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Du Y, Fu X, Zhou Q, Zhao J, Wu H, Li X, Liu Y, Le Z. Preparation of zero-valent iron-nickle bimetallic composite for Se(IV) adsorption from aqueous solution. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-023-08789-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Lee CP, Hu Y, Sun Y, Shi Y, Tien NC, Chuang LY, Liu W. Experimental investigation on buffer/backfill materials for radioactive waste repository downward facing sorption additivity of cesium, strontium and cobalt with different concentrations. KERNTECHNIK 2021. [DOI: 10.1515/kern-2021-1002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Buffer/backfill materials for radioactive waste disposal sites consist of pure bentonite or bentonite-rock mixtures. In this study, the batch test method was used to obtain the sorption characteristics of important radionuclides such as Cs, Sr and Co on buffer/backfill materials; i. e., mixing Wyoming MX-80 bentonite or local Taiwanese Zhi-Shin bentonite with possible host rock (argillite and granite) in different proportions (0∼100%). The distribution coefficients (Kd) for Cs, Sr and Co were obtained from the experiments. The distribution coefficient for the bentonite-rock mixtures were found, with more than 50% of mixing proportion of bentonite to argillite or granite, to have very similar values to that of pure bentonite. Furthermore, it was clearly found that the sorption of Cs, Sr and Co to bentonite-rock mixtures is decreased as ionic strength of the liquid phase is increased from 0.001M to 1M for NaCl solutions. According to the experimental results, in synthetic groundwater, it is quite convenient and helpful to assess the distribution coefficients (Kd) of Cs, Sr and Co for buffer/backfill materials using batch sorption experiments with bentonite-rock mixtures of fixed mixing proportions.
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Affiliation(s)
- C.-P. Lee
- School of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Y. Hu
- School of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Y. Sun
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Y. Shi
- School of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
- Department of Nuclear Environmental Science, China Institute for Radiation Protection (CIRP) , Taiyuan 030006 , China
| | - N.-C. Tien
- Nuclear Science and Technology Development Center, National Tsing Hua University , Hsinchu 30013 , Taiwan R.O.C
| | - L.-Y. Chuang
- School of Education, Zhaoqing University , Guangdong , China
| | - W. Liu
- School of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
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Li Y, He J, Zhou W, Shi Y, Wang J, Xian D, Liu C. Influence of colloids and colloids’ coagulation on selenite sorption. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Puhakka E, Li X, Ikonen J, Siitari-Kauppi M. Sorption of selenium species onto phlogopite and calcite surfaces: DFT studies. JOURNAL OF CONTAMINANT HYDROLOGY 2019; 227:103553. [PMID: 31623864 DOI: 10.1016/j.jconhyd.2019.103553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 09/10/2019] [Accepted: 09/10/2019] [Indexed: 06/10/2023]
Abstract
Sorption of Se(IV) and Se(VI) species onto Mg-rich biotite (phlogopite) and calcite surfaces was investigated using molecular modelling techniques. A CASTEP code implemented into Materials Studio was used to calculate the periodic systems, site densities and site types on the phlogopite and calcite surfaces. According to the results, the Se oxyanions attach to both edge and basal surfaces of phlogopite via an oxygen atom. However, calculated sorption energies indicate that surface complexation reactions via hydrogen bonding happen on the edge surfaces of phlogopite while cation exchange reactions happen on the basal surfaces of phlogopite. These reactions occur on the so-called weak sites according to the PHREEQC modelling. On the calcite surface, only cation exchange reactions are possible, and only for neutral Se species which do not occur in low saline groundwater conditions with pH 8-10. Biotite which is an abundant mineral in crystalline rock works fairly well as a sorbent but calcite which often exists on fracture surfaces of bedrock does not act as a sorbent for Se species.
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Affiliation(s)
- Eini Puhakka
- Department of Chemistry, P.O. Box 55, FI-00014, University of Helsinki, Finland
| | - Xiaodong Li
- Department of Chemistry, P.O. Box 55, FI-00014, University of Helsinki, Finland.
