几种矿质材料对镉吸附性能的研究

分析了硅藻土、海泡石、钠基膨润土、蒙脱石、麦饭石5种矿质材料对水溶液中镉离子的吸附性能,并检测了3种吸附能力较强的矿质材料对土壤中镉赋存形态的影响。结果显示:海泡石、麦饭石、蒙脱石3种粘土矿对镉的吸附能力均较强,饱和吸附量均超过9mg/kg;这3种矿质材料均能有效降低土壤中镉的弱酸提取态比例,其中,蒙脱石和海泡石的效果较显著,分别比对照降低了7.22%和6.18%。

Study on Cadmiumadsorption Characteristics of Severalmineral Material

The adsorption characteristics of six mineral material:diatomite,sepiolite,Na-modified bentonite,montmorillonite,andmedical stone for cadmium were analyzed. And the effects of some materials with higher adsorption characteristic on different cadmium species in soil were studied. The results showed three minerals of sepiolite,medical stone and montmorilloniteexibited higher cadmium absorption ability,the saturated adsorption capacities are more than 9 mg/kg.All the three minerals can effectively decrease the ratio of cadmium in acid-extractable form, and montmorilloniteand sepiolitecan significantly decreased7.22% and 6.18% ratio of cadmium in acid-extractable form than control, respectively.