Optika Atmosfery i Okeana Journal

Vol. 15, issue 05-06, article # 20

Zakharenko V. S., Moseichuk A. N., Parmon V. N. Chemical processes photoinduced on solid tropospheric aerosols. // Atmospheric and oceanic optics. 2002. V. 15. No. 05-06. P. 448-452. PDF
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Abstract:

Experimental results obtained indicate that organofluorine and organochlorine compounds containing hydrogen atoms experience destructive photosorption on MgO aged for a long time in air under conditions close to the tropospheric ones. The photosorption rate is higher for halogen-containing hydrocarbons (HCH) including fluorine while being several times lower for chlorine-containing hydrocarbons. The amount of photosorbed HCH at room temperature and at the pressure of 1 Pа can exceed 15% of MgO surface, that confirms the hypothesis of a substantial contribution of the photoprocesses on the MgO surface to removal of these HCH from the troposphere. The absence of photosorption activity with respect to HCH on gamma-Al₂O₃ (S_sp = 150 m²/g) and SiO₂ (S_sp = 500 m²/g) is connected with the difference in crystallinity of the studied oxide powders.