Heterogeneous Interaction of Various Natural Dust Samples with Isopropyl Alcohol as a Probe VOC

The Journal of Physical Chemistry. a
Mohamad N ZeineddineFrédéric Thévenet

Abstract

The adsorption properties of mineral dust toward organic molecules are poorly characterized so far. Heterogeneous processes between trace gases and mineral particles can affect the oxidative capacity of the atmosphere as well as constitute additional sources or sinks for these species. The current study investigates the adsorption efficiencies of natural dust samples collected from North and West Africa, Saudi Arabia, and Arizona desert regions toward isopropyl alcohol (IPA), a common organic pollutant released in significant amounts in the atmosphere, which is used here as a probe molecule. Experiments are performed under atmospheric pressure, room temperature 296 K, over the concentration range (0.15-615) × 1013 molecules cm-3, and in the relative humidity (RH) range (0.01-85)%. The kinetic measurements are conducted inside a U-shaped flow reactor using zero air as bath gas and a chemical ionization mass spectrometer for real-time gas-phase monitoring. Kinetic and surface parameters such as initial uptake coefficients (γ0) and adsorption equilibrium constants are measured. γ0 is found to be independent of the IPA gas-phase concentration. However, concerning RH, γ is independent up to ca. 20%, but a dramatic decrease is observ...Continue Reading

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Oct 17, 2015·The Journal of Physical Chemistry. a·Yuri BedjanianManolis N Romanias
Nov 2, 2016·Environmental Science & Technology·Manolis N RomaniasVeronique Riffault

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