昔格达土对水相中Cd(Ⅱ)的吸附研究

Research on Adsorption of Cadmium in Hydrofacies by the Xigeda Soil

以昔格达土作为吸附剂,对水相中的镉进行了吸附实验研究。结果表明:昔格达土添加量、镉初始浓度、初始pH、温度等对水相中镉的去除效果有影响。在一定范围内,初始pH、温度的增加会提高昔格达土对镉的吸附量及去除率,昔格达土的添加量的增加会降低对镉的吸附量而提高去除率,镉初始浓度的增加会提高对镉的吸附量而降低去除率。昔格达土对镉的最大吸附量是29.4 mg/g。等温吸附过程能够用Langmuir模型进行较好的拟合,拟合的最大吸附量与实验结果基本一致。

An experimental study of the adsorption of the xigeda soil for Cd2＋ in hydrofacies was conducted The results showed that the removal efficiency were dependent on dosing quantity of the xigeda soil, initial pH, temperature and initial concentration of Cd2＋. The removal rate of the xigeda soil increased with increasing dosing quantity, increasing pH, increasing temperature and decreasing initial concentration of Cd2 ＋. The adsorption capac- ity of the xigeda soil increased with decreasing dosing quantity, increasing pH, increasing temperature and increas- ing initial concentration. The equilibrium adsorption capacities for Cd2＋ was 29.4 mg/g. All the isotherm data of the xigeda soil adsorption for Cd2＋ was well fitted by Langmuir model, and the result of data fitting was in good agreement with available experiment data.