Influence of relative humidity on SO                         2                          oxidation by O                         3                          and NO                         2                          on the surface of TiO                         2                          particles: Potential for formation of secondary sulfate aerosol

Xiang He; Yun Hong Zhang

doi:10.1016/j.saa.2019.04.046

Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol

Xiang He
, Yun Hong Zhang^*

^*此作品的通讯作者

化学与化工学院

Xinjiang University
Beijing Institute of Technology

科研成果: 期刊稿件 › 文章 › 同行评审

21 引用（Scopus）

摘要

The heterogeneous reactions of SO ₂ /O ₃ and SO ₂ /NO ₂ with TiO ₂ particles were studied as a function of relative humidities (RHs). An in situ microscopic Fourier transform infrared (micro-FTIR) spectrometer was used to monitor the reaction kinetics. Rapid conversion of SO ₂ to sulfate occurs on the surface of TiO ₂ particles in the presence of O ₃ or NO ₂ , which is sensitive to RHs. For unreacted (fresh) particles, the uptake coefficients for SO ₂ in initial stage are both obviously enhanced over four times with the increasing RH from ~4% to ~85%. Moreover, the uptake coefficient in the system of SO ₂ /O ₃ is about 40% higher than that of SO ₂ /NO ₂ on TiO ₂ particles at the similar RH conditions. For TiO ₂ after exposure to SO ₂ /O ₃ or SO ₂ /NO ₂ (sulfated) particles, the uptake coefficients for SO ₂ in moisture absorption stage are all higher than that on fresh particles in initial stage at the similar RH, indicating rapid mixture gases adsorption with particle hygroscopic growth. The high production of the secondary sulfate for heterogeneous reaction of mixture gases on TiO ₂ surface from arid region to humid region provides new insights for better understanding the severe haze under the humid condition.

源语言	英语
页（从-至）	121-128
页数	8
期刊	Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
卷	219
DOI	https://doi.org/10.1016/j.saa.2019.04.046
出版状态	已出版 - 5 8月 2019

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10.1016/j.saa.2019.04.046

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He, X., & Zhang, Y. H. (2019). Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 219, 121-128. https://doi.org/10.1016/j.saa.2019.04.046

He, Xiang ; Zhang, Yun Hong. / Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles : Potential for formation of secondary sulfate aerosol. 在: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2019 ; 卷 219. 页码 121-128.

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title = "Influence of relative humidity on SO 2 oxidation by O 3 and NO 2 on the surface of TiO 2 particles: Potential for formation of secondary sulfate aerosol",

abstract = " The heterogeneous reactions of SO 2 /O 3 and SO 2 /NO 2 with TiO 2 particles were studied as a function of relative humidities (RHs). An in situ microscopic Fourier transform infrared (micro-FTIR) spectrometer was used to monitor the reaction kinetics. Rapid conversion of SO 2 to sulfate occurs on the surface of TiO 2 particles in the presence of O 3 or NO 2 , which is sensitive to RHs. For unreacted (fresh) particles, the uptake coefficients for SO 2 in initial stage are both obviously enhanced over four times with the increasing RH from \textasciitilde{}4\% to \textasciitilde{}85\%. Moreover, the uptake coefficient in the system of SO 2 /O 3 is about 40\% higher than that of SO 2 /NO 2 on TiO 2 particles at the similar RH conditions. For TiO 2 after exposure to SO 2 /O 3 or SO 2 /NO 2 (sulfated) particles, the uptake coefficients for SO 2 in moisture absorption stage are all higher than that on fresh particles in initial stage at the similar RH, indicating rapid mixture gases adsorption with particle hygroscopic growth. The high production of the secondary sulfate for heterogeneous reaction of mixture gases on TiO 2 surface from arid region to humid region provides new insights for better understanding the severe haze under the humid condition.",

keywords = "Micro-FTIR, Reaction kinetic, Relative humidity, Secondary sulfate aerosol",

author = "Xiang He and Zhang, \{Yun Hong\}",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = aug,

day = "5",

doi = "10.1016/j.saa.2019.04.046",

language = "English",

volume = "219",

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He, X & Zhang, YH 2019, 'Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol', Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 卷 219, 页码 121-128. https://doi.org/10.1016/j.saa.2019.04.046

Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol. / He, Xiang; Zhang, Yun Hong.
在: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 卷 219, 05.08.2019, 页码 121-128.

