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

Abstract:

The Importance of this Paper is Determined by the Research of Conditions of Photosorption Processes Occurance on the Surface of Aerosol Particles Resulting in the Removal of Toxic Substances from the Atmosphere. Acid-Base Properties of Oxygen-Containing Calcium Compounds being Components of Troposphere Aerosol Particles were Studied by Methods of Ph-Metry and Hammet’s Indicators. the Basic Properties of the Investigated Compounds Surfaces are Predominant Ones: рН_iis of Calcium Oxide and Hydroxide has a Value of 9.3 – 9.5, and that for Carbonate and Calcite Equals to 12.3-12.4. Indicator Method Distinguishes Three Areas of Spectrum Corresponding to Lewis Base, and Brensted Neutral and Basic Centers. the Intencity of Peaks is much Higher for Ca(OH)₂ and CaO. the Interaction Process of Halogen-Containing Organic Compounds (Freons: 134a, 22 and 12) with Calcium Carbonate Surface under Illumination in Conditions close to Tropospheric Conditions was Studied. it is Shown that the Interaction is the Destructive Photosorption of Freons (134a or 22). the Spectral Dependence of Effective Quantum Yield of Destructive Photosorption is Determined. as a Result of the Interaction Calcium Fluoride and Calcium Chloride are Formed at the Surface.

• Periodical: Advanced Materials Research (Volume 1085)
• Pages: 124-129
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1085.124
• Online since: February 2015
• Authors: Elena B. Daibova, Tamara S. Minakova, Valeriy S. Zakharenko, Natalia Kosova, Irina A. Kurzina, Магina E. Kirillova, Ludmila Yu. Minakova
• Keywords: 134a, Acid-Base Properties of Surface, Adsorption, Aerosol Particles, Calcite, Calcium Oxide, Freon 22, Photosorption, Troposphere

References

[1] V.A. Isidorov Organic chemistry of the atmosphere, Chimisdat, SPb, (1992).

[2] V.N. Parmon, V.S. Zakharenko. Photocatalysis and photosorption in the earth atmosphere, Chemistry in the Interest of Stable Development (in Russian). 9, (2001) 461-483.

[3] V.S. Baryshev, N.S. Bufetov, K.P. Koutzenogii, V.I. Makarov, A.I. Smirnova. Synchrotron radiation measurements of the elemental composition of Siberian aerosols, Nucl. Instrum. and Meth. Phys. Res. A. 359 (1995) 297-301.

DOI: 10.1016/0168-9002(94)01370-5

[4] G.A. Kovalskaya. Element content of atmospheric aeroso; in mass units as a function of soil types undergone to wibd erosion, Optics of Atmosph. Ocean. 15 (2002) 506-510.

[5] 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

[6] T.S. Minakova. Adsorption processes on the surface of solid substances. Publishing House of Tomsk State University, Tomsk, (2007).

[7] E.B. Daibova, T.S. Minakova. Acid-base state of the surface of titanium dioxide and magnesium oxide powdered samples, Bull. of Instit. of High. Educat. Physics. 54 (2011) 27-30.

[8] Yu.K. Ezhovsky, A.I. Kluikov. Evaluation of reactivity of hydroxyl groups on the surface of some metal oxides on the basis of correlating interrelation, J. Phys. Chem. 72 (1998) 908-911.

[9] 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).

[10] V.N. Parmon and V.S. Zakharenko. Photocatalysis and Photosorption in the Earth's atmosphere, Cat. Tech. 5 (2001) 96-115.

[11] A.M. Volodin, A.E. Cherkashin, K.N. Prokopjev. Formation of radical forms of adsorbed oxygen at illumination of calcium oxide in the area of surface absorption, Kinetics and Catalysis. 33 (1982) 1190-1195.