Effects of iron corrosion products on the degradation of bentonite structure and properties
Abstract Bentonite is a key material for engineering barriers to prevent groundwater and nuclide migration in the multi-barrier system of high-level radioactive waste (HLW) geological disposal. However, its barrier property will be degraded under the action of iron corrosion products of steel dispos...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-08-01
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| Series: | npj Materials Degradation |
| Online Access: | https://doi.org/10.1038/s41529-023-00380-3 |
| _version_ | 1797451896373379072 |
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| author | Yupeng Sun Yangtao Zhou Xin Wei Junhua Dong Nan Chen Qiying Ren Junhu Wang Wei Ke |
| author_facet | Yupeng Sun Yangtao Zhou Xin Wei Junhua Dong Nan Chen Qiying Ren Junhu Wang Wei Ke |
| author_sort | Yupeng Sun |
| collection | DOAJ |
| description | Abstract Bentonite is a key material for engineering barriers to prevent groundwater and nuclide migration in the multi-barrier system of high-level radioactive waste (HLW) geological disposal. However, its barrier property will be degraded under the action of iron corrosion products of steel disposal containers. In this paper, the effects of iron corrosion products on the degradation of bentonite structure and properties were investigated in the simulated environments for HLW geological disposal. The results showed that Fe2+/Fe3+ dissolved from iron powder could enter montmorillonite (Mt) interlayer and substituted part of Na+, which caused the decrease of the volume and interlayer spacing of Mt, and the structural integrity of Mt was destroyed. Macroscopically, the water absorption and swelling property of bentonite were significantly decreased. The degradation mechanism of Mt structure was mainly that Fe2+/Fe3+ generated by iron corrosion entered the interlayer domain of Mt to compensate for the interlayer charge deficit. |
| first_indexed | 2024-03-09T15:01:03Z |
| format | Article |
| id | doaj.art-73d083c450074b188ae6d2a9d558756c |
| institution | Directory Open Access Journal |
| issn | 2397-2106 |
| language | English |
| last_indexed | 2024-03-09T15:01:03Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Materials Degradation |
| spelling | doaj.art-73d083c450074b188ae6d2a9d558756c2023-11-26T13:53:51ZengNature Portfolionpj Materials Degradation2397-21062023-08-017111110.1038/s41529-023-00380-3Effects of iron corrosion products on the degradation of bentonite structure and propertiesYupeng Sun0Yangtao Zhou1Xin Wei2Junhua Dong3Nan Chen4Qiying Ren5Junhu Wang6Wei Ke7School of Materials Science and Engineering, University of Science and Technology of ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesCenter for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of SciencesEnvironmental Corrosion Centre of Materials, Institute of Metal Research, Chinese Academy of SciencesAbstract Bentonite is a key material for engineering barriers to prevent groundwater and nuclide migration in the multi-barrier system of high-level radioactive waste (HLW) geological disposal. However, its barrier property will be degraded under the action of iron corrosion products of steel disposal containers. In this paper, the effects of iron corrosion products on the degradation of bentonite structure and properties were investigated in the simulated environments for HLW geological disposal. The results showed that Fe2+/Fe3+ dissolved from iron powder could enter montmorillonite (Mt) interlayer and substituted part of Na+, which caused the decrease of the volume and interlayer spacing of Mt, and the structural integrity of Mt was destroyed. Macroscopically, the water absorption and swelling property of bentonite were significantly decreased. The degradation mechanism of Mt structure was mainly that Fe2+/Fe3+ generated by iron corrosion entered the interlayer domain of Mt to compensate for the interlayer charge deficit.https://doi.org/10.1038/s41529-023-00380-3 |
| spellingShingle | Yupeng Sun Yangtao Zhou Xin Wei Junhua Dong Nan Chen Qiying Ren Junhu Wang Wei Ke Effects of iron corrosion products on the degradation of bentonite structure and properties npj Materials Degradation |
| title | Effects of iron corrosion products on the degradation of bentonite structure and properties |
| title_full | Effects of iron corrosion products on the degradation of bentonite structure and properties |
| title_fullStr | Effects of iron corrosion products on the degradation of bentonite structure and properties |
| title_full_unstemmed | Effects of iron corrosion products on the degradation of bentonite structure and properties |
| title_short | Effects of iron corrosion products on the degradation of bentonite structure and properties |
| title_sort | effects of iron corrosion products on the degradation of bentonite structure and properties |
| url | https://doi.org/10.1038/s41529-023-00380-3 |
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