Catalytic wet peroxide oxidation (CWPO) of organic contaminants may have a possible path for the treatment of decontamination waste containing chelating agents that cause a complex with radioactive cations leading to interferences in their removal by various techniques and may pose a hazard to the environment. The aim of the present work was to synthesize and characterize the mesoporous Fe-MCM-41 with various Si/Fe ratios for evaluating the removal of organic contaminants such as ethylenediaminetetraacetic acid (EDTA) and oxalic acid in aqueous solution. The influence of reaction parameters such as time, pH, and temperature was studied to achieve efficient removal of organic contaminant. Among the catalysts studied, Fe-MCM-41 (Si/Fe = 25) provides high-percentage removal of total organic carbon in aqueous solution. The mineralization of organic contaminants was found to be higher in heterogeneous catalysis than homogeneous catalysis (Fe3+). Further, after the reaction, only a minimum percentage (2%) of Fe was leaching from Fe-MCM-41 under optimized condition and the catalyst remained unaltered in its structure.