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Selective Separation of Radioactive Thorium and Uranium from Scandium Using N-Heterocyclic Carboxamide Ligands

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SSRN 2023年

作者： Jin, Chenyang Yang, Xiaofan Fang, Dong Wang, Shihui Ni, Shuainan Ding, Anting Cen, Peng Xiao, Chengliang College of Chemical and Biological Engineering Zhejiang University Hangzhou310058 China Institute of Zhejiang University-Quzhou Zhejiang University Quzhou324000 China Institute of Nuclear Science and Technology Zhejiang University Hangzhou310058 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures China

Scandium is a valuable strategic resource widely dispersed in nature and frequently coexists with other minerals, some of which contain radionuclides, particularly uranium and thorium. It is of great importance to remove these radioactive elements in a green and efficient manner to manufacture superior scandium products. The present study synthesized a range of N-heterocyclic carboxamide ligands and undertook a full investigation of their efficacy in extracting and separating uranium and thorium from scandium. Of these, two demonstrated preferential extraction of radioactive elements in HNO3, while the extraction of scandium was observed in HClO4. Under optimum conditions, 95.3% of uranium and 70.7% of thorium were extracted with only a 3.6% loss of scandium after a single-stage extraction, and the other rare earth elements were scarcely extracted. In addition, almost all the uranium and thorium in a simulated solution were depleted following a five-stage extraction process when treated with the phenanthroline-derived carboxamide ligand, resulting in a scandium oxide product with a 99.99% purity. The coordination mechanism of the extraction was identified using slope analysis, NMR titration, and UV-vis titration. All the evidence indicates that U(VI) and Th(IV) complexes with the phenanthroline-derived carboxamide ligand have a stoichiometry ratio of 1:1, whereas, in the case of scandium, there are both 1:1 and 1:2 species. This work enables the preparation of high-purity scandium with an ultra-low level of radioactivity and provides a new idea for the efficient processing of rare earth minerals. © 2023, The Authors. All rights reserved.

关键词： Ligands

Rare Earth-Based Antibacterial and Antialgal Complexes, Synthesis, Characterization and Application

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SSRN 2023年

作者： Li, Jinlei Zhu, Qiuyin Lin, Fenglong Wu, Yincai Liu, Linze Chen, Libin Huang, Jun Chen, Xirong Wang, Shenglong Song, Lijun Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou341000 China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Xiamen361021 China Technology Inc Xiamen361028 China Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China

关键词： Rare earths

An interfacial engineering strategy of electrocatalyst boosts ammonia electrosynthesis

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Science China Chemistry 2019年第8期62卷 921-922页

作者： Yichun Ding Genxiang Wang Zhenhai Wen CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences

Ammonia (NH3) is not only an essential chemical feedstock for the manufacture of nitrogen-rich fertilizers but also a promising carbofree energy carrier for storing H2 due to its high content of hydrogen (17.6% by mass). At present, industrial NH3 is still dominantly produced by the traditional Haber-Bosch process, which reduces nitrogen (N2) to NH3 (N2+3H2←→2NH 3) at high temperatures (350-550 °C) and high pressures (150-350 atm)[1]. Such a process not only requires the raw materials of high-purity streams of nitrogen and hydrogen but also consumes tremendous energy;noting that the consumed hydrogen occupied approximately 50% of its global production that produced exclusively from transformations of fossil resources with the emission of greenhouse gas [1].

关键词： engineering strategy electrosynthesis tremendous energy

Recovery of thorium and rare earths from leachate of ion-absorbed rare earth radioactive residues with N1923 and Cyanex■572

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Journal of Rare Earths 2021年第10期39卷 1273-1281,I0004页

作者： Jia Su Xiangguang Guo Yun Gao Shan Wu Ruigao Xu Xiaoqi Sun CAS Key Laboratory of Design and Assembly of Functional Nanostructures And Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Institute of Rare Earth Materials Haixi InstituteChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100039China Longnan County Nanyu Rare Earth Resources Comprehensive Utilization Co. Ltd.Ganzhou 341000China Ganzhou Rare Earth Group Co. Ltd.Ganzhou 341000China

