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Sorption of Eu~(3+) onto nano-size silica-water interfaces

机译:Eu〜(3+)在纳米二氧化硅-水界面的吸附

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The sorption of Eu species onto nano-size silica-water interfaces is investigated at pH range of 1 - 8.5 and the initial Eu concentrations (C_(Eu)) of 2 x 10~(-5), 2 x 10~(-4) and 2 x 10~(-3) M using fluorescence spectroscopy. The sorption rate of Eu is initially low, but significantly increases at pH > 4. For the initial C_(Eu) of 2 x 10~(-5), 2 x 10~(-4) and 2 x 10~(-3) M, the dissolved Eu species are completely sorbed onto silica-water interfaces at pH = 4.75, ~5.8 and 6.6, respectively, with the respective sorption densities of ~1.58 x 10~(-8), 1.58 x 10~(-7) and 1.58 x 10~(-6) mol/m~2. The sorbed Eu species at pH < 6 is aquo Eu~(3+), which is sorbed onto silica-water interfaces as an outer-sphere complex at pH < 5, but may be sorbed as an inner-sphere bidentate complex at 5 < pH < 6, due to the decrease of the N_(H_2o) to ~6 at pH = 6. At pH = 6 - 8, Eu(OH)~(2+), Eu(CO_3)~+ and Eu(CO_3)_2~- form in the solutions, and Eu(CO_3)~+ is dominant at pH = ~7.5. These ions may be sorbed onto silica-water interfaces as inner-sphere bidentate complexes or multi-nuclear precipitates.
机译:研究了在1-8.5的pH范围和2 x 10〜(-5),2 x 10〜(-4)的初始Eu浓度(C_(Eu))下Eu在纳米级二氧化硅-水界面上的吸附情况。 )和2 x 10〜(-3)M的荧光光谱。 Eu的吸附速率最初较低,但在pH> 4时明显增加。对于初始C_(Eu)为2 x 10〜(-5),2 x 10〜(-4)和2 x 10〜(-3 )M,溶解的Eu分别在pH = 4.75,〜5.8和6.6时完全吸附到二氧化硅-水界面上,各自的吸附密度分别为〜1.58 x 10〜(-8),1.58 x 10〜(-7 )和1.58 x 10〜(-6)mol / m〜2。在pH <6时吸附的Eu物质是Eu〜(3+),在pH <5时作为外球络合物被吸附在二氧化硅-水界面上,但在<5时可能作为内球二齿络合物被吸附。 pH <6,因为在pH = 6时N_(H_2o)降低至〜6。在pH = 6-8时,Eu(OH)〜(2 +),Eu(CO_3)〜+和Eu(CO_3)在溶液中形成_2〜-,在pH =〜7.5时Eu(CO_3)〜+占主导。这些离子可能以内球二齿配合物或多核沉淀物的形式吸附到二氧化硅-水界面上。

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