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.

• Periodical: Advanced Materials Research (Volume 1085)
• Pages: 119-123
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1085.119
• Online since: February 2015
• Authors: Elena B. Daibova, Tamara S. Minakova, Valeriy S. Zakharenko, Natalia Kosova, Irina A. Kurzina, Alla B. Zotova
• Keywords: Acid-Base Properties of Surface, Aerosol Particles, Brucite, Freon 22, Magnesite, Magnesium Oxide, Magnesium-Containing Minerals, Periclase, Photosorption, Troposphere

References

[1] V.S. Zakharenko, E.B. Daibova, Photochemical activity of precipitated aerosol obtained from mineral crystal of periclase (MgO) in conditions of surrounding air, Optics of Atmosph, Ocean. 24 (2011) 516 - 520.

[2] Ivlev L.C. Heterogenous chemistry of the low atmosphere, Physics and Chemistry of atmosphere Aerosols. 20 (1997) 54-80.

[3] V.S. Zakharenko, Photoinduced heterogeneous processes on phase chemical components of solid troposphetic aerosols, Topics in Catalysis. 35 (2005) 231-236.

DOI: 10.1007/s11244-005-3829-x

[4] Nechiporenko A.P. Donor-acceptor properties of oxides and chalcogenides: abstract of a thesis doctor of chemical science, Saint Petersburg, (1995).

[5] T.S. Minakova Adsorption processes on the surface of solid substances, Publisher's House of Tomsk State University, Tomsk, (2007).

[6] T.S. Minakova, М.М. Sychov, V.V. Bakhmetyev, N.S. Ereminа, S.P. Bogdanov, I.A. Zyatikov, L. Yu. Minakova, The Influence of Zn3(PO4)2: Mn –Luminophore Synthesis Conditions on their Surface and Luminescent Features. Adv. Mater. Res. 872 (2014).

DOI: 10.4028/www.scientific.net/amr.872.106

[7] Е.А. Pauckshtis IR-spectroscopy in heterogeneous acid-base catalysis, Science, Novosibirsk, (1992).

[8] E.B. Daibova, T.S. Minakova. Acid-base state of the surface of titanium dioxide and magnesium oxide powdered samples, Bull. of Instit. of hHigher Education. Physics. (Izvestya vuzov: Fizika in Russian). 54 (2011) 27-30.

[9] Goto A., Aika K. Surface species produced by the reaction between methane and oxygen radical anion O- on MgO at 298 K. Bull. of Chem. Soc. Japan. 71 (1998) 95-98.

DOI: 10.1246/bcsj.71.95

[10] E.B. Daibova, Sorption and photosorption processes on the surface of some oxides and magnesium containing minerals. Abstract of PhD's Thesis (in Russian), Tomsk, (2013).