科研成果: 期刊稿件 › 文章 › 同行评审

TY - JOUR

T1 - Influence of relative humidity on SO 2 oxidation by O 3 and NO 2 on the surface of TiO 2 particles

T2 - Potential for formation of secondary sulfate aerosol

AU - He, Xiang

AU - Zhang, Yun Hong

PY - 2019/8/5

Y1 - 2019/8/5

N2 - The heterogeneous reactions of SO 2 /O 3 and SO 2 /NO 2 with TiO 2 particles were studied as a function of relative humidities (RHs). An in situ microscopic Fourier transform infrared (micro-FTIR) spectrometer was used to monitor the reaction kinetics. Rapid conversion of SO 2 to sulfate occurs on the surface of TiO 2 particles in the presence of O 3 or NO 2 , which is sensitive to RHs. For unreacted (fresh) particles, the uptake coefficients for SO 2 in initial stage are both obviously enhanced over four times with the increasing RH from ~4% to ~85%. Moreover, the uptake coefficient in the system of SO 2 /O 3 is about 40% higher than that of SO 2 /NO 2 on TiO 2 particles at the similar RH conditions. For TiO 2 after exposure to SO 2 /O 3 or SO 2 /NO 2 (sulfated) particles, the uptake coefficients for SO 2 in moisture absorption stage are all higher than that on fresh particles in initial stage at the similar RH, indicating rapid mixture gases adsorption with particle hygroscopic growth. The high production of the secondary sulfate for heterogeneous reaction of mixture gases on TiO 2 surface from arid region to humid region provides new insights for better understanding the severe haze under the humid condition.

AB - The heterogeneous reactions of SO 2 /O 3 and SO 2 /NO 2 with TiO 2 particles were studied as a function of relative humidities (RHs). An in situ microscopic Fourier transform infrared (micro-FTIR) spectrometer was used to monitor the reaction kinetics. Rapid conversion of SO 2 to sulfate occurs on the surface of TiO 2 particles in the presence of O 3 or NO 2 , which is sensitive to RHs. For unreacted (fresh) particles, the uptake coefficients for SO 2 in initial stage are both obviously enhanced over four times with the increasing RH from ~4% to ~85%. Moreover, the uptake coefficient in the system of SO 2 /O 3 is about 40% higher than that of SO 2 /NO 2 on TiO 2 particles at the similar RH conditions. For TiO 2 after exposure to SO 2 /O 3 or SO 2 /NO 2 (sulfated) particles, the uptake coefficients for SO 2 in moisture absorption stage are all higher than that on fresh particles in initial stage at the similar RH, indicating rapid mixture gases adsorption with particle hygroscopic growth. The high production of the secondary sulfate for heterogeneous reaction of mixture gases on TiO 2 surface from arid region to humid region provides new insights for better understanding the severe haze under the humid condition.

KW - Micro-FTIR

KW - Reaction kinetic

KW - Relative humidity

KW - Secondary sulfate aerosol

UR - https://www.scopus.com/pages/publications/85064690740

U2 - 10.1016/j.saa.2019.04.046

DO - 10.1016/j.saa.2019.04.046

M3 - Article

C2 - 31030039

AN - SCOPUS:85064690740

SN - 1386-1425

VL - 219

SP - 121

EP - 128

JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

ER -

He X, Zhang YH. Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2019 8月 5;219:121-128. doi: 10.1016/j.saa.2019.04.046

Influence of relative humidity on SO 2 oxidation by O 3 and NO 2 on the surface of TiO 2 particles: Potential for formation of secondary sulfate aerosol

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Influence of relative humidity on SO ₂ oxidation by O ₃ and NO ₂ on the surface of TiO ₂ particles: Potential for formation of secondary sulfate aerosol