removal system promoted the degradation of Cr(VI) and MO compared to those in individual contaminant systems (Cr(VI) reduction reached 99.9%, while MO removal efficiency reached 99% simultaneously). Simulation study indicated that the increased number of accessible active sites and its induced nanoscale convection in flow-through system accelerated the nanoscale interfacial mass transfer at PTFE-electrode-solution. Moreover, active species monitoring and the quantum chemical calculation were applied to explore the synergistic mechanism and detailed pathway on the degradation of co-existing contaminants. This work demonstrated the feasibility of simultaneously converting heavy metals and organic dyes, holding a great promise to removal multiple contaminants in complex wastewater. ? 2024, The Authors. All rights reserved.