A new adsorbent, modified mesoporous lanthanum(Ⅲ) silicate, has been prepared with various molar ratios of Si/La (10, 20, 40, 80) and cethyltrimethylammonium bromide (CTAB) as structure directing agent. XRD, nitrogen sorption, SEM, IR, thermogravimetry and sorption of radionuclides and toxic metal ions have been studied. The results show that adsorption amount of some element such as Pb(Ⅱ) and Th(Ⅳ) has been increased significantly by incorporation of lanthanum ions in the framework of adsorbent. Separation of Co(Ⅱ)-Th(Ⅳ), Co(Ⅱ)-U(Ⅵ) and Mo(Ⅵ)-U(Ⅵ) has been developed on columns of this adsorbent.
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