Modification of bentonite and advances in adsorption of heavy metal cations by it
Lin Zhao · Xiandai huagong · 2002
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 of bentonite are presented for further research.