用XANES方法研究SO2在超细Fe3O4颗粒表面的非均相反应

张丹; 汪冰; 梁姗姗; 郑雷; 丰伟悦

doi:10.11889/j.0253-3219.2018.hjs.41.050101

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用XANES方法研究SO₂在超细Fe₃O₄颗粒表面的非均相反应

同步辐射技术及应用 | 更新时间：2021-05-19

- 用XANES方法研究SO₂在超细Fe₃O₄颗粒表面的非均相反应
- Heterogeneous catalytic reaction of SO₂ on the surface of ultrafine Fe₃O₄ particle by XANES
- 核技术 2018年41卷第5期文章编号：050101
- 作者机构：
  
  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
- 作者简介：
  
  [ "张丹, 女, 1991年出生, 2013年毕业于北京师范大学, 现为硕士研究生, 主要从事纳米材料表面反应机理研究", "ZHANG Dan, female, born in 1991, graduated from Beijing Normal University in 2013, master student, focusing on study of mechanism of reactions on the surface of nano-materials" ]
  汪冰, E-mail:wangbing@ihep.ac.cn WANG Bing, E-mail:wangbing@ihep.ac.cn
  丰伟悦, E-mail:fengwy@ihep.ac.cn FENG Weiyue, E-mail:fengwy@ihep.ac.cn
- 基金信息：
  
  国家自然科学基金联合基金重点支持项目(U1432245);国家自然科学基金(11475195);国家自然科学基金(91543118)
- DOI：10.11889/j.0253-3219.2018.hjs.41.050101
  中图分类号： TL99;O434.1;O433.51;X513
- 收稿日期：2017-12-01，
  
  修回日期：2018-01-30，
  
  纸质出版日期：2018-05-10
- 稿件说明：
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张丹, 汪冰, 梁姗姗, 等. 用XANES方法研究SO₂在超细Fe₃O₄颗粒表面的非均相反应[J]. 核技术, 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
张丹, 汪冰, 梁姗姗, 等. 用XANES方法研究SO₂在超细Fe₃O₄颗粒表面的非均相反应[J]. 核技术, 2018,41(5):050101 DOI： 10.11889/j.0253-3219.2018.hjs.41.050101.

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.

摘要

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

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

在Fe

超细颗粒表面能被快速氧化形成硫酸根（SO

），其中紫外光照（Ultra-Violet，UV）和O

可以促进硫酸根的生成。从反应时间上看，SO

在Fe

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

）的峰，提示SO

在Fe

颗粒物表面可先生成亚硫酸根，进而被快速氧化成硫酸根。

Abstract

Background

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

This study aims to investigate heterogeneous reactions of SO

on Fe

UFPs.

Methods

S K-edge of products was investigated by synchrotron radiation X-ray absorption near edge structure (XANES).

Results

The results indicated that SO

could be rapidly oxidized to form sulfate on the surface of Fe

. Formation of sulfate can be promoted under the UV and O

conditions.

Conclusion

The formation of adsorbed sulfate likely involves the formation of pre-absorbed sulfite (SO

) and subsequent oxidation.

关键词

Keywords

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