臭氧降解水中苯并三唑反应动力学及效能研究

对臭氧氧化去除水中痕量苯并三唑(BTri)的反应动力学、效能及其影响因素进行了实验研究.结果表明，臭氧分子与BTri直接反应速率常数k_Ｏ3=20.18 L·(mol·s)^-1，臭氧与BTri反应的表观反应速率常数K_BTri随pH值的不同而有显著差异，当pH值由6.63增加到7.83时，表观反应速率常数由63.42 L·(mol·s)^-1提高至582.69 L·(mol·s)^-1，增加约8倍.单独臭氧化可以有效地去除水体中痕量BTri，最终去除率可达85％；随着水体pH值的增加及水体温度的升高，BTri的反应速率大幅度提高；自然水体中常见阴离子NO^-₃、SO^2-₄、Cl^-对臭氧化去除BTri的去除率及反应速率无明显影响；羟基自由基(·OH)抑制剂叔丁醇对臭氧氧化去除BTri有一定的抑制作用，说明·OH也对臭氧氧化去除BTri有一定的贡献，表明臭氧化去除BTri的过程为O₃直接氧化及·OH间接氧化共同作用的结果.

Kinetics and Degradation Efficiency of Benzotriazole in Water by Ozonation

Benzotriazole (BTri) is widely used in industrial processes and households as anti-icer and corrosion inhibitors. However, the removal of BTri hasn't been reported yet. The results of an experimental study are presented which provide values for the reaction rate constants between molecular ozone and BTri, and overall reaction rate constants for the degradation of BTri in the pH range of 7-8. The kinetic rate constant for BTri degradation by molecular ozone was calculated to be 20.18 L·(mol·s)^-1 according to the experimental data. The study showed that the reaction between ozone and BTri was influenced by some factors. The degradation rate of BTri increased with the increase of the solution pH value and the water temperature, but changed little in the presence of some anions, such as NO^-₃, SO^2-₄ and Cl^-. The hydroxyl radical inhibitor tert-Butyl alcohol affected the removal of BTri to some degree, which proved that the ozone molecule was cooperated with the hydroxyl radical to remove BTri in the oxidation process.