3种天然吸附剂对水中重金属的吸附效果研究

Adsorption Effects of Three Natural Adsorbents on Heavy Metal in Water

天然吸附剂对重金属吸附效果不同,关于不同种类的天然吸附剂对重金属吸附效果的比较研究较少。本试验进行了香菜种子、蛋壳内膜和人类头发对Pb、Cd、Cr的静态吸附效果研究。结果表明,3种吸附剂对重金属Cr的吸附率顺序为蛋壳内膜>人类头发>香菜种子,对Cd和Pb的吸附率顺序均为人类头发>香菜种子>蛋壳内膜,人类头发对Pb和Cd的吸附率分别是香菜种子的1.27倍、1.62倍。人类头发和香菜种子对3种重金属的吸附率顺序均为Pb>Cd>Cr,蛋壳内膜对3种重金属的吸附率顺序为Cr>Pb>Cd。因此,净化水中Pb和Cd时,可优先选择废弃毛发;净化水中Cr时,选蛋壳内膜效果更好。

Natural adsorbents have different adsorption effects on heavy metals,and there is limited comparative research on the adsorption effects of different types of natural adsorbents on heavy metals.This experiment conducted a static adsorption effects study on lead(Pb),cadmium(Cd)and chromium(Cr)by coriander seeds,eggshell inner membrane and human hair.The results showed that the order of adsorption rates of the three adsorbents for Cr was eggshell inner membrane>human hair>coriander seeds.The order of adsorption rates for Cd and Pb was human hair>coriander seeds>eggshell inner membrane.The adsorption rates of Pb and Cd by human hair were 1.27 times and 1.62 times of that of coriander seeds,respectively.The order of adsorption rates of three heavy metals by human hair and coriander seeds were both Pb>Cd>Cr,while the order of adsorption rate of three heavy metals by the eggshell inner membrane was Cr>Pb>Cd.Therefore,when removing lead and cadmium from water,priority should be given to waste hair;when removing chromium,selecting the eggshell inner membrane would get better effect.