膨润土的改性及对重金属离子吸附研究进展

Modification of bentonite and advances in adsorption of heavy metal cations by it

分析了膨润土的结构性质和它对重金属离子的吸附机理。介绍了膨润土的改性处理手段,包括高温焙烧、酸处理和盐处理等。综述了膨润土及改性膨润土吸附水体中铬、镍、铅、铜、铁等重金属离子的应用研究进展。指出膨润土易与水混合成浆状增加了分离难度,解决办法是在分离过程中加入合适的絮凝剂或者对膨润土进行预处理。建议今后应加强膨润土再生的研究。

Structural characteristics and sorptive behaviors and mechanisms for heavy metal cations of bentonite are analysed. Modification methods, including heat-treatment, acid-treatment, salt-treatment etc, are introduced. The research achievements of adsorption of Cr3+ , Ni2+ , Pb2+ , Cu2+ , Fe2+ , Fe3+ , etc by bentonite are summarized. It s also pointed out that the difficulty of separating bentonite from water and gives some pieces of pretreatment advice by using additives. Some suggestions about regeneration...