麦饭石对重金属镉吸附效果的研究

通过体外试验分别从麦饭石的添加量、溶液pH、溶液初始浓度、吸附时间等方面研究麦饭石对重金属镉的吸附作用,确定其最佳吸附条件,并进一步研究麦饭石对其他矿物元素的吸附性。结果表明,麦饭石对重金属镉的吸附率随麦饭石添加量、溶液pH的增加而增加;随着溶液中镉的初始浓度的增加麦饭石的吸附率下降,麦饭石对镉的单位吸附量在镉的初始浓度为50 mg/L时达到最大,而吸附率随着溶液中镉的初始浓度的升高而降低;麦饭石对重金属镉的吸附在60 min时达到吸附平衡;在锌、铁、铜、锰、硒、镉和钴离子的混合溶液中,麦饭石对各种矿物元素的吸附大小为 Cd＞Fe＞Se＞Co＞Cu＞Zn＞Mn。

Research on the Absorption of Cadmium by Medical Stone under Different Conditions in vitro

We studied the absorption of cadmium by medical stone in vitro under the following four different conditions,which were the amount of medical stone added,solution pH,solution initial concentration and reaction time aiming at finding out the optimum absorption conditions. Besides we studied the absorption of other mineral elements too. The results showed that the absorption rate would increase when the amount of medical stone added and the solution pH increased,while it would fall when the solution initial concentration increased,the unit absorption quantity would peak as the concentration being 50 mg/L, and with the initial concentration of cadmium increasing, the absorption rate reduced.The time of absorption equilibrium was 60 min. The mixed solution contained zinc,iron,cooper,selenium,manganese,cadmium and cobalt,in which we could see that the adsorption capacity of 7 metals followed Cd＞Fe＞Se＞Co＞Cu＞Zn＞Mn.