Oxidation of acidic dye Eosin Y by the solar photo-Fenton processes

• Published in: Journal of hazardous materials Vol. 141; no. 3; pp. 457 - 464
• Main Authors: Zheng, Huaili, Pan, Yunxia, Xiang, Xinyi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 22.03.2007; Elsevier
• Subjects: Acidic dye; Applied sciences; Catalysis; Catalytic reactions; Chemical engineering; Chemistry; Color; Coloring Agents - chemistry; Coloring Agents - radiation effects; Decolorization; Eosin Y; Eosine Yellowish-(YS) - chemistry; Eosine Yellowish-(YS) - radiation effects; Exact sciences and technology; Fenton process; General and physical chemistry; Hydrogen Peroxide - chemistry; Hydrogen-Ion Concentration; Oxalic Acid - chemistry; Oxidation-Reduction; Pollution; Reactors; Solar-Fenton process; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ultraviolet Rays; Water Pollutants - chemistry; Water Pollutants - radiation effects; Water Purification - methods; Acidic dye; Solar-Fenton process; Decolorization; Eosin Y; Fenton process; Discoloration; Dyes; Hydrogen peroxide; Pollutant behavior; Photocatalysis; Ultraviolet radiation; pH; Fenton reaction; Physicochemical purification; Oxidation; Kinetics; Solar radiation; Photooxidation; Photochemical degradation
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2006.12.018

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 90 min. Based on solar-Fenton process, the effect of pH value and the concentration of dye, Fe 2+, H 2O 2 as well as oxalic acid concentration on Eosin Y degradation efficiency were investigated. In 60 min, 96% of Eosin Y was degraded when the pH value was 3.5 and the concentration of Fe 2+, H 2O 2 and oxalic acid was 10 mol/L, 600 mg/L and 300 mg/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 −d C/d t = 0.000249[Eosin Y] 0.78[Fe 2+] 1.14[H 2O 2] 1.26. Meanwhile, this research also proved that oxalic acid could improve the photocatalytic efficiency in the solar-Fenton process.