黄土对钕(Ⅲ)和铈(Ⅲ)在不同pH下的等温吸附特性  

The sorption isotherms of neodymium(Ⅲ) and cerium(Ⅲ) on loess at different pH values

作　　者：储昭升[1] 刘文新[1] 汤鸿霄[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《环境科学学报》2003年第2期211-215,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金 ( 2 0 0 3 70 10 )资助

摘　　要：研究了黄土对钕 (Ⅲ )和铈 (Ⅲ )在不同pH下的等温吸附特性 ,采用Langmuir及Freundlich两种吸附模型对吸附数据进行了描述 .并分析、比较了线性及非线性两种拟合的方法 .非线性拟合 ,由于数据形式没有转换 ,求得的模型参数较线性方法比较可靠 ;非线性拟合结果表明 ,在低pH( =3 ,5 75 )下 ,等温吸附行为更符合Langmuir模型 ,而在高pH( =6 1,6 9)下 。the sorption isotherms of neodymium(Ⅲ) and cerium(Ⅲ) on loess were investigated at different pH.Langmuir and Freumdlich models were applied to describe the sorption data.Comparison the methods of liner and non-liner fit,it was suggested that nonlinear-fit was more reliable because there are no transforms of isotherms.The goodness-of-fit,as indicated by sum of the squares of the deviations χ 2,showed that Langmuir model was appropriate at low pH(=3,5.75)while Freundlich model was preferable at high pH(=6.1,6.9).

关 键 词：钕 铈 吸附等温线 黄土 非线性拟合 水体 

分 类 号：O646.14[理学—物理化学]