Nuclear Engineering and Technology
·
2021
·
IF 2.341
Hao Wu,Tatsuya Kudo,Seong-Yun Kim,Misako Miwa,Shigeo Matsuyama
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C 2 mim + NTf 2 − ) as the materials to remove cesium(I) (Cs + ) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs + ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs + adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs + and C 2 mim + . In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs + ion species on the adsorbent was in the form of both CsCl and CsBr.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Shengjian Zhao,Hualong Yang,Xuehui Liu,Siqi Ma,Peigang He,Zhenlin Sun,Dechang Jia,Paolo Colombo,Yu Zhou
Metakaolin-based geopolymers are very promising materials for improving the safety of low and intermediate level radioactive waste disposal, with respect to ordinary Portland cement , due to their excellent immobilization performance for Cs + and superior chemical stability. However, their application is limited by the fact that the leaching behavior of Cs + is susceptible to the presence of other ions in the environment. Here, we propose a way to modify a geopolymer using perfluorodecyltriethoxysilane (PDFS), successfully reducing the leaching rate of Cs + in the presence of multiple competitive cations due to blocking the diffusion of water. The leachability index of the modified samples in deionized water and highly concentrated saline water reached 11.0 and 8.0, respectively. The reaction mechanism between PDFS and geopolymers was systematically investigated by characterizing the microstructure and chemical bonding of the material. This work provides a facile and successful approach to improve the immobilization of Cs ions by geopolymers in real complex environments, and it could be extended to further improve the reliability of geopolymers used in a range of applications.
研究领域:
材料科学
·
放射性废物管理
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Xue Yang,Mengyu Lin,Jiumei Chu,Dianquan Dong
The unique properties of cesium compounds have garnered increasing attention, among which Cs 2 Ti 6 O 13 shows great potential for applications. This paper synthesized Cs 2 Ti 6 O 13 (CTO-3) using a template-assisted solvothermal method with cesium carbonate as the cesium source and tetrabutyl titanate as the titanium source. Among them, F127 and hexadecylamine are used as template agents to modulate the surface morphology and hydrophilicity of the precursor. The cesium ion sieve H 2 Ti 6 O 13 (HTO-3) synthesized after hydrochloric acid pickling has a large specific surface area and good hydrophilicity. This structure is conducive to the ion exchange between Cs + and H + , resulting in a fast adsorption rate. It is completed within 2 h, and the adsorption capacity reaches 360 mg/g, which is significantly greater than that of the traditional high-temperature solid-phase method. The adsorption process of Cs + on HTO-3 is more consistent with the pseudo-second-order kinetic equation model, and the adsorption process is chemical adsorption. HTO-3 exhibited good selectivity and cycle stability. At the fifth time of the adsorption-resolution cycle, the adsorption capacity was 87.1 % of the first time.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Advanced Sensor Research
·
2024
·
IF 0
Wei Ye,Yaxin Li,Xinyu Zhao,Yaocheng Yang,Xin Wang,Dongqing He,Lu Li,Dongyan Tang,Tengling Ye
This study introduces a novel fluorescent light-up electrospun membrane, integrating PbBr 2 , which serves as an exceptionally selective probe for the detection of cesium ions (Cs + ). Leveraging the superior optical properties of CsPbBr 3 perovskite nanocrystals (PNCs), the researchers employ electrospinning technology to fabricate a test strip, namely PbBr 2 @polyacrylonitrile (PbBr 2 @PAN) nanofiber membranes, capable of swiftly detecting Cs + in water merely by observing changes in the nanocrystals' luminescence with the naked eye. By the introduction of NH 4 + -modified montmorillonite (NH 4 + -MMT), PbBr 2 -MT@PAN nanofiber membranes is obtained. The selectivity and sensitivity to Cs + can be further improved because NH 4 + -MMT endows PbBr 2 -MT@PAN nanofiber membranes with the hydrophilic property and selective adsorption toward Cs + ions. The membrane's fabrication is simple, scalable, and cost-effective, with high cesium selectivity and sensitivity down to 44 ppb. This innovation enables efficient, on-site cesium monitoring critical for environmental safety and nuclear waste management.
