Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies

doi:10.1016/j.apcata.2016.02.007

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	Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NOx removal studies
	Lee, Shun Cheng 2; Gao, Yunxia 3; Huang, Yu 3,4; Ho, Wingkei 1; Huang, Ru-jin 3,4; Cao, Jun-ji 3,4; Zhang, Qian 3
刊名	APPLIED CATALYSIS A-GENERAL
	2016-04-10
卷号	515 期号:2016 页码:170-178
关键词	Porous Znwo4 Microsphere Nox Degradation Ultrasonic Spray Pyrolysis Electron Spin Resonance Spectroscopy (Esr) Photocatalysis
DOI	10.1016/j.apcata.2016.02.007
文献子类	Article
英文摘要	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.
WOS关键词	ELECTRONIC-STRUCTURES ; CRYSTAL-STRUCTURES ; SINGLE-CRYSTALS ; VISIBLE-LIGHT ; SURFACE-AREA ; INDOOR AIR ; CATALYSTS ; BAND ; FABRICATION ; ABATEMENT
WOS研究方向	Chemistry ; Environmental Sciences & Ecology
语种	英语
WOS记录号	WOS:000372679600020
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5740]
专题	地球环境研究所_粉尘与环境研究室
作者单位	1.Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China 2.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Lee, Shun Cheng,Gao, Yunxia,Huang, Yu,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	Lee, Shun Cheng.,Gao, Yunxia.,Huang, Yu.,Ho, Wingkei.,Huang, Ru-jin.,...&Zhang, Qian.(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	Lee, Shun Cheng,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.