Fe/CeO_2 Catalysts for Highly Efficient Degradation of Congo Red at Low Temperature

Abstract

Currently,the organic dyes are the one of main industrial pollutants.The degradation of dyes has been paid increasing attention.In this paper,Fe/CeO2 catalysts were prepared by sol-gel and impregnation method and the catalytic degradation properties toward Congo red were investigated.The structures of catalysts were characterized by X-ray diffraction(XRD) and N2 adsorption-desorption.The results of characterizations show that the crystalline structure of CeO2 is unchanged by addition of transition metal Fe into CeO2 and Fe species display highly dispersed state.In the range of 5 ℃ to 35 ℃,the 2.0%(by mass) Fe/CeO2 catalyst for degradation of 10 mg/L azo dyes Congo red by catalytic wet hydrogen peroxide oxidation(CWPO) demonstrates highly catalytic activity.Furthermore,at room temperature(25 ℃),the degradation percentage of Congo red is 96% with the amount of 0.05 g catalyst and 0.02 mol/L H2O2(30%(by mass)) after reacting 40 min.At the same time,the repetitive experimental results of catalyst have shown that the catalyst displays excellent stability.