研究领域:
分析化学
·
材料科学
·
环境监测
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Haiyan Zhou,Ying Dai,Di Zhang,Jesse Daniel,Xing Zhong,Zhuyao Li,Qinqin Tao,Lei Xu
A novel chitosan (CTS) - based composite material, CTS/B18C6/B21C7, has been developed through the Schiff base reaction, incorporating two distinct crown ether ligands - aldehyde-benzo-18-crown-6 (B18C6) and aldehyde-benzo-21-crown-7 (B21C7). This design enables efficient and selective adsorption of cesium and strontium. The material features two recognition sites of exclusive affinity, enhancing selective adsorption through the matching cavity sizes of the crown ethers with Sr 2+ and Cs + . The structure and surface properties were characterized using SEM, TG, FT-IR and XPS confirming the successful Schiff base reaction and effective material synthesis. Adsorption experiments revealed that CTS/B18C6/B21C7 exhibited strong affinity and high adsorption capacity for Sr 2+ and Cs + . Under strong acid conditions (pH < 1), the adsorption strength increased, and higher acidity further enhanced adsorption capacity, indicating that electrostatic and other interactions play significant roles in the adsorption process. The Sips isothermal model was more suitable for describing this adsorption process, with maximum adsorption capacities of 172.11 mg/g for Cs + and 132.23 mg/g for Sr 2+ determined. These findings highlight the potential application of CTS/B18C6/B21C7 in treating radioactive nuclides.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Liu Yao,Chen Jinzheng,Miao Yiling,Zhang Kaimin,Lin Faxu,Huang Huahua,Zhang Lina,Yang Zhan,Zhang Yi,Chi Zhenguo,Yang Zhiyong
Despite great achievements obtained for polymer-based room-temperature phosphorescence (RTP) materials, the limited efficiencies of persistent RTP still hinder their development. Herein, a simple and universal strategy of using the dual-functional additive of Cs + was presented, which could simultaneously enhance the efficiency ( Φ p ) and maintain the long lifetime ( τ p ) of RTP in existing polymer-based systems with various phosphors and polymers. Among them, the commercial emitter (TpB)-doped polyvinyl alcohol (PVA)/Cs 2 CO 3 system possessed an extremely high Φ p up to 75.5% and still maintained a long τ p of 2.13 s, by introducing the heavy-atom effect and an extra network of ionic bonding through the Cs + additive. Additionally, the temperature resistance of RTP in TpB@PVA/Cs + film could also be improved to 85 °C. More satisfactorily, the efficiency of Förster resonance energy transfer (FRET) from RTP to near-infrared (NIR) was also remarkably enhanced in the multi-component systems. This work provides a simple and universal strategy for developing polymer systems with high RTP performance.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Zhenzhen Jiang,Gaoling Liu,Chi Ma,Yafei Guo,Ji Duo,Mingli Li,Tianlong Deng
Efficient and quick removal of radioactive Cs + from wastewater is significant for the safe use of nuclear energy and human health. A novel adsorbent K 1.93 Ti 0.22 Sn 3 S 6.43 (KTSS) was developed for Cs + removal from complex natural water systems. The working mechanism of KTSS for removing Cs + was the synergistic effect of ion exchange and the Cs⋯S binding, which was proved by several characterization techniques. KTSS showed ultrafast kinetics for Cs + adsorption within 1 min with a removal rate of 99%. Meanwhile, KTSS exhibited a higher adsorption capacity of 450.12 mg/g than many other adsorbents to remove Cs + and possessed excellent chemical stability in a wide pH range of 3–12. Thanks to the natural affinity arising from the S 2− ligands, KTSS displayed excellent selectivity for Cs + even in different complex water systems. The separation factors between Cs + and the coexisting ions of Na + , K + , Mg 2+ , Ca 2+ were ranged from 408.61 to 7448.20. Fortunately, by eluting with NaNO 3 the adsorbent could realize the green regeneration and cyclic utilization. Furthermore, it was found that KTSS had tremendous advantages in the removal of Cs + in comparison with the other adsorbents. Consequently, it should be considered that KTSS obtained in this study has great potential in applying ultrafast and high-efficient removal of Cs + from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Hao Fang,Lu Yang,Jie Ni,Shanshan Feng,Wenhao Jia,Na Li,Xiaoyi Ma,Zhengwei Zhou,Yao Zhang,Sheng Feng
