Abstract: Nano-sized α-Fe₂O₃powder was synthesized by refluxing homogeneous precipitation method and characterized subsequently.All the products were high-purity nano-sized α-Fe₂O₃.Influence of drying method and calcination temperature etc.on performance of catalyst was studied.Dy-intermediate wastewater was treated by photocatalytic method with nano-sized Fe₂O₃ as catalyst and highvoltage mercury lamp as light source.Influence of factors,such as the dosage of Fe₂O₃ and H₂O₂,pH,and reaction time,on degradation effect was investigated.Results indicated that the system ofFe₂O₃/UV/H₂O₂ could effectively decline CODCr in wastewater.Under the optimum conditions that the dosage of Fe₂O₃was 1.50 g/L,V(H₂O₂)=1.5‰,pH=3.0,and radiation power and time were 300 W and 4 h,the CODCrof wastewater was reduced from 1 177 mg/L to 533 mg/L,and removal rate of CODCrwas 56.88%.Results also showed that even with sunlight the removal rate of CODCrcould also reach 48.50%.Organic pollutants in treated and untreated wastewater were analyzed by GC-MS and results showed that effective degradation of most pollutants could be reached using the above mentioned method.

Key words: photocatalytic degradation, nanosized Fe2O3, dyeintermediate, wastewater treatment