富里酸影响下针铁矿对镉吸持-解吸特征研究

The Characters of Adsorption and Desorption of Cadmium by Goethite under the Effect of Fulvic Acid

通过采用等温吸附热力学方法,探讨针铁矿单独存在以及富里酸-针铁矿共存体系对重金属镉吸附-解吸的特征和影响因素。研究表明:针铁矿对镉的吸附能力较强,在富里酸存在下其吸附能力有所增加,同时也改变了吸附镉的解吸特性。因此,针铁矿-富里酸共存体系对于控制重金属镉污染具有较好的效果。

Isothermal adsorption was carried out to discussed the characters and influential factors ofa dsorption and desorption of cadmium under two conditions.The one is that there is only goethite,and theo ther one is the coexistensive system of fulvic acid and goethite.The results of this experiment show that thea dsorption of cadmium on goethite is intense,and the adsorption is more intense under the condition whichh ave both goethite and fulvic acid.The research shows that the FA-goethite coexistensive system is quitee ffectual in the way of controlling the heavy metal pollution of cadmium.