Simultaneously Providing Iron Source toward Electro-Fenton Process and Enhancing Hydrogen Peroxide Production via a Fe3O4 Nanoparticles Embedded Graphite Felt Electrode
发表时间：2020-02-12
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- 论文类型：
- 期刊论文
- 第一作者：
- Lian, Tingting
- 通讯作者：
- Xi, JY (reprint author), Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Guangdong, Peoples R China.
- 合写作者：
- Huang, Chao,Liang, Feng,Li, Xinyong,Xi, Jingyu
- 发表时间：
- 2019-12-11
- 发表刊物：
- ACS APPLIED MATERIALS & INTERFACES
- 收录刊物：
- PubMed、SCIE
- 文献类型：
- J
- 卷号：
- 11
- 期号：
- 49
- 页面范围：
- 45692-45701
- ISSN号：
- 1944-8244
- 关键字：
- Fe3O4; electro-Fenton reaction; hydrogen peroxide production; porous graphite felt; degradation kinetics
- 摘要：
- Electro-reduction of O-2 to generate H2O2 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 Fe3O4 nanoparticles embedded graphite felt (Fe3O4@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 Fe3O4 embedded structure with abundant cracks, which are beneficial to increase the reaction rate. Compared with raw graphite felt (RGF), fresh Fe3O4@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, Fe3O4 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 Fe3O4 and the electro-Fenton process can further increase the specific surface area, defects, and actives sites of the electrode. As expected, the active PGF exhibits favorable performance of H2O2 production in electrolytes of different pHs: 1 (320.0 +/- 36.5 mg L-1), 3 (301.9 +/- 13.2 mg L-1), and 7 (320.4 +/- 21.2 mg L-1). The degradation performance of PGF does not significantly decay even after 20 cycles of repeated use, indicating the good structural stability and long-term durability. The superiority of the in situ Fe source and fast reaction kinetics for electro-Fenton of Fe3O4@GF is confirmed, and this holey engineered strategy also provides the possibility to achieve swift water purification and open up a new way for developing efficient carbon-based electrodes.
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- 否