| | - Jussi Ikonen
- Department of Chemistry, P.O. Box 55, FI-00014, University of Helsinki, Finland
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Yang X, Ge X, He J, Wang C, Qi L, Wang X, Liu C. Effects of Mineral Compositions on Matrix Diffusion and Sorption of 75Se(IV) in Granite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:1320-1329. [PMID: 29287146 DOI: 10.1021/acs.est.7b05795] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Exploring the migration behaviors of selenium in granite is critical for the safe disposal of radioactive waste. The matrix diffusion and sorption of 75Se(IV) (analogue for 79Se) in granite were systematically studied to set reliable parameters in this work. Through-diffusion and batch sorption experiments were conduct with four types of Beishan granite. The magnitudes of the obtained apparent diffusion coefficient (Da) values are of the following order: monzogranite > granodiorite-2 > granodiorite-1, which is opposite to the sequence of the Kd values obtained from both the diffusion model and batch sorption experiments. The EPMA results of the granitic flakes showed that there was no obvious enrichment of Se(IV) on quartz, microcline and albite. Only biotite showed a weak affinity for Se(IV). Macroscopic sorption behaviors of Se(IV) on the four types of granite were identical with the sequence of the granitic biotite contents. Quantitative fitting results were also provided. XPS and XANES spectroscopy data revealed that bidentate inner-sphere complexes were formed between Se(IV) and Fe(III). Our results indicate that biotite can be representative of the Se(IV) sorption in complex mineral assemblages such as granite, and the biotite contents are critically important to evaluate Se(IV) transport in granite.
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Affiliation(s)
- Xiaoyu Yang
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
| | - Xiangkun Ge
- Analtical Laboratory, Beijing Research Institute of Uranium Geology , Beijing, 100029, China
| | - Jiangang He
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
| | - Chunli Wang
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
- Nuclear and Radiation Safety Center , Beijing, 100082, China
| | - Liye Qi
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
| | - Xiangyun Wang
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China
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Söderlund M, Virkanen J, Holgersson S, Lehto J. Sorption and speciation of selenium in boreal forest soil. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 164:220-231. [PMID: 27521902 DOI: 10.1016/j.jenvrad.2016.08.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 08/03/2016] [Accepted: 08/04/2016] [Indexed: 06/06/2023]
Abstract
Sorption and speciation of selenium in the initial chemical forms of selenite and selenate were investigated in batch experiments on humus and mineral soil samples taken from a 4-m deep boreal forest soil excavator pit on Olkiluoto Island, on the Baltic Sea coast in southwestern Finland. The HPLC-ICP-MS technique was used to monitor any possible transformations in the selenium liquid phase speciation and to determine the concentrations of selenite and selenate in the samples for calculation of the mass distribution coefficient, Kd, for both species. Both SeO32- and SeO42- proved to be resistant forms in the prevailing soil conditions and no changes in selenium liquid phase speciation were seen in the sorption experiments in spite of variations in the initial selenium species, incubation time or conditions, pH, temperature or microbial activity. Selenite sorption on the mineral soil increased with time in aerobic conditions whilst the opposite trend was seen for the anaerobic soil samples. Selenite retention correlated with the contents of organic matter and weakly crystalline oxides of aluminum and iron, solution pH and the specific surface area. Selenate exhibited poorer sorption on soil than selenite and on average the Kd values were 27-times lower. Mineral soil was more efficient in retaining selenite and selenate than humus, implicating the possible importance of weakly crystalline aluminum and iron oxides for the retention of oxyanions in Olkiluoto soil. Sterilization of the soil samples decreased the retention of selenite, thus implying some involvement of soil microbes in the sorption processes or a change in sample composition, but it produced no effect for selenate. There was no sorption of selenite by quartz, potassium feldspar, hornblende or muscovite. Biotite showed the best retentive properties for selenite in the model soil solution at about pH 8, followed by hematite, plagioclase and chlorite. The Kd values for these minerals were 18, 14, 8 and 7 L/kg, respectively. It is proposed that selenite sorption is affected by the structural Fe(II) in biotite, which is capable of inducing the reduction of SeO32- to Se(0). Selenite probably forms a surface complex with Fe(III) atoms on the surface of hematite, thus explaining its retention on this mineral. None of the minerals retained selenate to any extent.
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Affiliation(s)
- Mervi Söderlund
- Laboratory of Radiochemistry, Department of Chemistry, P.O. BOX 55, FIN-00014 University of Helsinki, Finland.
| | - Juhani Virkanen
- Department of Geosciences and Geography, P.O. Box 64, FIN-00014 University of Helsinki, Finland.
| | - Stellan Holgersson
- Nuclear Chemistry, Department of Chemical Engineering, Chalmers University of Technology, Kemivägen 4, SE-41296 Gothenburg, Sweden.
| | - Jukka Lehto
- Laboratory of Radiochemistry, Department of Chemistry, P.O. BOX 55, FIN-00014 University of Helsinki, Finland.
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