针铁矿对重金属离子的吸附作用

Adsorption of heavy metal ions on goethite

对针铁矿合成试验和针铁矿吸附重金属离子进行了研究。试验结果表明 ,针铁矿可用铁矿废渣获得 ,通过酸碱中和的方式所获得的针铁矿是微细针状。针铁矿对重金属离子具有强烈的吸附作用 ,对Cu2 + 、Zn2 + 和Cd2 + 的吸附边界pH值分别为 4 .3,5 .8和 7.3,且吸附率最高可达 95 %以上 ;尤其对Pb2 + 的吸附作用更加强烈 ,在pH值为 3.5时吸附率就达到 95 % ,并且随着pH值的升高吸附率仍在 95 %以上。研究表明 ,铁矿废渣可被利用制备针铁矿 ,针铁矿用于含重金属离子污水的处理 。

Heavy metals are considered as highly toxic substances.There are usually high heavy metal levels in mine water and soil.The heavy metal ions are removed from aqueous solutions by sorption onto synthetic goethite during laboratory experiments.The experimental results show that the adsorption of Cu 2+ ?Zn 2+ and Cd 2+ on geoethite are intense.There is an obvious adsorptive boundary pH value.The solution pH value is an important parameter for sorption.The boundary values of Cu 2+ ?Zn 2+ and Cd 2+ are 4.3 ?5.8 and 7.3 and the maximum adsorptive rates of heavy metal ions can reach over 95%.Especially the adsorption of Pb 2+ on goethite is more intense, when pH is 3.5 the adsorptive rate is 95%.With pH increase, the adsorptive rate increase over 95%.Goethite is efficient approach to treat heavy metel in waste water.