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International Journal of Advanced Technology in Civil Engineering

Abstract

Oxidation by Hydrogen peroxide (H2O2) alone is not effective for degradation of heterocyclic nitrogenous pharmaceutical compounds in water containing pyridine derivatives, because of low rates of reaction at reasonable H2O2 concentrations. Transition metal salts e.g. iron salts and UV-light can activate H2O2 to form hydroxyl radicals, which are strong oxidants . Pyridine derivatives like (2-AP) 2-aminopyridine can be toxic to certain life forms and are rated as priority pollutants by (USEPA) United States Environmental Protection Agency. In the present study degradation of 2-AP using Fenton’s reagent ( iron salt and hydrogen peroxide) in combination with UV light (Photo-Fenton) is used to maximise percent 2-AP and Chemical Oxygen Demand (COD) removal. Also effect of pH, H2O2 concentration and iron concentration on 2-AP degradation efficiencies were investigated at different doses of 2-AP ranging from10-80mg/L using synthetic samples. At [H2O2]:[Fe2+ ] :: [30-47]:1 for Fenton process and [H2O2]:[ Fe2+]:: [27-40]:1 for Photo-Fenton process , maximum 2-AP and COD removal was obtained. 2-AP removal of 95.3% and 100% respectively for Fenton and Photo- Fenton was obtained at pH= 3 corresponding to 10 mg/L initial concentration. The degree of mineralisation achieved was 89% and 94% COD removal. Studies showed that Photo-Fenton treatments are effective in almost complete degradation of 2-AP and can be used to treat polluted water bodies containing pyridine derivatives.

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