Fabrication of MnO2/TiO2 nano-tube arrays photoelectrode and its enhanced visible light photoelectrocatalytic performance and mechanism
文献类型： 外文期刊
作者： Ma, Qiuling 1 ; Wang, Haitao 2 ; Zhang, Huixuan 1 ; Cheng, Xiuwen 1 ; Xie, Mingzheng 1 ; Cheng, Qingfeng 3 ;
作者机构： 1.Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Environm Pollut Predict & Control Gansu P, Key Lab Western Chinas Environm Syst,Minist Educ, Lanzhou 730000, Peoples R China
2.Chinese Acad Fishery Sci, Heilongjiang River Fishery Res Inst, Harbin 150070, Peoples R China
3.Chengdu Univ Informat Technol, Coll Resources & Environm, Chengdu 610225, Sichuan, Peoples R China
4.Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Collaborat Innovat Ctr Atmospher Environm & Equip, Jiangsu Engn Tec
关键词： MnO2/TiO2 nano-tube arrays;Photoelectrode;Photoelectrocatalysis;Methyl orange
期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：7.312； 五年影响因子：6.656 ）
ISSN： 1383-5866
年卷期： 2017 年 189 卷
页码：
收录情况： SCI
摘要： MnO2/TiO2 nano-tube arrays (MnO2/TiO2 NTAs) photoelectrode was synthesized through anodization and electrodeposition, followed by the prepared conditions optimized. Subsequently, structures of the as-prepared photoelectrodes were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Besides, the light absorption capacities and photoelectrochemical (PECH) properties were investigated through UV vis diffuse reflectance spectrophotometer (UV vis DRS), photocurrent response (PCR) and electrochemical impedance spectroscopy (EIS). In addition, these photoelectrodes were used for the photoelectrocatalytic (PEC) degradation of methylene orange (MO) under Xenon lamp irradiation. Moreover, the enhanced PEG mechanism was further confirmed through scavengering effect and photoluminsecence (PL) spectra. Results presented that the highly ordered TiO2 nano-tube arrays photoelectrodes processed a uniform sizes of inner diameter of 300 nm and well thickness of 60 nm with MnO2 nanoparticles successfully deposited. Furthermore, it was found that these novel MnO2/TiO2 NTAs photoelectrodes could not only red-shift the light absorption to visible region between 400 nm and 700 nm, but also significantly enhance the generation of hydroxyl radicals COH) which played an important role in the PEC system. Noticeably, the MnO2/TiO2 NTAs photoelectrodes made in the optimized conditions exhibited much higher PEC activity toward MO degradation with the efficiency up to 95.2% within 1 h when external potential ( + 2.0 V) was applied. More importantly, these novel MnO2/TiO2 NTAs photoelectrodes proved to have excellent stability and reusability that would have great potentials for organic contaminants degradation in wastewater treatment.
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