强化日光/H_2O_2协同作用对酸性黑染料的降解脱色研究

在H2O2存在条件下,对酸性黑染料进行加强日光照射处理,系统地研究了染料初始浓度、pH值、光照强度、不同阴离子等因素对酸性黑染料废水的脱色效果的影响。结果表明,染料初始浓度越低,光降解速率越高;酸性媒介比碱性媒介更有利于酸性黑光解脱色;染料光解脱色速率随光照强度增加而增加,但在较高光强下时,降解速率增加并不明显。除SO42-离子外,试验范围内的其它Br-、NO3-、Cl-和NO2-等阴离子,均对降解脱色有抑制作用,其中NO2-对脱色作用抑制最显著。处理前后的UV-Vis谱图分析表明酸性黑在H2O2/强化日光光解处理中脱色是因为染料发生氧化光降作用。

Decoloration of acid black dye by amplified sunlight cooperated with H2O2

Acid black dye was treated by amplified sunlight radiation in the presence of H2O2.The influences of initial dye concentration, pH value, light intensity and different anion ions on the decoloration effect were studied systematiclly.The results showed that, higher photodegradation velocity would be obtained with lower initial dye concentration, and the dye could be more efficiently decolorized in an acid media than in a basic media;the decoloration rate of the dye increased with the increase of light intensity, however, the increase of photodegradation velocity was indistinct with higher light intensity.All of the tested anions except of SO42-had inhibitory effect on the decoloration of acid black, of which the effect of NO2-was the most pronounced compared with Br-, NO3-and Cl-.Through the analysis of UV-Vis spectra before and after the treatment, it was indicated that, the decoloration of acid black during the amplified H2O2 / sunlight photolysis treatment was the effect of photooxidation degradation of the dye actually.