JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Jintao He,Junyuan Hua,Xiaohua Ma,Jianxin Li
The global high-tech industry is experiencing a consistent rise in the demand for cesium. Consequently, it is essential to establish a continuous and energy-efficient method for the recovery of Cs + from aqueous solutions. In this study, a novel supported ionic liquid membrane (SILM) was engineered by incorporating a crown ether-ionic liquid extraction system into the pores of a crown ether-based porous membrane, which was synthesized from 18-crown-6 ether-based polyimide (CE-PI) through non-solvent induced phase separation (NIPS). The findings indicate that the Cs + permeation rate in the SILM system containing free crown ether with a concentration of 0.12 mol/L achieved 3.36 μm/s, representing a 24-fold increase compared to that of the SILM system without free crown ether. When the feed phase comprised mixed ions (K + /Cs + /Rb + ) at a concentration of 50 ppm each, and 0.5 mol/L HCl was used as a stripping phase, the Cs + permeation flux of the SILM system reached 0.233 μg m −2 s −1 , which is substantially greater than that of the competing ions K + (0.001 μg m −2 s −1 ) and Rb + (0.005 μg m −2 s −1 ). The corresponding separation factors (SF) for Cs/K and Cs/Rb in the SILM system were determined to be 10.10 and 7.44, respectively. The high performance of the SILM system is attributed to the ion transport channels established by the free crown ether and ionic liquid within the membrane pores. DFT calculations and MD simulations demonstrated that the free crown ethers in the ionic liquid are instrumental in selectively complexing Cs + owning to their unique chelation interaction (E Cs = −288.5 kJ/mol), thereby promoting the transport of Cs + within the SILM system.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Kaizhong Li,Li Wang,Lei Zhang
The widespread use of nuclear energy has raised concerns about nuclear safety and radioactive waste management, particularly due to the release of radioactive cesium. This study investigates the use of t-BAMBP (4-tert-butyl-2-(α-methylbenzyl) phenol) for the extraction and separation of cesium from simulate high concentration cesium containing wastewater, focusing on the selection of suitable diluents to enhance the efficiency of the process. We performed a systematic study using density functional theory (DFT) calculations to evaluate the intrinsic properties and interactions of various common diluents with t-BAMBP. The diluents studied include aromatic hydrocarbons (benzene, toluene, xylene), alkanes (cyclohexane, hexane, heptane), and alcohols (hexanol, octanol). Our computational results revealed that cyclohexane is the most suitable diluent due to its moderate solvation-free energy, high nonpolarity, and optimal balance between solubility and reactivity. Experimental validation confirmed the computational findings. The cyclohexane-diluted t-BAMBP system achieved the highest cesium extraction efficiency of over 94 %, with a separation factor ( β Cs/K ) of 767.67. Cyclohexane demonstrated the lowest toxicity and cost among the diluents evaluated, making it a safer and more economical choice for practical applications. The results of this study provide a comprehensive theoretical and experimental basis for the selection of diluents in the t-BAMBP extraction system, offering insights for the sustainable utilization of cesium resources and effective management of radioactive waste.
研究领域:
核能安全
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放射性废物管理
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计算化学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Zihao Xu,Meng Rong,Qiyu Meng,Haoyu Yao,Shan Ni,Li Wang,Huifang Xing,Hongnan Qu,Liangrong Yang,Huizhou Liu
In this work, two hypercrosslinked hydroxyl-rich polymers (HCP-P and HCP-R) were facilely prepared through a one-pot Friedel-Crafts polymerization of phenol, resorcinol and formaldehyde dimethyl acetal, respectively. HCP-P and HCP-R were investigated for their ability to separate Cs + from the salt lake brine via ion-exchange reaction between Cs + and O − Na + . The Cs + adsorption isotherms of HCP-P and HCP-R follow the Langmuir model, and their adsorption capacities reach 249.64 mg g −1 and 259.97 mg g −1 , surpassing most of commercial materials like AMP-PAN (81 mg g −1 ) and TAM-5 (191.8 mg g −1 ). The Cs + /K + separation factors (S.F.) of HCPs can reach 12.4 even in the presence of high concentrations of K + (C (K + ) /C (Cs + ) = 712.5). Notably, HCPs could retain more than 90% of the adsorption capacities after 5 successive adsorption-desorption cycles. Besides, X-ray photoelectron spectroscopy (XPS), FT-IR spectra and TEM-EDS analysis revealed the ion exchange mechanism of the Cs + adsorption process. This work demonstrated the excellent application potential of hypercrosslinked hydroxyl-rich polymer adsorbents in separating Cs + from the salt lake brine.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Sun Hai-Yan,Chen Zhi-Hua,Hu Bing,Tang Jun-Hao,Yang Lu,Guo Yan-Ling,Yao Yue-Xin,Feng Mei-Ling,Huang Xiao-Ying
Selective separation of 137 Cs is significant for the sustainable development of nuclear energy and environmental protection, due to its strong radioactivity and long half-life. However, selective capture of 137 Cs + from radioactive liquid waste is challenging due to strong coulomb interactions between the adsorbents and high-valency metal ions. Herein, we propose a strategy to resolve this issue and achieve specific Cs + ion recognition and separation by modulating the stacking modes of layered perovskites. We demonstrate that among niobate-based perovskites, A LaNb 2 O 7 ( A = Cs, H, K, and Li), HLaNb 2 O 7 shows an outstanding selectivity for Cs + even in the presence of a large amount of competing M n+ ions ( M n+ = K + , Ca 2+ , Mg 2+ , Sr 2+ , Eu 3+ , and Zr 4+ ) owing to its suitable void fraction and space shape, brought by the stacking mode of layers. The Cs + capture mechanism is directly elucidated at molecular level by single-crystal structural analyses and density functional theory calculations. This work not only provides key insights in the design and property optimization of perovskite-type materials for radiocesium separation, but also paves the way for the development of efficient inorganic materials for radionuclides remediation.
研究领域:
材料科学
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环境科学
·
核能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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