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1.中国科学院高能物理研究所 纳米生物效应与安全性院重点实验室 北京 100049
2.中国科学院大学 北京 100049
3.安徽大学 健康科学研究院 合肥 230601
4.中国科学院高能物理研究所 北京同步辐射装置 北京 100049
Received:01 December 2017,
Revised:30 January 2018,
Published:10 May 2018
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Dan ZHANG, Bing WANG, Shanshan LIANG, et al. Heterogeneous catalytic reaction of SO2 on the surface of ultrafine Fe3O4 particle by XANES[J]. Nuclear techniques, 2018, 41(5): 050101
Dan ZHANG, Bing WANG, Shanshan LIANG, et al. Heterogeneous catalytic reaction of SO2 on the surface of ultrafine Fe3O4 particle by XANES[J]. Nuclear techniques, 2018, 41(5): 050101 DOI: 10.11889/j.0253-3219.2018.hjs.41.050101.
超细颗粒物为大气中痕量气态污染物转化提供了广泛的反应界面,在其表面发生多相界面反应是大气二次颗粒物形成的主要途径。含铁超细颗粒是大气气溶胶的主要成分之一。本研究采用同步辐射X射线近边吸收谱(X-ray Absorption Near Edge Structure,XANES)技术开展了Fe
3
O
4
超细颗粒表面的多相反应研究,分析了反应时间、紫外照射及臭氧存在条件对二次颗粒物形成的影响。研究发现:SO
2
在Fe
3
O
4
超细颗粒表面能被快速氧化形成硫酸根(SO
4
2-
),其中紫外光照(Ultra-Violet,UV)和O
3
可以促进硫酸根的生成。从反应时间上看,SO
2
在Fe
3
O
4
超细颗粒表面可快速反应生成高价态硫酸根,30 min时,约99%的硫化物转化成硫酸根。通过对S的XANES谱进行一阶导数处理,发现产物中还存在亚硫酸根(SO
3
2-
)的峰,提示SO
2
在Fe
3
O
4
颗粒物表面可先生成亚硫酸根,进而被快速氧化成硫酸根。
Background
2
Ultrafine particles (UFPs) may provide various micro-locations of heterogeneous chemical reactions of trace of gaseous substances in atmospheric environment. Iron-containing UFPs are the main components of atmospheric aerosol.
Purpose
2
This study aims to investigate heterogeneous reactions of SO
2
on Fe
3
O
4
UFPs.
Methods
2
S K-edge of products was investigated by synchrotron radiation X-ray absorption near edge structure (XANES).
Results
2
The results indicated that SO
2
could be rapidly oxidized to form sulfate on the surface of Fe
3
O
4
. Formation of sulfate can be promoted under the UV and O
3
conditions.
Conclusion
2
The formation of adsorbed sulfate likely involves the formation of pre-absorbed sulfite (SO
3
2-
) and subsequent oxidation.
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