摘要：
After an emergency shutdown of a lead-bismuth fast reactor, thermal stratification occurs in the upper Plenum, which negatively impacts the integrity of the reactor structure and the residual heat removal capacity of natural circulation flow. The research on thermal stratification of reactors has mainly been conducted using an experimental method, a system program, and computational fluid dynamics (CFD). However, the equipment required for the experimental method is expensive, accuracy of the system program is unpredictable, and resources and time required for the CFD approach are extensive. To overcome the defects of thermal stratification analysis, a high-precision full-order thermal stratification model based on CFD technology is prepared in this study. Furthermore, a reduced-order model has been developed by combining proper orthogonal decomposition (POD) with Galerkin projection. A comparative analysis of thermal stratification with the proposed full-order model reveals that the reduced-order thermal stratification model can well simulate the temperature distribution in the upper plenum and rapidly elucidate the thermal stratification interface characteristics during the lead-bismuth fast reactor accident. Overall, this study provides an analytical tool for determining the thermal stratification mechanism and reducing thermal stratification.
摘要：
First‐principles calculations show that black phosphorene (BP) exhibits strong adsorption with uranium and thorium atoms even when the temperature reaches 500 and 673 K. The strong adsorption is stabilized by the p‐d coupling between the phosphorus and actinide atoms. BP is an ideal adsorption and separation material for actinides with promising potential applications such as uranium extraction from seawater. Abstract Density functional theory (DFT) calculations were carried out in this work to systematically investigate the adsorption properties of monolayer black phosphorene (BP) for actinide uranium (U), thorium (Th), and plutonium (Pu) atoms. More specifically, the linear response method was used and the Hubbard U values of 2.97 and 2.61 eV were fitted describing the strong lattice point Coulomb interactions of the U and Pu 5f orbitals, respectively. From the DFT + U calculations, it was demonstrated that the U, Th, and Pu atoms can be favorably adsorbed on the hollow sites of the BP surface, with an adsorption energy of 3.48, 4.93, and 0.98 eV, respectively. By analyzing the electronic structure, charge transfer, and highest occupied molecular orbital, it was revealed that the U and Th adatoms can induce the generation of impurity states within the band gap of BP and stabilize their adsorption by strong p‐d coupling with the phosphorus atoms. In addition, from the electron–phonon coupling calculations, it was revealed that the temperature for the stable adsorption of the U and Th adatoms can reach as high as 500 and 673 K. By using the adsorption rate equation, the critical temperature for the adsorption–desorption transition of U and Pu adatoms was estimated to be 632 and 185 K, respectively, while the Th adatom did not tend to desorb. Our results clearly indicate that BP is an ideal adsorption and separation material for actinides with promising potential applications, such as uranium extraction from seawater.
期刊：
International Journal of Applied Ceramic Technology,2023年20(3):1740-1752 ISSN：1546-542X
通讯作者：
Chen, P.;Li, Y.
作者机构：
[He, Ling; Xiao, Peng; Pan, Ling; Li, Yang] Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China.;[Chen, Pengju] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Zhou, Wei] Hunan Univ Technol, Coll Met & Mat Engn, Zhuzhou, Peoples R China.;[Chen, Pengju; Li, Yang] Cent South Univ, Powder Met Res Inst, 932 Yuelu Ave,Lushan South Rd, Changsha 410083, Peoples R China.
通讯机构：
[Li, Y.] S;[Chen, P.] P;Powder Metallurgy Research Institute, No.932 Yuelu Avenue, Lushan South road, China;State Key Laboratory of Powder Metallurgy, China
摘要：
The mullite and ytterbium disilicate (beta-Yb2Si2O7) powders as starting materials for the Yb2Si2O7/mullite/SiC tri-layer coating are synthesized by a sol-gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb2Si2O7/mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800-1000 and 1300 & DEG;C, respectively. Yb2SiO5, alpha-Yb2Si2O7, and beta-Yb2Si2O7 were gradually formed between 800 and 1000?, and Yb2SiO5 and alpha-Yb2Si2O7 were completely transformed into beta-Yb2Si2O7 at a temperature above 1200 & DEG;C. The weight loss of Yb2Si2O7/(SiCw-mullite)/SiC tri-layer coating coated specimens was 0.15 x 10(-3) g cm(-2) after 200 h oxidation at 1400?, which is lower than that of Yb2Si2O7/mullite/SiC tri-layer coating (2.84 x 10(-3) g cm(-2)). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and beta-Yb2Si2O7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO2 (oxidation of SiC whiskers) and mullite particles.
