Degradation of Acid Orange 7 Solution by Air-liquid Gliding Arc Discharge in Combination with TiO2 Catalyst

被引:0
|
作者
Du Chang-ming [1 ]
Xiong Ya [1 ]
Zhang Lu-Lu [1 ]
Wang Jing [1 ]
Jia Shi-Guo [1 ]
Chan Chuen-yu [1 ]
Shi Tai-Hong [1 ]
机构
[1] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China
关键词
Non-thermal plasma; Gliding arc; TiO2; Decolorization; Degradation; Acid Orange 7; AZO DYES; PHOTOCATALYTIC DEGRADATION; WATER; PLASMA; DECOLORIZATION; 4-CHLOROPHENOL; OXIDATION;
D O I
暂无
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The degradaiton of Acid Orange 7 (AO7) using the plasma-catalytic process, has been stdudied by non-thermal gliding arc technique coupled to P25 titanium dioxide (TiO2). Eperiments were carried out to optimise the amount of photo-catalyst. The results showed that maximum decolorization and degradation were attained 0.5 g l(-1) TiO2 concentration. At this optimum concentration, the dye (180 mu M) was totally decolorized within 75 min plasma/TiO2 treatment, and 92.5% removal of initial chemical oxygen demand (COD) was attained after a 125 min plasma/TiO2 treatment. The extent of degradation decreased with initial concentration and the absolute removal amount increased. In all cases, the plasma-treated samples in the presence or absence of catalyst were found to follow pseudo first-order reaction kinetics. The main intermediates of AO7 degradation were benzenesulfonic acid, hydroquinone, 1,4-benzoquinone, 1,2-naphthoquinone, ring cleavage products (oxalic acid, acetic acid, malonic acid and others). Furthermore, possible pathways of AO7 degradation in solution were proposed.
引用
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页码:17 / 22
页数:6
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