Improving photoelectrochemical reduction of Cr(VI) ions by building α-Fe2O3/TiO2 electrode

被引：14
作者：
Wang, Pingping [1 ,2 ]
Dong, Faqin [1 ]
Liu, Mingxue [1 ]
He, Huichao [1 ]
Huo, Tingting [1 ,2 ]
Zhou, Lei [1 ,2 ]
Zhang, Wei [1 ,2 ]
机构：
[1] Southwest Univ Sci & Technol, Key Lab Solid Waste Treatment & Resource Recycle, Minist Educ, Mianyang 621010, Sichuan, Peoples R China
[2] Southwest Univ Sci & Technol, Sch Environm & Resource, Mianyang 621010, Sichuan, Peoples R China
来源：
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2018年 / 25卷 / 23期
关键词：
Hexavalent chromium; alpha-Fe2O3/TiO2; Photoelectrochemical reduction; Cr(VI) reduction; PHOTOCATALYTIC REDUCTION; ELECTROCHEMICAL REDUCTION; AQUEOUS-SOLUTION; SOL-GEL; REMOVAL; CHROMIUM; CR(III); NANOCOMPOSITES; DETOXIFICATION; DEGRADATION;
D O I：
10.1007/s11356-018-1382-y
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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, alpha-Fe2O3/TiO2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate alpha-Fe2O3 and TiO2 electrodes, the composite alpha-Fe2O3/TiO2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite alpha-Fe2O3/TiO2 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.
引用
收藏
页码：22455 / 22463
页数：9
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