title: Oxidation of acidic dye Eosin Y by the solar photo-Fenton processes.
abstract: Oxidation of acidic dye Eosin Y has been investigated with Fenton process and photo-Fenton process (solar light or artificial light source). With UV-Fenton process and Fenton, 42.5% and 21.3% of dye could be removed from the water, respectively. However, 94.1% of dye was removed in solar-Fenton in 90min. Based on solar-Fenton process, the effect of pH value and the concentration of dye, Fe(2+), H(2)O(2) as well as oxalic acid concentration on Eosin Y degradation efficiency were investigated. In 60min, 96% of Eosin Y was degraded when the pH value was 3.5 and the concentration of Fe(2+), H(2)O(2) and oxalic acid was 10mol/L, 600mg/L and 300mg/L, respectively. The Eosin Y degradation was dependent on the dye concentration. That is higher Eosin Y concentration resulted in lower degradation efficiency. Under the conditions of pH 3.5, the Eosin Y apparent kinetics equation was -dC/dt=0.000249[Eosin Y](0.78)[Fe(2+)](1.14)[H(2)O(2)](1.26). Meanwhile, this research also proved that oxalic acid could improve the photocatalytic efficiency in the solar-Fenton process.
authors.affiliation: College of Chemistry and Chemical Engineering, Chongqing University, 174 Shapingba Zhengjie, Chongqing 400044, PR China. tmf@cqu.edu.cn
authors.forename: Huaili
authors.initials: H
authors.lastname: Zheng
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Pan
authors.forename: Xinyi
authors.initials: X
authors.lastname: Xiang
mesh_terms: D003116:Color; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects*; D004801:Eosine Yellowish-(YS) / Q000737:chemistry* / Q000528:radiation effects*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019815:Oxalic Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000737:chemistry / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D014873:Water Pollutants; D019815:Oxalic Acid; D006861:Hydrogen Peroxide; D004801:Eosine Yellowish-(YS)