高锰酸钾降解两种磺胺衍生物动力学方程的建立

Potassium permanganate degradation of two types of sulfonamide derivatives to establish dynamic equation

用绿色氧化剂高锰酸钾对水体中两种磺胺类衍生物及其相对应的氨基衍生物分子进行氧化降解,通过测定不同时间下的吸光度值来确定高锰酸钾被消耗的量,建立假一级反应动力学方程,最终计算出二级反应速率常数,并由此初步掌握磺胺衍生物的降解程度及降解机制:在酸性条件下,磺胺噻唑、磺胺异叼恶唑、2-氨基噻唑和5-氨基-3,4-二甲基异叼恶唑的二级反应速率常数分别为44.17、105.14、19.24和74.86 mol-1·L·s-1;在碱性条件下,它们的二级反应速率常数分别为6.81、0.28、63.75和17.08 mol-1·L·s-1。

Abstract ： Two sulfa derivatives and their corresponding amino derivatives in water were degraded by the green oxidant, potassium permanganate. The absorbance of potassium permanganate was measured at different times to determine its consumption rate. A pseudo first order kinetic equation was established to calculate the second order reaction rate constant and therefore to understand the degradation mechanism. The oxazole secondary reaction rate constants were 44. 17, 105.14, 19.24 and 74. 86 mol-1·L · s^-1 respectively for sulfathiazole, sulfamethoxazole, 2-aminothiazole and 5-amino-3,4-dimethyl-isoxazole at acidic conditions. The oxazole secondary reaction rate constants were 6. 81, 0. 28, 63.75 and 17. 08 mol ^- 1 · L· s^ - 1 respectively for sulfathiazole, sulfamethoxazole, 2-aminothiazole and 5-amino-3,4- dimethyl-isoxazole at alkaline conditions.