Ion-absorbed rare earth ores radioactive residues(IREORR)are a class of waste residue from the production of rare earth elements(REEs).Because of its radioactive dose,IREORR are usually stored in waste *** are difficult to be disposed ***,it contains relatively high concentrations of REEs,which can be considered as a valuable secondary *** this paper,a novel process is developed for the separation of thorium(Th)and recovery of REEs from IREORR hydrochloric acid leachate with primary amine N1923 and Cyanex?572,*** effects of sulfate concentration,extractant concentration and pH on N1923 extraction in hydrochloric acid solution were investigated in *** results show that the extraction capacity of N1923 can be improved by adding sulfate to the solution and increasing the concentration of *** has little effect on the extraction of Th when pH is higher than *** for the stripping,REEs are more easily stripped from loaded organic phase than Th,and nitric acid is a better stripping agent than hydrochloric *** with the extraction of Cyanex■572 for REEs,a fractional extraction experiment for separating Th and enriching of REEs was *** yield of Th is higher than 99.9%and the concentration of REEs is enriched to 183.84 g/L.

关键词： Radioactive residues Rare earth Thorium Primary amine N1923 Cyanex?572

Bimodal Intelligent Electronic Skin Based on Proximity and Tactile Interaction for Pressure and Configuration Perception

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SSRN 2023年

作者： Wu, Qirui Zhou, Chunhui Xu, Yidan Han, Songjiu Chen, Anbang Zhang, Jiayu Chen, Yujia Yang, Xiaoxiang Huang, Jianren Guan, Lunhui CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou350108 China School of Mechanical Engineering and Automation Fuzhou University Fuzhou350108 China Department of Oncology The First Affiliated Hospital of Anhui Medical University Hefei230000 China

The flexible bimodal e-skin exhibits significant promise for integration into the next iteration of human-computer interaction, owing to the integration of tactile and proximity perception. However, those challenges such as low tactile sensitivity, complex fabrication processes, and incompatibility with bimodal interactions have restricted the widespread adoption of bimodal e-skin. Herein, a bimodal capacitive e-skin capable of simultaneous tactile and proximity sensing has been developed. The entire process eliminates intricate fabrication techniques, employing DLP-3D printing for the electrode layers and sacrificial templating for the dielectric layers, conferring high tactile sensitivity (1.672 kPa-1) and rapid response capability (~30 ms) to the bimodal e-skin. Moreover, exploiting the "fringing electric field" effect inherent in parallel-plate capacitors has facilitated touchless sensing, thereby enabling the static distance recognition and dynamic gesture recognition of varying materials. Interestingly, the e-skin sensing array was created to identify the positions and pressure levels of various objects of different masses. Furthermore, with the aid of machine learning techniques, an artificial neural network has been established to possess intelligent object recognition capabilities, facilitating the identification, classification, and training of various object configurations. The advantages of the bimodal e-skin render it highly promising for extensive applications in the field of next-generation human-machine interaction. © 2023, The Authors. All rights reserved.

关键词： Neural networks

Photothermal lanthanide nanomaterials: From fundamentals to theranostic applications

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BMEMat(BioMedical Engineering Materials) 2024年第4期2卷 1-17页

作者： Zhuo Li Jiacheng Gong Shan Lu Xingjun Li Xiaobo Gu Jin Xu Jawairia Umar Khan Dayong Jin Xueyuan Chen State Key Laboratory of Structural Chemistry Fujian Key Laboratory of Nanomaterialsand CAS Key Laboratory of Design and Assembly of Functional NanostructuresFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China FuzhouChina University of Chinese Academy of Sciences BeijingChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhouChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Institute for Biomedical Materials&Devices(IBMD) Faculty of ScienceUniversity of Technology SydneySydneyAustralia

Photothermal lanthanide nanomaterials with unique photophysical properties have been innovatively explored for diagnostics and non‐invasive therapies,and hold great promise for precision *** this review,we start from the basic principles of excited‐state dynamics and provide a thorough comprehension of the main pathways for photothermal conversion in lanthanide *** influencing the photothermal effect such as lanthanide‐doping concentration,particle size,and crystal structure have been fully *** strategies for the design of efficient lanthanide‐based photothermal agents,including dye sensitization to break the absorption limit and semiconductor combination to add cross‐relaxation pathways,have also been ***,we highlight the cutting‐edge applica-tions of photothermal lanthanide nanoplatforms with optical diagnosis and temperature feedback in photothermia‐associated ***,the current challenges and future efforts for clinical applications are *** review is expected to offer a better understanding of photothermal mechanisms and inspire efforts for designing versatile lanthanide theranostic nanoplatforms.

