紫外光去除水中微量甲苯的研究

Study on removal of toluene from water in micro-pollution level by UV

紫外光 ( UV)去除水中微量甲苯 ( <10 mg/L )可以用一级动力学方程描述。 p H为 7时 ,去除速率常数 k为 0 .45 3 h- 1 ,半衰期为 1.5 3 h;在 p H为 5～ 9的范围内 ,速率常数和半衰期变化不大。利用气相色谱—质谱联用仪测定了甲苯的降解产物 ,讨论了甲苯降解的机理。测定了甲苯降解过程中溶解氧的变化和 p H的作用。

Removal of micro-pollution level toluene in water by UV could be described by the first-order kinetic equation with rate constant 0.453 h+{-1} and half-life of 1.53 h, which were almost unchanged in the pH range of {5～9.} The degraded products from toluene, formed under the UV, were identified by GC-MS, and the mechanism for degradation of toluene was proposed. The concentration of DO was measured during the process.;