III International Conference

PP-III-41Catalytic properties of Fe-PILCs and Fe/Al-PILCs were studied in the wet peroxideoxidation of azodyes. It was found that catalytic activities of PILCs correlated with the ironcontained in the catalyst, BET surface area and the total amount of dissolved iron. The effectsof different reaction parameters such as initial pH, catalyst and hydrogen peroxideconcentrations, temperature on the oxidation of the dye aqueous solutions were studied. It wasestablished that Fe/Al (1:10)-PILCs allows almost total colour removal of the dyes (99 %) anda significant removal of COD (82-91 %) without the significant leaching of Fe ions. Leachingtests indicate that the activity of the catalyst Fe/Al (1:10)-PILCs is not due to leached ironions.Fe-PILCs and Fe/Al (1:1)-PILCs also have high catalytic activity, but they are less stable.It was also observed that by using these catalysts it is possible to extend the range of pH value(pH 3-6) for which Fenton-type oxidation can occur. At reuse of catalyst Fe/Al (1:10)-PILCsthe decreasing of a rate of the dye oxidation and iron leaching were insignificant. The resultson oxidation of organic dyes demonstrate prospects of practical use of Fe/Al-PILCs duringthe oxidation of organic pollutants of wastewaters.AcknowledgementsThe authors gratefully acknowledge the Russian Foundation for Basic Research for thefinancial support (Grant 06-08-01064).547