H_2O_2/强化日光协同光解脱色直接湖蓝染料研究

Study on photolytic decoloration of direct sky blue by amplified sunlight

在H2O2存在条件下,对直接湖蓝染料进行强化日光辐照处理。研究染料初始浓度、H2O2浓度、pH值、不同阴离子等因素对直接湖蓝染料的脱色效果影响。结果表明:在pH酸性媒介中直接湖蓝能有效地光解脱色。与SO42-、NO2-、Cl-相比,Br-和NO3-对脱色作用抑制最显著,而且两者能形成协同作用抑制光解脱色。染料光解脱色速率随H2O2浓度的增加而增加,但在高H2O2浓度时,降解速率增加不明显。处理前后的UV-Vis谱图分析表明直接湖蓝在H2O2/强化日光光解处理中脱色是因为染料发生光解作用。

Direct sky blue was treated with amplified sunlight radiation in the presence of hydrogen peroxide. The effects of factors such as the initial dye concentration, the H2O2 concentration, the pH value and different inorganic anions on the effectiveness of decolomtion of direct sky blue were studied. The results show that direct sky blue dye can be efficiently decolorized in acid media. Br^- and NO3^-have a stronger inhibitory effect on the photolytic decoloration of direct sky blue than SO4^2-, NO2^- and Cl^-. The coexistence of two different anions has a synergistic inhibition effect on the photolysis decolomtion. The photolysis decoloration rate increases with the concentration of H2O2, but, with a high concentration of H2O2, the improvement is not obvious. UV-Vis spectra before and after the treatment were analyzed. It was showed that the decoloration of direct Sky blue during the amplified sunlight with H2O2 photolysis treatment was due to the dye photolysis.