Browsing by Author "Dhanasekara, S.A.K.M."

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    Kinetics Modelling of Partial Degradation of Carbofuran by Pyriye
    (Uva Wellassa University of Sri Lanka, 2011) Dhanasekara, S.A.K.M.; Walewela, N.; Jayarathna, L.; Nanyakkara, K.G.N.; Weerasooriya, R.
    Fenton Process is initiated by the formation of hydroxyl radical in accordance with the classical Fenton's reaction: Fe2+00 + H2024 OH + Fe3+0,4) If the product Fe" is reduced, the Fe2+ is regenerated for the next Fenton cycle; hence, Fe34 acts as an auto-catalyst. This reaction is also known to occur when Fe2+ is present in solid phase (Cohn et al., 2006; Kwan and Volker; 2003; Watts et al., 2003). The slow conversion of H202 -9 OH when magnetite, iron hydroxides, or pyrite are present is ascribed to a Fenton like mechanism (Cohn et al., 2006). In nature pyrite is the most abundant of metal sulfides. In Sri Lanka pyrite is an unwanted substrate in graphite industry. It is intimately associated with graphite by degrading the quality of the nation's graphite resource and it is confirmed that pyrite can be used as a starting material for purification of the water polluted with organic pollutants in both the presence and absence of light (Weerasooriya et al., 2006). When properly fabricated, pyrite based OH generation technology will hold a great promise in water treatment industry due to its simplicity, cost-effectiveness, and environmentally friendliness. Carbofuran (2,2-dimethy1-2,3-dihydro- I -benzofuran-7-y1 methylcarbamate) is a broad spectrum carbamate pesticide. Because of high water solubility of carbofuran (320 mg/liter at 25 °C) the risk of ingestion in to the human body is high Kidd and James (1991). Carbofuran, was selected for the present study with the aim of investigating its degradation in pyrite mediated aqueous environments under anaerobic conditions due to its wide use as an insecticide and nematicide in agricultural applications and high toxicity (Bachman et al., 1999).