Acid-Base and Photoinduced Processes on Magnesium-Containing Minerals and their Influence on the Troposphere Cleaning

Abstract

Acid-base, adsorption and photosorption properties of microparticles surface of magnesium-containing compounds produced by dispersion of natural minerals after exposure to the air were studied. It was revealed that the reduction in predominant basicity of minerals surface in a range of periclase (MgO), brucite (Mg (OH)2) and magnesite (MgCO3) can be considered as a result of the presence of iron, silicon and magnesium oxide compounds. Quantum-chemical calculations made during the investigation, the decrease of pressure in the process of long-term contact of Freon 22 with the surface of MgO, irreversible character of adsorption and the absence of fluorine and chlorine-containing products in a gaseous phase give evidence of CFC destructive adsorption on the surface of magnesium oxide. The interaction of chlorine and fluorine derivatives of methane with the surface of aerosol particles from minerals in the darkness and under the influence of sunlight tropospheric radiation was studied. The evaluation of such interactions influence on the process of the Earth troposphere purification from carbon dioxide and dichlorofluoromethane during their adsorption and photosorption on the surface of precipitated aerosol was made.

Physicochemical and Photosorption Properties of Oxygen-Containing Calcium Compounds – Components of Troposferic Aerosol

“…Such an enhancement can be explained by a higher photosorption activity of calcium oxide in this area of spectrum which is formed at the intermediate stage of calcium carbonate conversion into calcium fluoride and chloride. In this short waves area photo adsorption of oxygen from dried air on the samples of calcium carbonate (figure 3, curve 3) and also photosorption of oxygen on calcium oxide after its high temperature oxygen-vacuum treatment can be observed [9]. Carring out the analysis of Freon photosorption on the sample of calcium carbonate (calcite) the possibility of surface fluorides and chlorides formation was revealed [11].…”

“…The content of gases was determined with the help of monopolar mass-spectrometer. Temporary broach at the scanning mass spectra was estimated to be 10 s, and the average value made by three scans of mass-spectrum was recorded in the memory of electronic machine [2,9].…”