重金属离子在钠基膨润土中的吸附特征与机理  

Adsorption characters and mechanisms of heavy metal ions in Na-bentonite

作　　者：杨秀敏[1] 钟子楠[1] 潘宇[1] 程晓霞[1] 

机构地区：[1]黑龙江科技学院资源与环境工程学院,哈尔滨150027

出　　处：《环境工程学报》2013年第7期2775-2780,共6页Chinese Journal of Environmental Engineering

基　　金：黑龙江省教育厅项目(12521478)

摘　　要：膨润土是一种天然粘土矿物,比表面积大、吸附能力强。通过钠基膨润土对复合重金属离子Cu2+、Zn2+和Cd2+的竞争吸附实验研究,探讨了钠基膨润土对Cu2+、Zn2+和Cd2+的吸附特征。结果表明,钠基膨润土对Cu2+、Zn2+和Cd2+的吸附随离子浓度增加而增大。吸附具有选择性,Cu2+、Zn2+和Cd2+的吸附能力大小顺序为Cu2+>Zn2+>Cd2+。并通过XRD及IR等分析探讨了钠基膨润土的吸附机理主要表现为离子交换吸附。Bentonite is a kind of natural clay mineral that possesses much larger specific surface area and adsorption capacity. The adsorption capacities of Na-bentonite in absorbing Cu2＋, Zn2＋ and Cd2＋ were studied. The experimental results showed that the absorbability of the Na-bentonite increased with increasing concentration of metals ions, and were found to have selectivity in the order of Cu2＋〉Zn2＋〉Cd2＋. The absorption mechanism of was analyzed by XRD, IR, etc. with the results indicated that ion-exchange adsorption were key forms.

关 键 词：钠基膨润土 重金属 吸附特征 吸附机理 

分 类 号：X53[环境科学与工程—环境工程]