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Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies
Huang, Yu1,2; Gao, Yunxia1; Zhang, Qian1; Cao, Jun-ji1,2; Huang, Ru-jin1,2; Ho, Wingkei3; Lee, Shun Cheng4
2016-04-10
发表期刊APPLIED CATALYSIS A-GENERAL
卷号515期号:2016页码:170-178
文章类型Article
摘要Solar-light-driven photocatalysts with porous structure are preferred for gaseous pollutants removal at low concentration levels. In this study, hierarchical porous ZnWO4 microspheres were synthesized by a facile ultrasonic spray pyrolysis method for the first time. The as-prepared ZnWO4 samples were composed of microspheres with diameter ranging from 0.1 to 2 pm and it was revealed that these micro spheres are formed by the self-assembly of nanoparticles. The photocatalytic performances of these microspheres were evaluated by the degradation of gaseous NOx under simulated solar light irradiation. It was found that the ZnWO4 batch synthesized at 700 degrees C exhibited superior photocatalytic activity to those synthesized at 650 degrees C and 750 degrees C as well as Degussa TiO2 P25. Both (center dot) OH and O-2(center dot-) radicals were found to be the major reactive species involved for NOx degradation as identified by electron spin resonance spectroscopy (ESR) method, which was consistent with the theoretical analysis. The excellent catalytic activity of ZWO-700 was attributed to its special hierarchical porous structure, which facilitated the separation/diffusion of the photogenerated charge carriers and the diffusion of intermediates and final products of NOx oxidation. The photocatalytic NOx removal mechanism over ZnWO4 samples was also proposed. This study suggests that ultrasonic spray pyrolysis is a facile and scalable process to fabricate ZnWO4 porous microspheres which are promising photocatalytic materials for gaseous pollutants purification. (C) 2016 Elsevier B.V. All rights reserved.
关键词Porous Znwo4 Microsphere Nox Degradation Ultrasonic Spray Pyrolysis Electron Spin Resonance Spectroscopy (Esr) Photocatalysis
WOS标题词Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine
DOI10.1016/j.apcata.2016.02.007
关键词[WOS]ELECTRONIC-STRUCTURES ; CRYSTAL-STRUCTURES ; SINGLE-CRYSTALS ; VISIBLE-LIGHT ; SURFACE-AREA ; INDOOR AIR ; CATALYSTS ; BAND ; FABRICATION ; ABATEMENT
收录类别SCI
语种英语
WOS研究方向Chemistry ; Environmental Sciences & Ecology
WOS类目Chemistry, Physical ; Environmental Sciences
WOS记录号WOS:000372679600020
引用统计
被引频次:20[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/361006/5740
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.Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China
4.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China
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GB/T 7714
Huang, Yu,Gao, Yunxia,Zhang, Qian,et al. Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies[J]. APPLIED CATALYSIS A-GENERAL,2016,515(2016):170-178.
APA Huang, Yu.,Gao, Yunxia.,Zhang, Qian.,Cao, Jun-ji.,Huang, Ru-jin.,...&Lee, Shun Cheng.(2016).Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies.APPLIED CATALYSIS A-GENERAL,515(2016),170-178.
MLA Huang, Yu,et al."Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies".APPLIED CATALYSIS A-GENERAL 515.2016(2016):170-178.
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