中文摘要：

为深入了解接触辉光放电等离子体降解水中有机污染物的机理,用紫外-可见吸收光谱法研究了放电过程中染料结构的变化,考察了pH值、自由基清除剂等实验条件对艳红B脱色的影响.结果表明：加入羟基自由基清除剂可增强艳红B的脱色效果,加入氢自由基清除剂对艳红B的脱色有轻微的阻碍作用.溶液初始pH值在7.0~11.0之间时对脱色影响不大.随着反应的进行,溶液的化学需氧量逐渐升高.紫外-可见吸收光谱分析表明,等离子体产生的活性氢原子对偶氮键的破坏是艳红B脱色的主要原因.

英文摘要：

To probe the mechanism of brilliant red B degradation by contact glow discharge plasma in water,changes in dye structure during the treatment were studied by UV-Vis spectrometry,and the influences of initial pH and radical scavengers on the bleaching were examined.Experimental results showed that addition of tert-butyl alcohol enhanced while addition of H2O2 slightly inhibited the brilliant red B bleaching.Initial pH had little effect on the bleaching rate in the range from 7.0 to 11.0.Chemical oxygen demand of the solution increased gradually with increasing treatment time.UV-Vis spectra analyses showed that the reactive hydrogen atoms produced by plasma were the most likely species responsible for the azo-bond destruction and bleaching.