title: Photooxidation of azo dye reactive black 5 using a novel supported iron oxide: heterogeneous and homogeneous approach.
abstract: Photooxidation of azo dye Reactive Black 5 (RB5) by H202 was performed with a novel supported iron oxide in a batch reactor in the range of pH 2.5-6.0. The iron oxide was prepared through a fluidized-bed reactor (FBR) and much cheaper than the Nafion-based catalysts. Experimental results indicate that the iron oxide can significantly accelerate the degradation of RB5 under the irradiation of UVA light (wavelength = 365 nm). An advantage of the catalyst is its long-term stability, which was confirmed through using the catalyst for multiple runs in the degradation of RB5. In addition, this study focused mainly on determining the proportions of homogeneous catalysis and heterogeneous catalysis in the batch reactor. Conclusively, although heterogeneous catalysis contributes primarily to the oxidation of RB5 during pH 4.5-6.0, the homogeneous catalysis is of increasing importance below pH 4.0 because of the Fe ions leaching from the catalyst to solution.
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan City, 701 Taiwan. n3890110@ccmail.ncku.edu.tw
authors.forename: C L
authors.initials: CL
authors.lastname: Hsueh
authors.forename: Y H
authors.initials: YH
authors.lastname: Huang
authors.forename: C C
authors.initials: CC
authors.lastname: Wang
authors.forename: C Y
authors.initials: CY
authors.lastname: Chen
mesh_terms: D001391:Azo Compounds / Q000494:pharmacology*; D019149:Bioreactors; D002384:Catalysis; D004396:Coloring Agents / Q000494:pharmacology*; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D009282:Naphthalenesulfonates / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D010777:Photochemistry / Q000379:methods*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D005290:Ferric Compounds; D009282:Naphthalenesulfonates; C000499:ferric oxide; D006861:Hydrogen Peroxide; D007501:Iron; C063421:Remazol black B; D010100:Oxygen