高锰酸钾降解地下水中PCE的研究

Oxidation of terachloroethylene in groundwater with permanganate

以氯代有机污染物中常见的PCE为目标污染物，以自制高锰酸钾溶液为氧化剂，采用批实验方法，探讨了高锰酸钾降解PCE的反应动力学、影响因素以及反应机理。反应结果表明，高锰酸钾降解PCE的反应符合一级动力学方程，反应活化能E为57．119kJ／mol，在30℃条件下，反应速率常数为0．0076min^-1，半衰期为91．20min。在pH在3～10，离子强度在0～0．1030mol／L之间变化时，反应速率不受明显影响。

As one of the widely existent pollutant,terachloroethylene （PCE） was chosen as the aim pollutant, and the self-made permanganate solution was chosen as oxidant. The batch experiment method was used to investigate the reaction kinetics, influencing factors and dechlorination mechanism of PCE. Experimental results have shown that the reaction appears to be first order and has an activation energy of 57.119 kJ/mol. The reaction rate constant Kobs was 0. 0076 min^-1 and the half-life t1/2 was 91.20 min at 30 ℃. The reaction rate constant of PCE was almost not affected by pH（3 - 10） and ionic strength（0 -0. 1030 mol/L）.