Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization
Pollucite, considered as an ideal host material for immobilization of Cs, rarely exists in pure form but analcime-pollucite solid solution in nature due to the coexistence of Cs and Na in fact. Thus, a novel hydrothermal method has been proposed to directly synthesis analcime-pollucite solid solutio...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2021-01-01
|
| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ac26f4 |
| _version_ | 1797746837907570688 |
|---|---|
| author | Jie Liu Junjie Fan Yafei Zhang Jiajun Miao Mingzhao Cheng Aihua Yao Zhenzi Jing |
| author_facet | Jie Liu Junjie Fan Yafei Zhang Jiajun Miao Mingzhao Cheng Aihua Yao Zhenzi Jing |
| author_sort | Jie Liu |
| collection | DOAJ |
| description | Pollucite, considered as an ideal host material for immobilization of Cs, rarely exists in pure form but analcime-pollucite solid solution in nature due to the coexistence of Cs and Na in fact. Thus, a novel hydrothermal method has been proposed to directly synthesis analcime-pollucite solid solution instead of pure pollucite so as to in-site immobilize Cs in its structure. The result showed that Cs/Na ratio of starting material, hydrothermal time and hydrothermal temperature were the main factors in the hydrothermal synthesis of the solid solution. Different Cs/Na ratio could result in different solid solution formations, and however, even with little polluted Cs in soil (small Cs/Na), the composition of the synthesized solid solution seemed to be closer to that of pollucite than analcime. This suggests that the hydrothermal synthesis of the analcime-pollucite solid solution can be used to immobilize the polluted Cs in soil. The solid solution could be formed readily even at a low curing temperature (150 °C) or for a short curing time (2 h), while a higher temperature and longer time could promote the solid solution formation. The extended X-ray absorption spectrum fine structure (EXAFS) and near-infrared spectrum (NIR) analyses proved that Cs ^+ entered into the structure of the formed solid solutions via replacement of water molecules, and it also led to a distortion of the framework of the solid solution with the change of the Cs–O bond length. This revealed that the Cs was indeed immobilized into the structure like that of pure pollucite. Because of the steady immobilization of Cs in structure, the concentration of Cs leached from the solid solutions was very low (4.3 × 10 ^−6 g/(m ^2 ·d)), even lower than that of the pure pollucite (1.88 × 10 ^−5 g/(m ^2 ·d)) and pollucite-based ceramic (2.67 × 10 ^−3 g/(m ^2 ·d)). Therefore, the hydrothermal synthesis of the analcime-pollucite solid solution from soil (metakaolin) is available for effective treatment of huge amounts of Cs-polluted soil. |
| first_indexed | 2024-03-12T15:42:28Z |
| format | Article |
| id | doaj.art-cb55c7e11d4c45d0a1982fd8215d063e |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:28Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-cb55c7e11d4c45d0a1982fd8215d063e2023-08-09T15:54:38ZengIOP PublishingMaterials Research Express2053-15912021-01-018909551210.1088/2053-1591/ac26f4Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterizationJie Liu0Junjie Fan1Yafei Zhang2Jiajun Miao3Mingzhao Cheng4Aihua Yao5Zhenzi Jing6https://orcid.org/0000-0002-8518-3365Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University , 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaUniversity of Michigan-Shanghai Jiao Tong University Joint Institute , Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of ChinaKey Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University , 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaKey Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University , 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaShanghai HighGood New Materials Technology Co., Ltd, 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaKey Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University , 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaKey Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University , 4800 Cao’an Road, Shanghai 201804, People’s Republic of ChinaPollucite, considered as an ideal host material for immobilization of Cs, rarely exists in pure form but analcime-pollucite solid solution in nature due to the coexistence of Cs and Na in fact. Thus, a novel hydrothermal method has been proposed to directly synthesis analcime-pollucite solid solution instead of pure pollucite so as to in-site immobilize Cs in its structure. The result showed that Cs/Na ratio of starting material, hydrothermal time and hydrothermal temperature were the main factors in the hydrothermal synthesis of the solid solution. Different Cs/Na ratio could result in different solid solution formations, and however, even with little polluted Cs in soil (small Cs/Na), the composition of the synthesized solid solution seemed to be closer to that of pollucite than analcime. This suggests that the hydrothermal synthesis of the analcime-pollucite solid solution can be used to immobilize the polluted Cs in soil. The solid solution could be formed readily even at a low curing temperature (150 °C) or for a short curing time (2 h), while a higher temperature and longer time could promote the solid solution formation. The extended X-ray absorption spectrum fine structure (EXAFS) and near-infrared spectrum (NIR) analyses proved that Cs ^+ entered into the structure of the formed solid solutions via replacement of water molecules, and it also led to a distortion of the framework of the solid solution with the change of the Cs–O bond length. This revealed that the Cs was indeed immobilized into the structure like that of pure pollucite. Because of the steady immobilization of Cs in structure, the concentration of Cs leached from the solid solutions was very low (4.3 × 10 ^−6 g/(m ^2 ·d)), even lower than that of the pure pollucite (1.88 × 10 ^−5 g/(m ^2 ·d)) and pollucite-based ceramic (2.67 × 10 ^−3 g/(m ^2 ·d)). Therefore, the hydrothermal synthesis of the analcime-pollucite solid solution from soil (metakaolin) is available for effective treatment of huge amounts of Cs-polluted soil.https://doi.org/10.1088/2053-1591/ac26f4Analcime-pollucite solid solutionCs immobilizationHydrothermal synthesisSoilMetakaolin |
| spellingShingle | Jie Liu Junjie Fan Yafei Zhang Jiajun Miao Mingzhao Cheng Aihua Yao Zhenzi Jing Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization Materials Research Express Analcime-pollucite solid solution Cs immobilization Hydrothermal synthesis Soil Metakaolin |
| title | Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization |
| title_full | Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization |
| title_fullStr | Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization |
| title_full_unstemmed | Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization |
| title_short | Hydrothermal conversion of analcime-pollucite solid solution from soil for immobilization of Cs in situand its characterization |
| title_sort | hydrothermal conversion of analcime pollucite solid solution from soil for immobilization of cs in situand its characterization |
| topic | Analcime-pollucite solid solution Cs immobilization Hydrothermal synthesis Soil Metakaolin |
| url | https://doi.org/10.1088/2053-1591/ac26f4 |
| work_keys_str_mv | AT jieliu hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT junjiefan hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT yafeizhang hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT jiajunmiao hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT mingzhaocheng hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT aihuayao hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization AT zhenzijing hydrothermalconversionofanalcimepollucitesolidsolutionfromsoilforimmobilizationofcsinsituanditscharacterization |