The hydrogen peroxide oxidizes organic pollutants in the presence of Fe-bearing solid catalysts in the so-called catalytic wet peroxide oxidation (CWPO). Several supports have been used, like zeolites, pillared clays, alumina, silica, mesostructured SBA-15 and activated carbon, mostly in the CWPO of model phenolic compounds. However, few studies are found in the literature dealing with the exploration of the radicals' formation in these processes and their influence on the treatment of wastewaters. The presented work is conducted to explore the mineralization of model organic-water matrix of wastewaters from petrochemical manufacturers. In this study, different irradiation-light sources, active carbon and/or metal/active carbon surface are used. The morphology and composition of the fresh and used materials have been identified by scanning electron microscopy (SEM) and EDX. The electron paramagnetic resonance (EPR) spectroscopy-physicochemical method was utilized to investigate the kinetics of the CWPO process by using EPR/fast scan and EPR/spin trap techniques to identify radical species and intermediates. The hydroxyl radicals were found to be the main oxidizing agent. The optimum conditions toward the remediation of different contaminants in model petrochemical wastewater (PCWW) was achieved. The active carbon supported materials show high activity and reasonable stability.

Electron paramagnetic resonance spectroscopic exploration of radicals' generation in the catalytic wet peroxide oxidation processes

248th National Meeting (2014)

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