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Defect Chemistry of Er3+-Doped TiO2 and Its Photocatalytic Activity for the Degradation of Flowing Gas-Phase VOCs
Rao, Zepeng; Xie, Xiaofeng; Wang, Xiao; Mahmood, Asad; Tong, Shengrui; Ge, Maofa; Sun, Jing
2019-05-16
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
Volume123Issue:19Pages:12321
SubtypeArticle
AbstractA series of Er-doped TiO2 photocatalysts, using Er(NO3)(3)center dot 6H(2)O precursor ranging from 0.5 to 2 mol %, were synthesized via sol-gel method with titanium(W) isopropoxide solution as reactant. The structure and properties of as prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy, thermogravimetric analysis, photoluminescence, electrochemical impedance spectroscopy, and photocurrent. The as-synthesized Er-doped TiO2 nanoparticles demonstrated improved photocatalytic activities for the photodegradation of selected volatile organic compounds, including acetaldehyde, o-xylene, and ethylene. Additionally, high photodegradation of acetaldehyde was recorded in the visible region (lambda > 420 nm). XPS analysis revealed that a handful of Er in anatase TiO2 was presented in the form of Er2O3, which benefited by increasing the specific surface area ranging from 59.28 to 110.34 m(2)/g and consequently enhanced the adsorption capacity for acetaldehyde, o-xylene, and ethylene 3.3, 3.7, and 3.8 times, respectively, in contrast to the undoped TiO2. Electron spin resonance results showed that Er doping caused production of oxygen vacancies (V-O) and Ti3+, which promoted the photocatalytic activity of the catalyst. The TiO2 samples containing 0.5-1.5% Er content exhibited higher photoactivity in comparison with other samples. The highest removal efficiency of acetaldehyde and o-xylene within 100 min was 99.2 and 84.6%, respectively, and ethylene degradation efficiency reached 22.4% within 180 min. Furthermore, the visible light elimination efficiency of acetaldehyde was 25.5%. Finally, the results suggested that Er doping predominantly inhibited the catalyst poisoning in the degradation of o-xylene.
DOI10.1021/acs.jpcc.9b02093
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27111
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Rao, Zepeng,Xie, Xiaofeng,Wang, Xiao,et al. Defect Chemistry of Er3+-Doped TiO2 and Its Photocatalytic Activity for the Degradation of Flowing Gas-Phase VOCs[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2019,123(19):12321.
APA Rao, Zepeng.,Xie, Xiaofeng.,Wang, Xiao.,Mahmood, Asad.,Tong, Shengrui.,...&Sun, Jing.(2019).Defect Chemistry of Er3+-Doped TiO2 and Its Photocatalytic Activity for the Degradation of Flowing Gas-Phase VOCs.JOURNAL OF PHYSICAL CHEMISTRY C,123(19),12321.
MLA Rao, Zepeng,et al."Defect Chemistry of Er3+-Doped TiO2 and Its Photocatalytic Activity for the Degradation of Flowing Gas-Phase VOCs".JOURNAL OF PHYSICAL CHEMISTRY C 123.19(2019):12321.
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