凹凸棒石黏土对Cd^(2+)的吸附作用及影响因素

Adsorption & Affecting Factors of Attapulgite to Cd^(2+)

通过室内吸附实验,表明凹凸棒石黏土(凹土)对重金属离子Cd2+有很好的吸附作用,吸附作用受溶液pH值影响明显。增大镉离子初始浓度,有利于提高凹土对Cd2+吸附量,但是去除率降低。支持电解质对凹土吸附Cd2+也产生影响,Ca2+的影响比Na+和K+的大。

The adsorption of attapulgite to cadmium ions was studied by indoor adsorption test. The results showed that attapulgite have a high affinity for cadmium ions, and sorption is affected by pH of solution evidently. It is advantageous to adsorption of cadmium ions that initial concentration is increased. Sorption is also affected by background electrolyte,and compared with natrium ions and kalium ions,sorption is affected by calcium ions more remarkably.