Ye Jinghong, Xu He, Kong Xianghai, Zhang Yong, Chen Yuhan, Zhou Benji, Zhu Yanping, Cai Dongqing, Wang Dongfang
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, People's Republic of China.
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, People's Republic of China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People's Republic of China.
J Environ Manage. 2024 Aug;365:121608. doi: 10.1016/j.jenvman.2024.121608. Epub 2024 Jun 28.
In this work, a novel double-chamber system (PFC-Fenton), combined photocatalytic fuel cell (PFC) with Fenton, was constructed for tetracycline hydrochloride (TCH) and hexavalent chromium (Cr(VI)) removal and electricity production. Therein, Zn(OH)(CO)/FeO/BiVO/fluorine-doped SnO (ZIO/BiVO/FTO) and carboxylated carbon nanotubes/polypyrrole/graphite felt (CCNTs/Ppy/GF) were served as photoanode and cathode, respectively. Under light irradiation, the removal efficiencies of TCH and Cr(VI) with the addition of HO (2 mL) could reach 93.1% and 80.4%, respectively. Moreover, the first-order kinetic constants (7.37 × 10 min of TCH and 3.94 × 10 min of Cr(VI)) were 5.26 and 5.57 times as much as the absence of HO. Simultaneously, the maximum power density could be obtained 0.022 mW/cm at a current density of 0.353 mA/cm. Therein, the main contribution of TCH degradation was ·OH and holes in anode chamber. The synergistic effect of photoelectrons, generated ·O, and HO played a crucial role in the reduction of Cr(VI) in cathode chamber. The high-performance liquid chromatography-mass spectrometry indicated that TCH could be partially mineralized into CO and HO. X-ray photoelectron spectroscope and X-ray absorption near-edge structure spectra showed that Cr(VI) could be reduced to Cr(III). After 5 times of cycling, the removal efficiencies of TCH and Cr(VI) were still greater than 70%, indicating the remarkable stability of the PFC-Fenton system. Overall, this system could remove TCH/Cr(VI) and generate power simultaneously without iron sludge formation, demonstrating a promising method to further develop PFC-Fenton technology.
在本研究中，构建了一种新型双室系统（PFC - Fenton），将光催化燃料电池（PFC）与Fenton法相结合，用于去除盐酸四环素（TCH）和六价铬（Cr(VI)）并产生电能。其中，Zn(OH)(CO)/FeO/BiVO/氟掺杂氧化锡（ZIO/BiVO/FTO）和羧基化碳纳米管/聚吡咯/石墨毡（CCNTs/Ppy/GF）分别用作光阳极和阴极。在光照下，添加HO（2 mL）时TCH和Cr(VI)的去除效率分别可达93.1%和80.4%。此外，一级动力学常数（TCH为7.37×10 min，Cr(VI)为3.94×10 min）分别是不添加HO时的5.26倍和5.57倍。同时，在电流密度为0.353 mA/cm时可获得最大功率密度0.022 mW/cm。其中，阳极室中·OH和空穴对TCH降解起主要作用。光电子、生成的·O和HO的协同作用在阴极室中Cr(VI)的还原过程中起关键作用。高效液相色谱 - 质谱表明TCH可部分矿化为CO和HO。X射线光电子能谱和X射线吸收近边结构光谱表明Cr(VI)可还原为Cr(III)。经过5次循环后，TCH和Cr(VI)的去除效率仍大于70%，表明PFC - Fenton系统具有显著的稳定性。总体而言，该系统可同时去除TCH/Cr(VI)并产生电能，且不会形成铁污泥，为进一步发展PFC - Fenton技术提供了一种有前景的方法。
