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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
Source PublicationAPPLIED CATALYSIS A-GENERAL
Volume515Issue:2016Pages:170-178
SubtypeArticle
AbstractSolar-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.
KeywordPorous Znwo4 Microsphere Nox Degradation Ultrasonic Spray Pyrolysis Electron Spin Resonance Spectroscopy (Esr) Photocatalysis
WOS HeadingsScience & Technology ; Physical Sciences ; Life Sciences & Biomedicine
DOI10.1016/j.apcata.2016.02.007
WOS KeywordELECTRONIC-STRUCTURES ; CRYSTAL-STRUCTURES ; SINGLE-CRYSTALS ; VISIBLE-LIGHT ; SURFACE-AREA ; INDOOR AIR ; CATALYSTS ; BAND ; FABRICATION ; ABATEMENT
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Environmental Sciences & Ecology
WOS SubjectChemistry, Physical ; Environmental Sciences
WOS IDWOS:000372679600020
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5740
Collection粉尘与环境研究室
Affiliation1.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
Recommended Citation
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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