强化日光/H_2O_2光解脱色酸性黑染料的动力学

Kinetics of Photolytic Decoloration of Acid Black Dye by Amplified Sunlight/H_2O_2 Oxidation

在H2O2存在条件下,对酸性黑染料进行强化日光照射处理,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脱色的动力学影响。结果表明,染料光解脱色速率随光照强度的增加而增加,但在较高光强下时,降解速率增加并不明显。酸性黑在酸性媒介的光解脱色速率比碱性媒介略大。除SO42-离子外,实验范围内的其它Br-、NO3-、Cl-和NO2-等阴离子,均对降解速率有负影响,其中NO2-对脱色降解速率影响最显著。处理前后的UV-Vis谱图分析表明酸性黑在强化日光/H2O2光解处理中脱色是因为染料发生氧化光降作用。

Acid black was subjected to amplified sunlight radiation in the presence of hydrogen peroxide. The effect of different factors such as initial dye concentration, pH value, light intensity and different anion ions on the dye decoloration effici.ency was studied. Results showed that the dye decoloration rate increased with the increase of light intensity, but was indistinct for higher light intensity. Examination of effect of pH value showed that dye could be more efficiently decolorized in an acid media than basic media. All of the anions tested except of SO4^2- had an inhibitory effect on the decoloration of acid black, of which the effect of NO2^- was the most pronounced compared with Br^-, NO3^- and Cl^-. UV- Vis spectra indicated that the decoloration of acid black during amplified sunlight/H2O2 photolysis treatment was the degradation of dye actually.