Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

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	Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets
	Wu, Hongmin ; Ma, Jinzhu ; Li, Yaobin ; Zhang, Changbin ; He, Hong
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2014
卷号	152 期号:1 页码:82-87
关键词	Photocatalysis NH3 Fluorination TiO2 Indoor air quality
ISSN号	0926-3373
中文摘要	A surface-fluorinated TiO2 (F-TiO2) catalyst was synthesized by a hydrothermal method using hydrofluoric acid (FIF) solution as a capping agent, and defluorinated TiO2 (D-TiO2) was next obtained by washing the F-TiO2 with NaOH solution. The as-prepared catalysts were tested for the photocatalytic oxidation (PCO) of gaseous NH3 under UV light. The F-TiO2 catalyst exhibited remarkable activity for NH3 removal, about twice as high as that of the commercial catalyst P25. In contrast, D-TiO2 showed an obvious decrease in PCO activity. The catalysts were characterized by X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) adsorption analysis, High-resolution Transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the surface fluorination process formed the surface equivalent to Ti-F group and also increased the percentage of reactive (0 0 1) facets to about 50%; the surface defluorination removed the fluorine (F) element from the F-TiO2 surface but showed no influence on the percentage of reactive (0 0 1) facets. By comparing the specific activities of the catalysts, we found that both the active (0 0 1) facets and the surface group contributed to the improvement of the PCO activity, while the surface equivalent to Ti-F group plays the dominant role. The equivalent to Ti-F group could retard the recombination of photogenerated electrons and holes, which is possibly the major reason for the excellent activity of the F-TiO2 catalyst. (c) 2014 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000334481800011
公开日期	2015-03-23
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/9206]
专题	生态环境研究中心_城市与区域生态国家重点实验室生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Wu, Hongmin,Ma, Jinzhu,Li, Yaobin,et al. Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2014,152(1):82-87.
APA	Wu, Hongmin,Ma, Jinzhu,Li, Yaobin,Zhang, Changbin,&He, Hong.(2014).Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets.APPLIED CATALYSIS B-ENVIRONMENTAL,152(1),82-87.
MLA	Wu, Hongmin,et al."Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets".APPLIED CATALYSIS B-ENVIRONMENTAL 152.1(2014):82-87.