Photoelectrocatalytic Degradation of Refractory Organic Compounds Enhanced by a Photocatalytic Fuel Cell
Photoelectrocatalytic Degradation of Refractory Organic Compounds Enhanced by a Photocatalytic Fuel Cell
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DOI：
10.1016/j.apcatb.2011.10.038
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发表时间：
2012-01
影响因子：
22.1
通讯作者：
Yanbiao Liu;Jinhua Li;B. Zhou;Shubin Lv;Xuejin Li;Hongchong Chen;Quanpeng Chen;W. Cai
中科院分区：
文献类型：
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作者：
Yanbiao Liu;Jinhua Li;B. Zhou;Shubin Lv;Xuejin Li;Hongchong Chen;Quanpeng Chen;W. Cai
以高效降解难降解有机化合物为目的，建立了一种由光电催化反应器和光催化燃料电池（PFC）组成的新型复合光电催化体系。PFC是将有机“底物”进行光分解，同时将有机“底物”的化学能转化为电能的装置。在复合系统内，PFC产生的电能，而不是外部电源，被施加在光电催化反应器上作为电位偏压。研究了复合体系对有机化合物的降解性能及其影响因素。实验结果表明，PFC系统明显提高了光电催化反应器中有机化合物的去除效率。光电催化过程的动力学常数是纯光催化过程的约1.75倍。此外，光电催化反应器的性能随PFC阳极照明面积的增加而增加，随外接电阻和电解质浓度的增加而降低。PFC系统中底物的种类和浓度也是影响光电催化反应器中有机物去除率的关键因素。该复合系统为利用PFC系统产生的电能提供了一种新的途径，并在处理各种难降解有机污染物方面具有潜在的应用前景。
A novel composite photoelectrocatalytic system, composed of a photoelectrocatalytic reactor and a photocatalytic fuel cell (PFC), was established with the aim to efficiently degrade refractory organic compounds. The PFC is device, in which the organic “substrates” were photodecomposed and the chemical energy of organic “substrates” was converted into electrical energy simultaneously. Within the composite system, the electricity produced by PFC, rather than external power supply, was exerted on the photoelectrocatalytic reactor to serve as potential bias. The organic compound degradation performance and affecting factors of the composite system were also studied. The experimental results demonstrate that the removal efficiency of organic compound in the photoelectrocatalytic reactor was evidently enhanced by the PFC system. The kinetic constant of the photoelectrocatalytic process was found to be ∼1.75 times that of the pure photocatalytic process. Furthermore, the performance of the photoelectrocatalytic reactor was found to increase with the illumination area (of the anode) of PFC and decrease with the external resistor and electrolyte concentration. The category and concentration of the substrate in PFC system were also key factors influencing the efficiency of organic compound removal in the photoelectrocatalytic reactor. The composite system provides a novel way for utilizing of the electrical energy generated from the PFC system and has potential applications for the treatment of various refractory organic pollutants.