高铁酸钾法去除水中1,1-DCE

选取水中常见的1,1-DCE为目标污染物,通过间歇实验探讨了目标化合物在以高铁酸钾为氧化剂的情况下,不同反应条件下的去除效果、反应动力学以及反应机理。实验结果表明,不同pH值对高铁酸钾去除1,1-DCE的反应速率影响很大,在pH=3时去除效果最好;反应符合一级动力学方程,去除速率随温度升高而增大,且活化能Ea为28.52 kJ/mol,表明温度对高铁酸钾的氧化性有很大影响;反应的ΔH*>0,ΔS*G*>0;以NaNO3调节反应体系的离子强度,当离子强度为0~0.2 mol/L时,高铁酸钾去除1,1-DCE的反应速率随离子强度的增大而减小。通过对实验机理的分析看出,高铁酸钾法去除卤代烃机理为氧化及吸附共存。

Removal of 1,1-dichloroethylene in wastewater by potassium ferrate

Removal of 1,1-dichloroethylene (1,1-DCE) by potassium ferrate in terms of efficiency, reaction kinetics, main influencing factors, and dechlorination mechanism was studied under different reaction conditions. The pH played an important role in 1,1-DCE removal and an optimum value of 3 was obtained. Moreover, the removal process followed pseudo-first-order kinetics and showed ΔH*>0, ΔS*G*>0. The rate constants of 1,1-DCE increased with the increase in temperature with an Ea of 28.52 kJ/mol, while they decreased with the increase in iron strength in the range from 0 to 0.2 mol/L (NO3-). The analysis of the reaction mechanism showed that simultaneous oxidation reaction and adsorption were responsible for the removal of 1,1-DCE by potassium ferrate.