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Perovskite LaFeO3-SrTiO3 composite for synergistically enhanced NO removal under visible light excitation
Zhang, Qian1,2; Huang, Yu1,2; Peng, Shiqi1; Zhang, Yufei1; Shen, Zhenxing3; Cao, Jun-ji1,2; Ho, Wingkei4; Lee, Shun Cheng5; Pui, David Y. H.6
2017-05-05
发表期刊APPLIED CATALYSIS B-ENVIRONMENTAL
卷号204期号:2017页码:346-357
文章类型Article
摘要Perovskite oxides (ABO(3)) are widely studied as excellent sorbing and catalytic materials for NOx abatement in automobile or stationary depollution processes, and recently they have attracted significant interest in solar conversion reactions due to the flexible composition, facile optical and electronic tuning properties. In this work, perovskite LaFeO3 microspheres were synthesized and employed as photo catalysts to remove parts-per-billion level NO, and it is found that the photocatalytic efficiency was dramatically improved by coupling with SrTiO3 nanocubes. The LaFeO3-SrTiO3 composite with proper mass ratio (0.3-1) displayed 3.1 and 4.5 fold enhancement in NO removal rate as compared to the pristine LaFeO3 and SrTiO3, respectively. Moreover, the LaFeO3-SrTiO3 composite exhibited decreased NO2 yield possibly due to the basic surface property of strontium sites. The synergistically improved activity was due to broad visible light harvest, enlarged surface area, and most importantly, the depressed surface charge recombination originating from the perfectly matched LaFeO3-SrTiO3 interface and facile charge transfer along the staggered band alignment. The temperature programmed desorption (TPD) analysis revealed that the composite had efficient chemisorption for NO. Further, the electron spin resonance (ESR) combined with the radical scavenger tests and density functional theory (DFT) calculations suggested that the photocatalytic NO oxidation via superoxide radicals (O-center dot(2)-) from SrTiO3 and direct hole (h(+)) transfer from LaFeO3 might be the predominant routes. We believe that this study provides some new insights into perovskite nanomaterials as photocatalyst for NOx abatement under ambient conditions. (C) 2016 Elsevier B.V. All rights reserved.
关键词Photocatalysis Nox Removal Perovskite Nanomaterials Srtio3 Lafeo3
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apcatb.2016.11.052
关键词[WOS]PHOTOCATALYTIC ACTIVITY ; HYDROTHERMAL SYNTHESIS ; TIO2 ; ABATEMENT ; LAFEO3 ; MICROSPHERES ; PERFORMANCE ; POLLUTION ; BEHAVIOR ; OXIDES
收录类别SCI
语种英语
WOS研究方向Chemistry ; Engineering
WOS类目Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
WOS记录号WOS:000392681000034
引用统计
被引频次:37[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5539
专题粉尘与环境研究室
作者单位1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China
4.Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China
5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China
6.Univ Minnesota, Coll Sci & Engn, Dept Mech Engn, Minneapolis, MN 55455 USA
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Zhang, Qian,Huang, Yu,Peng, Shiqi,et al. Perovskite LaFeO3-SrTiO3 composite for synergistically enhanced NO removal under visible light excitation[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,204(2017):346-357.
APA Zhang, Qian.,Huang, Yu.,Peng, Shiqi.,Zhang, Yufei.,Shen, Zhenxing.,...&Pui, David Y. H..(2017).Perovskite LaFeO3-SrTiO3 composite for synergistically enhanced NO removal under visible light excitation.APPLIED CATALYSIS B-ENVIRONMENTAL,204(2017),346-357.
MLA Zhang, Qian,et al."Perovskite LaFeO3-SrTiO3 composite for synergistically enhanced NO removal under visible light excitation".APPLIED CATALYSIS B-ENVIRONMENTAL 204.2017(2017):346-357.
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