| 1 | Specific Adsorption of Trivalent La, Ce and Y by Soils and Ferro-manganese Oxides and Its Mechanism显示文摘In this paper,the adsorption-desorption variations of trivalent La,Ce,Y and mixed rare earths are discussed.The curves of pH-rare earth element adsorption were very well fitted to the equation:1nD=a+b pH.The selectivity of RE(rare earth element) ions by the samples decreased in the following order:Ce>RE>La>Y,but the sequences were:La>Ce>Y on kaolinite and Y>La on amorphous iron oxide.Since the trivalent RE ions existed in the form of RE(OH)^2+ in the solutions from pH<5.45 to 7.0,the ratio of H^+ displaced to RE^3+ adsorbed in micromole was proposed to be about 2.The 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. | RANYONG LIUZHENG | 1992 | Pedosphere1992，2，1： | 0 |
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