Design of a visible light driven photo-electrochemical/electro-Fenton coupling oxidation system for wastewater treatment.
Design of a visible light driven photo-electrochemical/electro-Fenton coupling oxidation system for wastewater treatment.
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DOI：
10.1016/j.jhazmat.2012.08.070
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发表时间：
2012-11
影响因子：
13.6
通讯作者：
Xing Ding;Zhihui Ai;Lizhi Zhang
中科院分区：
文献类型：
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作者：
Xing Ding;Zhihui Ai;Lizhi Zhang
在本研究中，我们报告了一个光电化学/电芬顿氧化（PEC/EF）系统耦合可见光驱动的光电化学氧化（PEC）和电芬顿氧化（EF）在一个完整的细胞。以FTO玻璃为载体制备的Bi 2 WO 6纳米片（Bi 2 WO 6/FTO）和活性炭纤维为载体制备的Fe@Fe2O3核壳纳米线（Fe@Fe2O3/ACF）分别作为PEC/EF体系的阳极和阴极。在自然pH条件下，PEC/EF体系对罗丹明B的降解活性远高于单一PEC和EF体系，其降解效率和瞬时电流效率分别比单一PEC和EF体系提高了154%和26%.这些显著的增强可以归因于光阳极中光生载流子的更好分离以及光电子向氧扩散阴极的转移以在芬顿阴极上产生更多的电生H2 O2和羟基自由基的协同效应。在PEC/EF过程中，光生载流子的更好分离比光电子产生的H2 O2和随后阴极上的芬顿反应对整体降解增强的贡献更大。
In this study, we report on a photo-electrochemical/electro-Fenton oxidation (PEC/EF) system by coupling visible light driven photo-electrochemical oxidation (PEC) and electro-Fenton oxidation (EF) in an undivided cell. Bi2WO6nanoplates deposited on FTO glass (Bi2WO6/FTO) and Fe@Fe2O3core–shell nanowires supported on activated carbon fiber (Fe@Fe2O3/ACF) were used as the anode and the cathode in the PEC/EF system, respectively. This novel PEC/EF system showed much higher activity than the single PEC and EF systems on degradation of rhodamine B in aqueous solution at natural pH. Moreover, the degradation and the instantaneous current efficiencies of the PEC/EF system were increased by 154% and 26% in comparison with the sum of those of single PEC and EF systems, respectively. These significant enhancements could be attributed to the synergetic effect from better separation of photo-generated carriers in the photo-anode and the transfer of photo-electrons to the oxygen diffusion cathode to generate more electro-generated H2O2and hydroxyl radicals on the Fenton cathode. The better separation of photo-generated carriers contribute more to the overall degradation enhancement than the photo-electrons generated H2O2and the subsequent Fenton reaction on the cathode during the PEC/EF process.