This study developed an innovative adsorbent—cobalt ferrocyanide/ZIF-67/aged garbage humus soil aerogel (PBA/ZIF-67/AARH aerogel)—specifically designed for the effective removal of cesium ions (Cs) from radioactive wastewater. The aerogel exhibited a maximum adsorption capacity of up to 51.92 mg/g, maintaining excellent Cs adsorption performance even in complex aquatic environments that contain other ions and dissolved organic matter (DOM). The experimental results showed that the adsorption effect of PBA/ZIF-67/AARH aerogel was the best when the dosage of PBA/ZIF-67/AARH aerogel was 0.01 g and pH value was 5. The adsorption capacity was 29.75 ± 0.5 mg/g. At the same time, PBA/ZIF-67/AARH aerogel has good regeneration stability. After five sorption-desorption cycles, the adsorption capacity is 20.1 ± 0.3 mg/g, and the Cs removal rate remains at 84.5 ± 0.5%. The PBA/ZIF-67/AARH aerogel also has a large specific surface area, reaching 30.7950 m 2 /g. Experimental analyses indicated that the Cs removal process aligns with both the Langmuir adsorption model and pseudo-second-order kinetics, revealing key mechanisms for adsorption efficiency, including ion exchange, functional group complexation, and the synergistic effects of cross-linking. This research provides a novel solution for the efficient removal of Cs, establishing a solid theoretical and practical foundation for future applications in pollution water treatment technologies. It holds significant potential for environmental protection and profound implications for human health.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yaqin Rong,Shuai Li,Junjian Niu,Zhongde Wang,Xiaogang Hao,Chengwen Song,Tonghua Wang,Guoqing Guan
Radioactive cesium ( 137 Cs) ions exhibit high-energy gamma radiation and long half-life. When they enter water body, serious environmental problems and damage to the human body are always generated. Herein, an electroactive composite membrane was facilely prepared by uniformly deposition of nickel hexacyanoferrate (NiHCF) nanoparticles on the surface and inner wall of coal-based tubular carbon membrane (CTCM) for rapid and selective separation of Cs + from wastewater. This NiHCF incorporated CTCM tube exhibited an extremely high removal rate (over 99.99%) over a long period. Meanwhile, it also demonstrated extreme Cs + selectivities even in the solutions with high coexisting ion concentrations (e.g., Cs + :Na + = 1:99, Cs + :K + = 1:99). The rapid and selective Cs + uptake/release should be attributed to the better dispersion of NiHCF nanoparticles with high selectivity to Cs + in the CTCM tube, which reduced the mass transfer distance, increased fluid turbulence and accelerated mass transfer rate. It is expected that such a NiHCF incorporated CTCM tube could be a promising alternative of conventional materials for the separating of radioactive Cs + ions.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·737-748
·
IF 1.186
Feng Sheng,Ni Ziqiu,Feng Shanshan,Zhang Zhihui,Liu Shuguang,Wang Runbai,Hu Jiawei
In this study, the UiO-66/Fe 3 O 4 /GO composite was prepared by one step method for removal of cesium ions (Cs + ) in water and exhibited excellent adsorption capacity for Cs + (62.07 mg g −1 ), which can be attributed to the size compatibility of nanosized cavities and the addition of GO. As supporting matrix, GO decreased particle aggregation and increased the surface area of the adsorbent. The composite had good acid and alkali resistance, thermal stability, rapid adsorption rate and can be separated from water by magnetic separation rapidly.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xiaofen Wang,Jiang Ma,Xirui Lu,Zhiwei Fang,Lingshuang Li,Linyan Li,Yushan Yang
Hollandite ceramics are considered as a promising host matrix for cesium immobilization. In the paper, [Cs x Ba y ][Fe 3+ 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.3 ≤ x , y ≤ 0.75) ceramics were synthesized by solid-state reaction method using 133 Cs and 133 Ba as the substitutes for radioactive Cs and its daughter product Ba. It was found that the as-prepared (Cs,Ba)-hollandite solid solution shows a tetragonal structure ( I 4/m) with >90% crystallinity and good Cs retention at 1250 °C. Moreover, the normalized release rates of Cs and Ba are in the order of 10 −3 g m −2 d −1 for 28 days, exhibiting excellent aqueous durability.
研究领域:
材料科学
·
核废物管理
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Peigang He,Jingyi Cui,Meiling Wang,Shuai Fu,Hualong Yang,Chengyue Sun,Xiaoming Duan,Zhihua Yang,Dechang Jia,Yu Zhou
Notwithstanding the success of carbon-free nuclear power in the new energy industry, an effective way to address nuclear contamination is still lacking. As a generally accepted method to date, immobilization of radioactive nuclear wastes with inexpensive and environment-friendly matrix such as geopolymer has attracted extensive attention. In this contribution, Na-based and K-based metakaolin geopolymer were prepared to encapsulate simulated radioactive Cs + and Sr 2+ under different temperatures and environments during long-term leaching tests. The temperature-dependent and environmental-dependent leaching kinetics as well as their dominant leaching mechanisms have been revealed. The results showed that Na-based and K-based geopolymer exhibited better immobilization performance than that of Portland cement, ceteris paribus. For the immobilization of Cs + , Na-based geopolymer showed lower leaching rate than K-based geopolymer under the same leaching conditions. Both higher temperature and salt solution accelerated the leaching behaviors of Sr + and Cs 2+ from the encapsulation matrix. This contribution sheds light on understanding the dominant leaching mechanisms of hazardous elements under different storage environments and highlights the significance of salt-tolerant matrix for the immobilization of nuclear wastes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）