磁性海泡石吸附水中重金属离子的特性及机理  

Adsorption characteristic and mechanism of heavy metals onto magnetically modified sepiolite

作　　者：余铁萍[1] 戴友芝[1] 王未平[1] 贾明畅[2] 李芬芳[1] 龚敏[1] 

机构地区：[1]湘潭大学环境科学与工程系,重金属污染控制湖南省高校重点实验室,湘潭411105 [2]承德石油高等专科学校,承德067000

出　　处：《环境化学》2013年第8期1566-1570,共5页Environmental Chemistry

基　　金：水体污染控制与治理科技重大专项(2010ZX07212-008);湖南省科学技术厅科技计划重点项目(2011SK2016);湖南省高校创新平台项目(111K070)资助

摘　　要：以化学共沉淀法制备磁性海泡石,通过设置一个外加磁场实现对其的分离回收.主要研究了磁性海泡石吸附水中重金属离子的特性,并结合XRD、FT-IR分析结果探讨了吸附机理,结果表明,磁性海泡石对重金属阳离子的吸附效果优于阴离子;初始pH对磁性海泡石吸附重金属离子的影响不仅取决于磁性海泡石表面的电荷性质,而且与重金属离子的水解能力有关;在吸附过程中,磁性海泡石的物相结构没有发生明显改变,吸附机理表现为离子交换和配合吸附作用.In this paper,magnetically modified sepiolite（MMS） was prepared by chemical coprecipitation,separated and recovered from the solution by setting up an additional magnetic field.By the combination of XRD and FT-IR,the adsorption characteristic and mechanism of heavy metals onto MMS was investigated.The results indicated that MMS adsorbed more heavy metal cations than anions.The influence of the initial pH on the adsorption depends not only on the surface charge of MMS,but also on the hydrolysis abilities of the metal ions.During the process of the adsorption,phase structure of MMS had no significant changes,and the mechanism of adsorption was manifested as ion exchanges and complexing adsorption.

关 键 词：磁性海泡石 吸附 重金属离子 特性 机理 

分 类 号：X703[环境科学与工程—环境工程]