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Revista Colombiana de Química
versão impressa ISSN 0120-2804versão On-line ISSN 2357-3791
Resumo
RODRIGUEZ, Diana C.; LOPEZ, Blady; PENUELA, Gustavo A. e 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%.
Palavras-chave : photocatalysis; water treatment; malathion; pesticides; solar collector; radiometer.