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Luo W, Yang X, Cao H, Weng L, Feng G, Fu XZ, Luo JL, Liu J. Unravelling the origin of long-term stability for Cs + and Sr 2+ solidification inside sodalite. Phys Chem Chem Phys 2022; 24:18083-18093. [PMID: 35876809 DOI: 10.1039/d1cp04164a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Cesium (Cs+) and strontium (Sr2+) ions are the main fission byproducts in the reprocessing of spent nuclear fuels for nuclear power plants. Their long half-live period (30.17 years for 137Cs and 28.80 years for 90Sr) makes them very dangerous radionuclides. Hence the solidification of Cs+ and Sr2+ is of paramount importance for preventing them from entering the human food chain through water. Despite tremendous efforts for solidification, the long-term stability remains a great challenge due to the experimental limitation and lack of good evaluation indicators for such long half-life radionuclides. Using density functional theory (DFT), we investigate the origin of long-term stability for the solidification of Cs+ and Sr2+ inside sodalite and establish that the exchange energy and the diffusion barrier play an important role in gaining the long-term stability both thermodynamically and kinetically. The acidity/basicity, solvation, temperature, and diffusion effect are comprehensively studied. It is found that solidification of Cs+ and Sr2+ is mainly attributed to the solvation effect, zeolitic adsorption ability, and diffusion barriers. The present study provides theoretical evidence to use geopolymers to adsorb Cs+ and Sr2+ and convert the adsorbed geopolymers to zeolites to achieve solidification of Cs+ and Sr2+ with long-term stability.
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Affiliation(s)
- Wenzhi Luo
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China.
| | - Xiaoqiang Yang
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China.
| | - Hailin Cao
- College of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518000, P. R. China
| | - Luqian Weng
- Shenzhen Aerospace New Materials Technology Cooperation, Shenzhen, P. R. China
| | - Gang Feng
- Institute of Applied Chemistry, College of Chemistry, Nanchang University, No. 999 Xuefu Road, Nanchang 330031, P. R. China
| | - Xian-Zhu Fu
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China.
| | - Jing-Li Luo
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China.
| | - Jianwen Liu
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China.
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Effect of Nature of Heteroelement (Ba, Ga, Al) on Adsorption and Acid Characteristics of Hierarchical Porous Zeolites of MOR, BEA, and MTW Structural Types. THEOR EXP CHEM+ 2018. [DOI: 10.1007/s11237-018-9539-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Density Functional Theory Investigation into the B and Ga Doped Clean and Water Covered γ-Alumina Surfaces. J CHEM-NY 2017. [DOI: 10.1155/2017/6215315] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The structures and energies of the B and Ga incorporated γ-alumina surface as well as the adsorption of water are investigated using dispersion corrected density functional theory. The results show that the substitution of surface Al atom by B atom is not so favored as Ga atom. The substitution reaction prefers to occur at the tricoordinated A(4) sites. However, the substitution reaction becomes less thermodynamically favored when more Al atoms are substituted by B and Ga atoms on the surface. Moreover, the substitution of bulk Al atoms is not so favored as the Al atoms by B and Ga on the surface. The γ-alumina surface is found to have stronger adsorption ability for water than the B and Ga incorporated surface. The total adsorption energy increases as water coverage increases, while the stepwise adsorption energy decreases. The studies show the coverage of water at 7.5 H2O/nm2 (five H2O molecules per unit cell) can fully cover the active sites and the further water molecule could only be physically adsorbed on the surface.
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Qi Y, Gao J, Zhang D, Liu C. Comparative theoretical study of formic acid decomposition on PtAg(111) and Pt(111) surfaces. RSC Adv 2015. [DOI: 10.1039/c5ra01925g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This theoretical study compares the catalytic decomposition pathways of HCOOH on pure Pt surface with the ideal single-atom model catalyst of PtAg nanostructures.
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Affiliation(s)
- Yuanyuan Qi
- Key Lab of Colloid and Interface Chemistry
- Ministry of Education
- Institute of Theoretical Chemistry
- Shandong University
- Jinan
| | - Jun Gao
- Key Lab of Colloid and Interface Chemistry
- Ministry of Education
- Institute of Theoretical Chemistry
- Shandong University
- Jinan
| | - Dongju Zhang
- Key Lab of Colloid and Interface Chemistry
- Ministry of Education
- Institute of Theoretical Chemistry
- Shandong University
- Jinan
| | - Chengbu Liu
- Key Lab of Colloid and Interface Chemistry
- Ministry of Education
- Institute of Theoretical Chemistry
- Shandong University
- Jinan
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Wen C, Geng L, Han L, Wang J, Chang L, Feng G, Kong D, Liu J. A comparative first principles study on trivalent ion incorporated SSZ-13 zeolites. Phys Chem Chem Phys 2015; 17:29586-96. [DOI: 10.1039/c5cp04788a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dispersion-corrected density functional theory has been used to study the trivalent ions B, Al, Ga, and Fe incorporated SSZ-13-type zeolites.
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Affiliation(s)
- Cui Wen
- College of Materials Science and Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Lu Geng
- College of Materials Science and Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Lina Han
- College of Materials Science and Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Jiancheng Wang
- Key Laboratory of Coal Science and Technology
- Ministry of Education and Shanxi Province
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Liping Chang
- Key Laboratory of Coal Science and Technology
- Ministry of Education and Shanxi Province
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Gang Feng
- College of Chemistry
- Nanchang University
- Nanchang
- P. R. China
- Shanghai Research Institute of Petrochemical Technology SINOPEC
| | - Dejin Kong
- Shanghai Research Institute of Petrochemical Technology SINOPEC
- Shanghai
- P. R. China
| | - Jianwen Liu
- National Supercomputing Center in Shenzhen
- Shenzhen
- P. R. China
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Liu J, Lv C, Jin C, Guo Y, Wang G. Adsorption and decomposition of methylamine on a Pt(100) surface: a density functional theory study. RSC Adv 2015. [DOI: 10.1039/c4ra16308g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The decomposition of methylamine was investigated on a Pt(100) surface using DFT, and it was found that the C–N bond was not broken.
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Affiliation(s)
- Jianhong Liu
- College of Chemistry and Enviromental Engineering
- Shanxi Datong University
- Daong 037009
- P. R. China
| | - Cunqin Lv
- College of Chemistry and Enviromental Engineering
- Shanxi Datong University
- Daong 037009
- P. R. China
| | - Chun Jin
- College of Chemistry and Enviromental Engineering
- Shanxi Datong University
- Daong 037009
- P. R. China
| | - Yong Guo
- College of Chemistry and Enviromental Engineering
- Shanxi Datong University
- Daong 037009
- P. R. China
| | - Guichang Wang
- College of Chemistry and Enviromental Engineering
- Shanxi Datong University
- Daong 037009
- P. R. China
- Department of Chemistry and the Center of Theoretical Chemistry Study
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