Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China.
School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China.
Environ Sci Pollut Res Int. 2018 Aug;25(23):22455-22463. doi: 10.1007/s11356-018-1382-y. Epub 2018 Feb 19.
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-FeO/TiO were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-FeO and TiO electrodes, the composite α-FeO/TiO electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-FeO/TiO electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
光电化学过程是一种环保技术，在环境污染物控制方面有广泛的应用。高效的可见光响应纳米光催化剂仍然极具吸引力。在这项工作中，采用水热法在掺氟氧化锡（FTO）基底上生长α-FeO/TiO，用于光电化学还原 Cr(VI)。与单独的α-FeO 和 TiO 电极相比，复合α-FeO/TiO 电极表现出更高的光电流密度。在可见光照射下，经过 40 min 处理，Cr(VI)的去除率达到 100%。复合α-FeO/TiO 电极在可见光区显示出增强的吸光度，并且对 Cr(VI)的光电化学还原具有良好的稳定性。系统研究了空穴捕获剂（柠檬酸和草酸）和 pH 值的作用。这种新颖的强化方法为光电化学还原在环境修复中的应用提供了新的见解。
