UV/Mn^(2+)协同催化H_2O_2降解染料X-3B的动力学研究

Dynamic study on degradation of dye X-3B by synergistic catalytic effect of UV /Mn^(2+) and H_2O_2

研究了初始pH值、溶解氧、H2O2浓度及水中常见阴离子对UV/Mn2+协同催化H2O2降解活性艳红X-3B动力学的影响。结果表明,UV/Mn2+协同催化H2O2能有效地降解染料X-3B;在通入空气0.5L/min、pH值为4、H2O2浓度为10mmol/L的条件下,有利于UV/Mn2+对H2O2的协同催化,提高反应速率;NO3-、SO42-及Cl-等阴离子对X-3B的降解具有抑制作用,其中NO3-的抑制途径是阻碍紫外线透过溶液,而SO42-及Cl-则是直接和溶液中·OH反应产生抑制作用。SO42-及Cl-的抑制作用随着离子浓度的升高而增强,但NO3-的抑制强弱和离子浓度大小无关。

The dynamic study on the influences of initial pH value, dissolved oxygen, H2O2 dosage and common anions in water on the degradation of dye X-3B by synergistic catalytic effect of UV/Mn^2＋ and H2O2 was carried out. The result showed that, UV/Mn^2＋-H2O2 could effectively degrade X-3B; the beneficial conditions for the improvement of synergistic catalytic effect of UV/Mn^2＋ and H2O2 and reaction rate were： the aeration rate was 0.5 L/ min, the pH value was 4 and the mass concentration of H2O2 was 10 mmol/L. NO3-, SO4^2-, Cl- and some other anions had inhibitory effects on the degradation of X-3B, among which NO3- inhibited ultraviolet radiation permeating the solution; the inhibition effects of SO4^2- and Cl- were mediated by the reaction of them between ·OH in the solution. The inhibition effects of SO4^2- and Cl^- increased with the increasing of anions concentration, however, the inhibition effect of NO3^- had no relation to anion concentration.