关键词： lanthanide nanomaterials optical imaging photothermal mechanism photothermal therapy temperature feedback theranostics

Stretchable and Self-Healing Ionic Conductive Elastomer for Multifunctional 3d Printable Sensor

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SSRN 2022年

作者： Wu, Qirui Han, Songjiu Zhu, Jundong Chen, Anbang Zhang, Jiayu Yan, Zhen Liu, Jiantao Huang, Jianren Yang, Xiaoxiang Guan, Lunhui CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou350108 China School of Mechanical Engineering and Automation Fuzhou University Fuzhou350108 China

Soft ionic conductors (ICs) such as hydrogels and ionogels have attracted extensive attention as they are promising candidates as the key components used in flexible electronic devices. Nonetheless, hydrogels and ionogel-based materials reported by previous studies usually exhibit prominent problems, such as solvent leakage and evaporation, limiting their application in complex environment. In this work, solid-state conductive ionogels (SCIg) composed of long-chain copolymer networks without any volatile liquids were designed and prepared. The dynamic non-covalent bonds ensure its long-term stable signal monitoring as a sensor. The SCIg shows extraordinary comprehensive properties, including admirable tensile strength (0.97 MPa) under large deformations (λ=26.6 tensile stretch), promising conductivity (56.1 mS m -1 ) and surprising self-healing efficiency (>92%). Notably, the SCIgs solved a well-established problem in ionogels, namely the conflict of ionic conductivity versus mechanical properties. Moreover, a series of ionoelastomers based on the SCIg were further exploited as a resistance-type sensor, capacitive-type sensor and multifunctional electronic skins capable of detecting a variety of mechanical signals. The sensors deliver splendid long-term stability with signal responses. Meanwhile, the obtained SCIgs exhibit high efficiency ultraviolet (UV) curable 3D printability, enabling the bulk production of microcircuits with 130 μm diameter in a transitory time. This work shows that the developed SCIg presents great application potential in the fields of electronic skin, physiological signal detection and human-machine interface. © 2022, The Authors. All rights reserved.

关键词： 3D printers

Electromagnetic Interference between Multiple Quantum Mechanical Domains in Electronic Devices 4

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Electromagnetic Interference between Multiple Quantum Mechan...

4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Meng, Lingyi Yam, Chiyung Chen, Quan CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Beijing Computational Science Research Center Beijing100193 China School of Microelectronics Southern University of Science and Technology Shenzhen518055 China

ISBN: (纸本)9781733509619

We study the electromagnetic interference between active components in complicated electronic structures. In our simulations, dynamic behaviors of these active components with detailed atom configurations are described by the first-principles methods, while the entire system is modeled by a novel coupled quantum mechanics and electromagnetics (QM/EM) in the real time domain. We demonstrate that electronic devices could be treated independently in the sense of classical electromagnetics below a particular operational frequency (e.g. 10 THz). Our time-domain QM/EM simulations could also quantitatively describe the dependency of electromagnetic interference on the separating distance between devices. The relationships between induction current and separating distance are compared at different operational frequencies. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Signal interference

Spontaneously producing syngas from MFC-MEC coupling system based on biocompatible bifunctional metal-free electrocatalyst

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Science China Materials 2021年第3期64卷 592-600页

作者： Wei Wang Rahul Anil Borse Jiafang Xie Yaobing Wang Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsState Key Laboratory of Structural ChemistryKey Laboratory of Optoelectronic Materials Chemistry and PhysicsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China University of Chinese Academy of Sciences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction(CDRR)is of great significance to the virtuous cycle of carbon ***,due to the high overpotential involved in this reaction,high power consumption and high-cost noble-metal-based catalysts are required for driving this ***,the electrochemical CDRR was achieved on biocompatible metal-free nitrogen,phosphorus co-doped carbon-based materials(NP-C)in the microbial fuel cell-microbial electrolysis cell(MFC-MEC)coupling *** the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC,syngas was spontaneously produced from this coupling system without external energy *** the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction(ORR),the current density of the MEC reached−0.52 mA cm^−2,and the Faradaic efficiencies(FEs)of CO and H2 were 60%and 40%,respectively,at a load resistance of 10Ω.Moreover,the CO/H2 product ratio can be changed by adjusting the load resistance,which will widely meet various demand of syngas usage in further *** study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.

关键词： spontaneous production syngas MFC-MEC coupling system N/P-co-doped carbon electrocatalyst