Simultaneously Providing Iron Source toward Electro-Fenton Process and Enhancing Hydrogen Peroxide Production via a Fe 3 O 4 Nanoparticles Embedded Graphite Felt Electrode

作者：Tingting Lian, Chao Huang, Feng Liang, Xinyong Li, Jingyu Xi · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b16236 · 被引用次数：48 · 研究领域：Advanced oxidation water treatment、Electrocatalysts for Energy Conversion、Advanced battery technologies research

Electro-reduction of O 2 to generate H 2 O 2 is an attractive alternative to the current anthraquinone process and quite necessary for chemical industries and environmental remediation. In general, sufficient porous structure contributes to expose more catalytic active sites and shorten diffusion paths for the heterogeneous catalysis of O 2 . In this work, initially the Fe 3 O 4 nanoparticles embedded graphite felt (Fe 3 O 4 @GF) is prepared through a mild hydrothermal following with thermal reduction method. This special combination not only provides iron source for the electro-Fenton reaction but also supplies rich active sites from the Fe 3 O 4 embedded structure with abundant cracks, which are beneficial to increase the reaction rate. Compared with raw graphite felt (RGF), fresh Fe 3 O 4 @GF exhibits superior pollutant degradation kinetics with more than 400% increase and approximately 37.8% improvement to the removal of total organic carbon. A 98% decolorization of rhodamine B (RhB) can be achieved in just 5 min and quickly completes 100% removal of RhB in the next few seconds. As the electro-Fenton reaction progresses, Fe 3 O 4 dissolves in the electrolyte, leaving a porous structure on the surface of the GF to form a porous GF (PGF), and the rapid radical reaction activates the GF surface. Both the chemical etching of Fe 3 O 4 and the electro-Fenton process can further increase the specific surface area, defects, and actives sites of the electrode. As expected, the act...