Ultrasonic preparation and characterization of CeO2 doped with Fe/Al2O3 catalyst in photo-Fenton reaction
(1. School of Environmental Science and Engineering, South China University of Technology,Guangzhou 510640, China;2. Institute of Environmental Engineering, Jimei University, Xiamen 361021, China)
Abstract: Abstract: Ce-Fe/Al2O3 catalysts possessing the same iron load amount were prepared with and without ultrsonic assitant during the impregnation step to solve the problem of low activity of catalyst in the process of photo-Fenton reaction. The surface morphology, reduction property, optical absorption characteristic, BET surface area and valency of Fe and surface distribution of catalysts were characterized through SEM, H2-TPR, DRS, BET and XPS analysis respectively. Activity and stability of catalysts were estimated by utilizing photo-Fenton decoloration reaction of medium yellow (MY10). The results show that catalyst prepared by ultrasonic treatment for 20 min causes activated component Fe2O3 to be highly dispersed. The growth of Fe2O3 particles is inhibited and the optical absorption increases. BET surface area increases from 221.3 to 247.8 m2/g and micropore structure is improved. The Fe content in catalyst surface increases from 0.24% to 0.38% and the catalytic activity of catalyst is improved. This catalyst can cause discoloring of MY10 under the condition of pH 6.0 in 60 min.
Key words: water treatment; advanced oxidation; photo-Fenton reaction; heterogeneous catalyst; ultrasonic