Specific Adsorption of Trivalent La, Ce and Y by Soils and Ferro-manganese Oxides and Its Mechanism

作     者：RANYONG LIUZHENG 

作者机构：InstituteofSoilScienceAcademiaSinicaP.O.Box821Nanjing210008（China） InstituteofSoilScienceAcademia 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：1992年第2卷第1期

页      面：13-22页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

主　　题：镧 钇 氧化物 稀土元素 铁锰合金 吸附作用 作用机理 土壤 解吸附作用 Shi 

摘      要：In this paper,the adsorption-desorption variations of trivalent La,Ce,Y and mixed rare earths are *** curves of pH-rare earth element adsorption were very well fitted to the equation:1nD=a+b *** selectivity of RE(rare earth element) ions by the samples decreased in the following order:CeRELaY,but the sequences were:LaCeY on kaolinite and YLa on amorphous iron *** the trivalent RE ions existed in the form of RE(OH)^2+ in the solutions from pH5.45 to 7.0,the ratio of H^+ displaced to RE^3+ adsorbed in micromole was proposed to be about *** specific adsorption mechanism for RE was proposed to be that the RE ions complexed with oxide surface and the ion-surface complex of Ce^3+ promoted oxidization on Mn hydroxide.