Degradation of commercial azo dye reactive Black B in photo/ferrioxalate system.
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.
Huang
Yao-Hui
YH
Department of Chemical Engineering, National Cheng Kung University, Tainan City 701, Taiwan. yhhuang@ccmail.ncku.edu.tw
Tsai
Shu-Ting
ST
Huang
Yi-Fong
YF
Chen
Chuh-Yung
CY
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
D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D010070:Oxalates; D014873:Water Pollutants; C034942:ferrioxalate; D019815:Oxalic Acid; D007501:Iron