Surface properties of aerosol microparticles of calcium and magnesium hydroxides under ambient air
V.S. Zakharenko1, E.B. Daibova2
1Boreskov Institute of Catalysis SB RAS, pr. Lavrentieva 5, Novosibirsk, Russia, 630090
2Siberian Research Institute of agriculture and peat Russian academy of agricultural sciences, 3 Gagarin str., Tomsk, Russia, 634050
Keywords: гидроксид кальция, гидроксид магния, микрочастицы, условия окружающей среды, состав поверхности, calcium hydroxide, magnesium hydroxide, microparticles, surface properties, ambient air conditions, surface composition
Abstract
The adsorption and photosorption properties of microparticles of Mg(OH)2 and Ca(OH)2 in ambient air are studied. The composition of adsorption layer of microparticles is analyzed. The kinetics of photodesorption of molecules from the microparticle surfaces and interaction of Freon 22 (CHF2Cl) with its surfaces in the dark and under illumination are studied. The effect of weakly-bound CO displacement from the microparticle surfaces is revealed during the Freon 22 dark adsorption. It is suggested that the adsorbed CO is formed in the result of atmospheric CO2 reduction after the break of Mg-OH bonds. Calcium hydroxide CO is generated during interaction of calcium hydroxide with carbon dioxide on the microparticle surfaces in the presence of water.
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