阳离子对零价铁修复重金属铅污染水体的影响

摘要

研究了阳离子(钙离子、镁离子)对零价铁去除水体中铅污染的影响.结果表明,钙离子、镁离子都可以抑制零价铁去除水体中铅污染,其中镁离子抑制作用更强,且抑制作用随着离子浓度的增大而增强;反应液pH值升高.钙离子、镁离子存在时,零价铁对铅的去除反应符合准一级反应动力学模型,速率常数的大小与离子种类及浓度有关.%We discussed the effect of cations( calcium ion and magnesium ion) on remediation of lead-polluted water by zero-valent iron. Results showed that calcium ion and magnesium ion could restrain the remediation of lead-polluted water by zero-valent iron,and the pH value of reaction liquid increased. Furthermore,magnesium ion had a greater inhibi-tory effect,and inhibitory effect was enhanced with the increase of ion concentration. The removal reaction of lead by zero-valent iron accorded with the pseudo-first-order reaction dynamical model in the presence of calcium ion and magnesium ion,and speed constant was related to ion species and ion concentration.