title: Effects of oxidant concentration and temperature on decolorization of azo dye: comparisons of UV/Fenton and UV/Fenton-like systems.
abstract: This study applies photo-Fenton and photo-Fenton-like systems to decolorize C.I. Reactive Red 2 (RR2). The oxidants were H(2)O(2) and Na(2)S(2)O(8); Fe(2+), Fe(3+), and Co(2+) were used to activate these two oxidants. The effects of oxidant concentration (0.3-2 mmol/L) and temperature (25-55 °C) on decolorization efficiency of the photo-Fenton and photo-Fenton-like systems were determined. The decolorization rate constants (k) of RR2 in the tested systems are consistent with pseudo-first-order kinetics. The rate constant increased as oxidant concentration and temperature increased. Activation energies of RR2 decolorization in the UV/H(2)O(2)/Fe(2+), UV/H(2)O(2)/Fe(3+), UV/Na(2)S(2)O(8)/Fe(2+) and UV/Na(2)S(2)O(8)/Fe(3+) systems were 32.20, 39.54, 35.54, and 51.75 kJ/mol, respectively.
authors.affiliation: Department of Environmental and Safety Engineering, National Yunlin University of Science and Technology, Taiwan.
authors.forename: C Y
authors.initials: CY
authors.lastname: Kuo
authors.forename: C Y
authors.initials: CY
authors.lastname: Pai
authors.forename: C H
authors.initials: CH
authors.lastname: Wu
authors.forename: M Y
authors.initials: MY
authors.lastname: Jian
mesh_terms: D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D013696:Temperature; D014227:Triazines / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: C045076:Fenton's reagent; D009282:Naphthalenesulfonates; D016877:Oxidants; D014227:Triazines; D014874:Water Pollutants, Chemical; C098610:reactive red 2; D006861:Hydrogen Peroxide; D007501:Iron