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Background & Aims of the Study: Toluene-2, 4-diamine (TDA) is a famous carcinogenic aromatic amine that is mostly employed as an intermediate in the production of dyes and toluene diisocyanate. In this study, degradation and mineralization of TDA were investigated by UV/H₂O₂ process.

Materials & Methods: This study is an experimental investigation on a laboratory scale. The study performed on synthetic wastewater that holds TDA. The influence of different operating variables such as the initial dosage of H₂O₂ and TDA, additive salts and pH was investigated. The optimization of variables was done by one factor at a time method.

Results: The results specify that the degradation efficiency relies on the H₂O₂ and TDA concentrations, so that reduces as the initial concentrations of TDA are improved, but, it enhances with increasing the extent of H₂O₂ until an optimum value and then decreases to some extent. The reaction rate significantly reduced with an increase in initial pH value in alkaline solution, which means hydroxide ions could inhibit the degradation of TDA. The removal time was increased with an increase in the initial concentration of TDA. The optimal conditions were obtained at pH of 7, initial concentration of pollutant and hydrogen peroxide at  M and  M, respectively. At optimum condition, the removal of TDA and Chemical Oxygen Demand (COD) was 97.6 and 43.5%, respectively.