Enhanced organic pollutants degradation and electricity production simultaneously via strengthening the radicals reaction in a novel Fenton-photocatalytic fuel cell system
Enhanced organic pollutants degradation and electricity production simultaneously via strengthening the radicals reaction in a novel Fenton-photocatalytic fuel cell system
复制标题
通过加强新型芬顿光催化燃料电池系统中的自由基反应，同时增强有机污染物降解和发电
DOI：
10.1016/j.watres.2016.11.002
复制
发表时间：
2017
期刊：
影响因子：
12.8
通讯作者：
Zhou Baoxue
中科院分区：
文献类型：
--
作者：
Zhao Kai;Zeng Qingyi;Bai Jing;Li Jinhua;Xia Ligang;Chen Shuai;Zhou Baoxue
通过建立一种新型的Fenton-光催化燃料电池(Fenton-PFC)系统，设计了纳米管阵列(TNA)作为光阳极，并加入亚铁离子，从而提高了有机污染物的降解和同时发电的效果。提出的Fenton-PFC体系可以将降解有机污染物的自由基反应从电极表面扩展到整个溶液体系，这是因为光电Fenton反应是连续的，而不需要不断地添加任何外部电压和亚铁离子。研究了亚铁离子(Fe~(2+)/Fe~(3+))与自由基及相关物种(HO点、O2点、O2-−点、H_2O_2等)的环化反应。可以通过PFC产生的自偏置电压在电极表面实现。更重要的是，所提出的Fenton-PFC系统几乎没有任何污泥，这是因为使用了少量的亚铁离子进行了有效的自由基反应。运行60min后，甲基橙、亚甲基蓝、刚果红和四环素等难降解有机物的降解率分别从传统无Fe2+PFC的34.99%、43.75%、40.58%和34.40%提高到97.34%、95.36%、93.23%和73.80%(Fe2+内的Fenton-PFC)。同时，发电量是传统PFC的1.21-2.04倍。提出的Fenton-PFC系统为能源回收和废水处理提供了一种更经济、更有效的方式。
An enhanced result in organic pollutants degradation and simultaneous electricity production has been achieved by establishing a novel Fenton-photocatalytic fuel cell (Fenton-PFC) system in which TiO2nanotube arrays (TNA) was designed as a photoanode and ferrous ions were added. The proposed Fenton-PFC system can expand the radical reaction for organic pollutants degradation from the surface of electrodes to the whole solution system due to a continuous photoelectric Fenton reaction without continually adding any external voltage and ferrous ions. The cyclic reactions between ferrous ions (Fe2+/Fe3+) and radicals and related species (HOradical dot, HO2radical dot, O2−radical dot and H2O2etc.) can be achieved at electrodes surface via a self-bias voltage yielded by the PFC. More importantly, the proposed Fenton-PFC system has hardly any sludge due to an effective radical reaction using a small amount of ferrous ions. The degradation rate of refractory organics, such as methyl orange, methylene blue, congo red and tetracycline, increased from 34.99%, 43.75%, 40.58% and 34.40% (the traditional PFC without Fe2+) to 97.34%, 95.36%, 93.23% and 73.80% (the Fenton-PFC within Fe2+) respectively after 60 min operation. Meanwhile, the electricity generation is up to 1.21–2.04 times larger than the traditional PFC. The proposed Fenton-PFC system provides a more economical and efficient way for energy recovery and wastewater treatment.