title: Degradation of gas-liquid gliding arc discharge on Acid Orange II.
abstract: The effects of pH value, initial concentration of dye solution and temperature on the degradation efficiency of Acid Orange II (AO7) using gas-liquid gliding arc discharge were investigated. The influences of pH value and temperature on degradation efficiency were not apparent. Increasing initial solution concentration caused the decrease of degradation rate and the increase of absolute degradation quantity. Considering energy efficiency and absolute degradation quantity, the gas-liquid gliding arc discharge is fit for treating high concentration organic wastewater. A possible mineralization pathway was proposed through the analysis of intermediate products detected by gas chromatograph coupled with mass spectrophotometer (GC-MS) and ion chromatograph (IC). Hydroxyl radicals reacted with the azo linkage-bearing carbon of a hydroxy-substituted ring, leading to the cleavage of -C-N- and degradation of AO7. The solution biodegradability was significantly improved (BOD(5)/COD from 0.02 to 0.43). The toxicity of intermediate products was lower than that of the initial Acid Orange II.
authors.affiliation: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, Zhejiang Province, China.
authors.forename: J H
authors.initials: JH
authors.lastname: Yan
authors.forename: Y N
authors.initials: YN
authors.lastname: Liu
authors.forename: Zh
authors.initials: Zh
authors.lastname: Bo
authors.forename: X D
authors.initials: XD
authors.lastname: Li
authors.forename: K F
authors.initials: KF
authors.lastname: Cen
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C014722:2-naphthol orange