双氧化剂光催化降解水中邻苯二甲酸酯类污染物

采用过硫酸钠/双氧水双氧化体系光催化氧化降解水中邻苯二甲酸酯类有机污染物,考察了过硫酸钠/双氧水的投加比例、紫外光强、溶液pH以及邻苯二甲酸二辛酯(DOP)的初始浓度等因素对降解率的影响,并在优化条件下对降解反应的动力学进行了考察。结果表明:室温下,过硫酸钠和双氧水浓度均为0.2mol/L且体积比为1:1,pH=7.0,光照距离为0.5cm,反应80min,DOP降解率达98%以上,反应动力学研究表明,过硫酸钠/双氧水双氧化体系光催化氧化降解水中DOP反应为表观一级。优于相同条件下两种氧化剂单独使用对DOP的降解效果。

Photocatalytic Degradation of Phthalic Acid Ester Pollutants in Water by Double Oxidants

The objective of this study was to use sodium persulfate /hydrogen peroxide as double oxidants to degradate phthalic acid ester organic pollutants in water by photocatalytic oxidation . We investigated the ratio of sodium persulfate and hydrogen peroxide、ultraviolet intensity、solution pH and the initia concentration of DOP on the influence of the degradation rate. Reaction kinetic of degradation reaction under optimized conditions was also studied .It showed that when the concentrations of sodium persulfate and hydrogen peroxide were 0.2mol/l,with the volume ratio of 1：1,pH=7.0,lighting distance to 0.5 cm, reaction 80 min,the degradation rate of DOP was more than 98%. Reaction kinetic studies suggestted the sodium persulfate /hydrogen peroxide as double oxidants to photocatalytic oxidation degradate DOP was pseudo-first-order reaction, which was superior to use single oxidant under the same conditions.