关键词:

等离子体, 滑动弧放电, 酸性橙Ⅱ, 降解率

Abstract:

Acid Orange Ⅱ solution was degraded by gas-liquid gliding arc discharge，and its degradation kinetics and degradation mechanism were studied.The results showed that,when applied voltage was 10 kV，carrier gas was O₂，gas flow rate was fixed at 0.4 m³·h^-1，wastewater flow rate was 20 ml·min^-1，shortest electrode distance was 3.5 mm，solution concentration was not more than 300 mg·L^-1，the degradation reaction of Acid Orange Ⅱ by gliding arc discharge followed the first-order law.The absolute quantities of H₂O₂，O₃ and the relative quantity of OH· produced by gliding arc discharge in distilled water were measured.The main intermediates were detected during decomposition，such as acetic acid，oxalic acid，malonic acid，phenol，3-hydroxyhypnone，naphthalene，benzene sulfonic acid，phthalic acid（anhydride），β-naphthalene etc. by ultraviolet-visible（UV-Vis）spectroscopy，ion chromatograph（IC）and gas chromatograph coupled with mass spectrophotometer（GC-MS）techniques.The possible degradation pathway of Acid Orange Ⅱ was also speculated，that was，hydroxyl radical reacted with the azo linkage-bearing carbon of naphthol-ring，and the C—N cleaved，the azo-dye decolored and mineralized.

Key words:

等离子体, 滑动弧放电, 酸性橙Ⅱ, 降解率