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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 (CEu) of 2 × 10?5, 2 × 10?4 and 2 × 10?3 M using fluorescence spectroscopy. The sorption rate of Eu is initially low, but significantly in-creases at pH > 4. For the initial CEu of 2 × 10?5, 2 × 10?4 and 2 × 10?3 M, the dissolved Eu spe-cies 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 × 10?8, 1.58 × 10?7 and 1.58 × 10?6 mol/m2. The sorbed Eu species at pH < 6 is aquo Eu3+, 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 NH2O to ~6 at pH = 6. At pH = 6 – 8, Eu(OH)2+, Eu(CO3)+ and Eu(CO3)2? form in the solutions, and Eu(CO3)+ is dominant at pH = ~7.5. These ions may be sorbed onto silica-water interfaces as inner-sphere bidentate complexes or multi-nuclear pre-cipitates.
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 (CEu) of 2 × 10 -5, 2 × 10 -4 and 2 × 10 -3 M using The sorption rate of Eu is initially low, but significantly in-creases at pH> 4. For the initial CEu of 2 × 10 -5, 2 × 10 -4 and 2 × 10 -3 M, the dissolved Eu spence -cies 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 × 10 ~ 8, 1.58 × 10 ~ 7 and 1.58 × 10 ~ 6 mol / m2. The sorbed Eu species at pH <6 is aquo Eu3 +, 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
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