Abstract

RODRIGUEZ, Diana C.; LOPEZ, Blady; PENUELA, Gustavo A.  and  AGUDELO, Sergio. EVALUATION OF DEGRADATION AND MINERALIZATION OF THE MALATHION USING PHOTOCATALYSIS WITH A SOLAR COLLECTOR. Rev.Colomb.Quim. [online]. 2009, vol.38, n.2, pp.221-234. ISSN 0120-2804.

A solar panel was used to evaluate malat-hion degradation. A solution of 15 µg/L of malathion, three different concentrations of titanium dioxide (100, 200 y 250 mg/L) and hydrogen peroxide (H₂O₂)to 30% like a oxidant agent. Malathion concentration was determined by gas chromatography with CG-µECD previous preparation of sample using octadecyl (C₁₈) extraction disks. The mineralization was determined by analysis of total organic carbon (TOC). The degradation process was evaluated for 16 hours, period during which the incident solar irradiation was registered by a radiometer (Kipp & Zonen, model CUV 3). 58,8% of degradation in photolysis and 98,7% of degradation in photocatalysis with 250 mg/L TiO₂ and 10 mL/h H₂O₂ were reached. The percentage of mineralization reached during photocatalysis was 73%.

Keywords : photocatalysis; water treatment; malathion; pesticides; solar collector; radiometer.

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