Uptake of gaseous hydrogen peroxide by submicrometer titanium dioxide aerosol as a function of relative humidity

Environmental Science & Technology
Manik PradhanRichard M Lambert

Abstract

Hydrogen peroxide (H(2)O(2)) is an important atmospheric oxidant that can serve as a sensitive indicator for HO(x) (OH + HO(2)) chemistry. We report the first direct experimental determination of the uptake coefficient for the heterogeneous reaction of gas-phase hydrogen peroxide (H(2)O(2)) with titanium dioxide (TiO(2)), an important component of atmospheric mineral dust aerosol particles. The kinetics of H(2)O(2) uptake on TiO(2) surfaces were investigated using an entrained aerosol flow tube (AFT) coupled with a chemical ionization mass spectrometer (CIMS). Uptake coefficients (gamma(H(2)O(2))) were measured as a function of relative humidity (RH) and ranged from 1.53 x 10(-3) at 15% RH to 5.04 x 10(-4) at 70% RH. The observed negative correlation of RH with gamma(H(2)O(2)) suggests that gaseous water competes with gaseous H(2)O(2) for adsorption sites on the TiO(2) surface. These results imply that water vapor plays a major role in the heterogeneous loss of H(2)O(2) to submicrometer TiO(2) aerosol. The results are compared with related experimental observations and assessed in terms of their potential impact on atmospheric modeling studies of mineral dust and its effect on the heterogeneous chemistry in the atmosphere.

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Citations

Oct 24, 2012·Chemical Reviews·Haihan ChenVicki H Grassian
Mar 13, 2016·Journal of Environmental Sciences (China)·Li ZhouShengrui Tong
May 8, 2014·Physical Chemistry Chemical Physics : PCCP·L RkiouakF D Pope
Dec 20, 2012·The Journal of Physical Chemistry. a·Yuri BedjanianAtallah El Zein
Jan 27, 2015·The Journal of Physical Chemistry. a·Leah G DodsonMitchio Okumura
Jul 19, 2012·The Journal of Physical Chemistry. a·Manolis N RomaniasYuri Bedjanian
Mar 17, 2015·Chemical Reviews·Christian GeorgeSergey A Nizkorodov
Dec 2, 2020·Environmental Science & Technology·Shan ZhouTara F Kahan
Dec 21, 2013·The Journal of Physical Chemistry. a·Atallah El ZeinYuri Bedjanian

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