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| Sorption of Eu~(3+) onto nano-size silica-water interfaces | |
| 作者姓名： | HU Ping YIN Xiulan ZHAO Linghu & LI Dien . |
| 作者单位： | HU Ping1，2，YIN Xiulan3，ZHAO Linghu1 & LI Dien4 1. Department of Earth Sciences，China University of Geosciences，Wuhan 430074，China; 2. Northeastern Illinois University，Chicago，IL 60625，USA; 3. China Institute of Geo-Environmental Monitoring，Beijing 100081，China; 4. Division of Chemistry，Los Alamos National Laboratory，Los Alamos，NM 87544，USA |
| 摘 要： | A large amount of nuclear wastes has been pro-duced due to nuclear weapon development and nuclear electricity generation. One possible resolution for the disposal of the nuclear wastes is to seal them in an underground repository, which requires detailed knowledge on the mobility, chemical behavior and immobilization of radionuclides in underground water. In addition, toxic heavy metals are extensively present in ground and underground water, how to immobilize and remedy these toxic heavy meta… |
Sorption of Eu3+ onto nano-size silica-water interfaces |
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| HU Ping,,YIN Xiulan,ZHAO Linghu & LI Dien ..Sorption of Eu~(3+) onto nano-size silica-water interfaces[J].Science in China(Earth Sciences),2005,48(11). | |
| Authors: | HU Ping YIN Xiulan ZHAO Linghu LI Dien |
| Institution: | 1. Department of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Northeastern Illinois University, Chicago, IL 60625, USA 2. China Institute of Geo-Environmental Monitoring, Beijing 100081, China 3. Department of Earth Sciences, China University of Geosciences, Wuhan 430074, China 4. Division of Chemistry, Los Alamos National Laboratory, Los Alamos, NM 87544, USA |
| Abstract: | 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 increases at pH > 4. For the initial CEu of 2 × 10-5, 2 × 10-4 and 2 × 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 × 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 precipitates. |
| Keywords: | surface sorption Eu3+ species nano-size silica fluorescence spectroscopy immobilization of toxic metals |
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