UV/Mn~(2+)协同催化H_2O_2降解染料X-3B的动力学研究

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。

Dynamic study on degradation of dye X-3B by synergistic catalytic effect of UV/Mn2+ and H2O2

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 /Mn2+ and H2O2 was carried out.The result showed that,UV /Mn2+-H2O2 could effectively degrade X-3B;the beneficial conditions for the improvement of synergistic catalytic effect of UV /Mn2+ 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-,SO42-,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 SO42-and Cl-were mediated by the reaction of them between·OH in the solution.The inhibition effects of SO42-and Cl-increased with the increasing of anions concentration,however,the inhibition effect of NO3-had no relation to anion concentration.