UV/H2O2降解水中含氮消毒副产物-苯乙腈的动力学和影响因素

Influencing Factors and Kinetics of Degradation of Nitrogenous Disinfection Byproducts（DBPs）-Phenylacetonitrile in Water by UV/H2O2 Process

采用UV/H2O2高级氧化技术处理水中含氮消毒副产物苯乙腈,研究了影响苯乙腈降解的因素。结果表明,单纯UV体系中,去除效果不明显。UV/H2O2对苯乙腈具有较高的去除率,且降解符合一级反应动力学。随着过氧化氢投加量增大,苯乙腈的去除率呈先增大后减小的趋势,且在投加量为20 mg/L时可达94.9%;溶液初始浓度的增加会提高去除效果,且动力学速率常数增加;降低溶液pH值、增大紫外辐射剂量有利于降解速率和去除率的提高;自来水为基质对降解苯乙腈的影响不明显;Cl-、Mg2+、Al3+对苯乙腈去除有一定的抑制作用,抑制率达20.9%以上。文中将UV/H2O2高级氧化技术应用于控制苯乙腈,以期为水中苯乙腈的降解提供基础理论。

UV/H202 AOP was used to treat the nitrogenous DBP phenylacetonitrile in water,and the factors affecting the degradation of phenylacetonitrile were studied.The results showed that in the pure UV system,the removal effect was not obvious.UV/H2 O2 had a high removal rate of phenylacetonitrile,and the degradation accords with the first-order reaction kinetics.With the increase of hydrogen peroxide dosage,the removal rate of phenylacetonitrile increased first and then decreased,and reached to 94.9% when the dosage was20 mg/L.The increase of the initial concentration of the solution increased the removal effect and the rate constant.The decrease of the pH value of the solution and the increase of the ultraviolet radiation dose were beneficial to the degradation rate and the removal rate.The effect of tap water on the degradation of phenylacetonitrile was not obvious;Cl-,Mg2+,Al3+ had a certain inhibitory effect on the removal of phenylacetonitrile,and the inhibition rate was over 20.9%.UV/H2 O2 AOP was applied to control phenylacetonitrile in this paper,in order to provide a basic theory for the degradation of phenylacetonitrile in water.