title: Degradation of commercial azo dye reactive Black B in photo/ferrioxalate system.
abstract: The photolysis and photo-catalysis of ferrioxalate in the presence of hydrogen peroxide with UV irradiation (UV/ferrioxalate/H(2)O(2) process) for treating the commercial azo dye, reactive Black B (RBB), is examined. An effort is made to decolorize textile effluents at near neutral pH for suitable discharge of waste water. pH value, light source, type of initial catalyst (Fe(3+) or Fe(2+)) and concentration of oxalic acid (Ox) strongly affected the RBB removal efficiency. The degradation rate of RBB increased as pH or the wavelength of light declined. The optimal molar ratio of oxalic acid to Fe(III) is three, and complete color removal is achieved at pH 5 in 2h of the reaction. Applying oxalate in such a photo process increases both the RBB removal efficiency and the COD removal from 68% and 21% to 99.8% and 71%, respectively.
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan City 701, Taiwan. yhhuang@ccmail.ncku.edu.tw
authors.forename: Yao-Hui
authors.initials: YH
authors.lastname: Huang
authors.forename: Shu-Ting
authors.initials: ST
authors.lastname: Tsai
authors.forename: Yi-Fong
authors.initials: YF
authors.lastname: Huang
authors.forename: Chuh-Yung
authors.initials: CY
authors.lastname: Chen
mesh_terms: D001391:Azo Compounds / Q000528:radiation effects*; D002384:Catalysis; D004396:Coloring Agents / Q000528:radiation effects*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control*; D007501:Iron; D010070:Oxalates / Q000737:chemistry*; D019815:Oxalic Acid; D010777:Photochemistry; D010782:Photolysis; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D010070:Oxalates; D014873:Water Pollutants; C034942:ferrioxalate; D019815:Oxalic Acid; D007501:Iron