摘要
实验考察稀土元素(La3+、Ce3+、Ho3+、Yb3+)在水合氧化铁表面的吸附动力学过程,对比研究腐殖酸对吸附机制的影响.当腐殖酸与稀土元素共存时,腐殖酸通过化学吸附优先占据氧化铁表面的吸附点位,颗粒物表面特性因覆盖有机膜而得到修饰.初期的动力学过程主要表现为腐殖酸的竞争吸附,随后转变为吸附态腐殖酸对稀土元素的表面结合.轻稀土因较强的结合能力而比重稀土易于被吸附去除,这与天然水体中发生的稀土元素分异现象保持一致.
Kinetics of rare earth elements(La^(3+),Ce^(3+),Ho^(3+),Yb^(3+)) adsorption to the iron oxyhydroxide were investigated,and the effects of humic acid on adsorption mechanism were revealed.Coexisting humic acid with rare earth elements(REEs),the surface sites of iron oxyhydroxide might be occupied preeminently by the humic acid through the chemical adsorption,and the characteristics of the solids are decorated by covering the organic membrane.The adsorption kinetics of REEs initially shows the competitive ads...
出处
《暨南大学学报(自然科学与医学版)》
CAS
CSCD
北大核心
2006年第1期96-102,共7页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
国家教育部资助优秀青年教师项目(1999)
关键词
稀土元素
腐殖酸
水合氧化铁
吸附机制
rare earth elements
humic acid
iron oxyhydroxide
adsorption mechanism