期刊：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2023年145(22):12206-12213 ISSN：0002-7863
通讯作者：
Zhang, FX
作者机构：
[Li, Jiangnan; Fan, Wenjun; Zhang, Fuxiang; Mehmood, Rashid; Zhang, Yashi] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis iChEM, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China.;[Li, Jiangnan; Mehmood, Rashid; Zhang, Yashi] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.;[Zhou, Zhen; Hu, Xu] Nankai Univ, Inst New Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Sch Mat Sci & Engn,Minist Educ, Tianjin 300350, Peoples R China.;[Liu, Peijia; Wang, Junhu] Chinese Acad Sci, Dalian Inst Chem Phys, Ctr Adv Mossbauer Spect, Moossbauer Effect Data Ctr, Dalian 116023, Liaoning, Peoples R China.;[Liu, Min] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, FX ] C;Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis iChEM, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China.
摘要：
Iron (Fe)-based bimetallic oxides/hydroxides have been widely investigated for promising alkaline electrochemical oxygen evolution reactions (OERs), but it still remains argumentative whether Fe(3+) or Fe(4+) intermediates are highly active for efficient OER. Here, we rationally designed and prepared one Fe, V-based bimetallic composite nanosheet by employing the OER-inert V element as a promoter to completely avoid the argument of real active metals and using our recently developed one-dimensional conductive nickel phosphide (NP) as a support. The as-obtained hierarchical nanocomposite (denoted as FeVO(x)/NP) was evaluated as a model catalyst to gain insight into the iron-based species as highly active OER sites by performing in situ X-ray absorption spectroscopy and (57)Fe Mössbauer spectroscopy measurements. It was found that the high-valent Fe(4+) species can only be detected during the OER process of the FeVO(x)/NP nanocomposite instead of the iron counterpart itself. Together with the fact that the OER activities of both the vanadium and iron counterparts are by far worse than that of the FeVO(x)/NP composite, we can confirm that the high-valent Fe(4+) formed are the highly active species for efficient OER. As demonstrated by density functional theory simulations, the composite of Fe and V metals is proposed to cause a decreased Gibbs free energy as well as theoretical overpotential of water oxidation with respect to its counterparts, as is responsible for its excellent OER performance with extremely low OER overpotential (290 mV at 500 mA cm(-2)) and extraordinary stability (1000 h at 100 mA cm(-2)).
摘要：
The synergistic effect between transition metal active centers and the generation of multiple removal pathways has a significant impact on the catalytic activation efficiency of peroxymonosulfate. In this work, a kind of composite catalyst was prepared by growing VCo-metal-organic frameworks (VCo-MOF) in-situ on the surface of Ti3C2Tx by a solvothermal method. The morphology and structure are char-acterized by Transmission Electron Microscope (TEM), Energy Dispersion Spectrum (EDS), Atomic Force Microscope (AFM), etc. Response surface methodology was used to optimize the experimental conditions. Only 5 mg catalyst can be used to effectively activate PMS and remove 96.14 % ciprofloxacin (CIP, 20 mg/ L) within 30 min. The removal effect of catalyst on CIP in different actual water environment was explored. In addition, the fluorescence spectrum test also verified the effective removal of ciprofloxacin. V-Co-Ti ternary system provides a wealth of active sites for CIP removal. Cyclic voltammetry (CV) and lear sweep voltammetry (LSV) tests showed the existence of the electron transfer pathway. The results of density functional theory (DFT) calculation show that VCo-MOF@ Ti3C2Tx has excellent adsorption and activation ability for PMS. At the same time, the hydrophilicity of the catalyst makes PMS more inclined to react with water molecules, which promotes the formation of a unique superoxide radical path. (C) 2022 Elsevier Inc. All rights reserved.
摘要：
The intrinsic brittleness and low bonding strength of SiC-ZrC coatings to the graphite severely limit the ablation performance. Herein, SiC nanowires (SiCnw) were introduced between pre-oxidized graphite and coatings. The brittleness of coatings was reduced and the bonding strength was increased from 5.49 & PLUSMN; 0.88 MPa to 8.33 & PLUSMN; 0.65 MPa by SiCnw. Both simulation and experimental results show SiCnw also worked as thermal conduction channels to improve the ablation resistance. After plasma ablation for 120 s, the ablation rates of SiCnw/SiC-ZrC coated graphite were 0.315 mg/s and 0.217 & mu;m/s, respectively, which are much lower than those of pure graphite and SiC-ZrC coated graphite.
作者机构：
[Lei, Zeyong; Deng, Jian; Lei, ZY; Zhong, Lin] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Guolong; Deng, Jian] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Lei, Jieheng] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Mu] China Nucl Ind 24 Construct Co Ltd, Beijing 102400, Peoples R China.
通讯机构：
[Lei, ZY ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
304SS;cobalt;deposition;spinel;primary loop
摘要：
The radioactive corrosion products (58)Co and (60)Co in the primary loops of pressurized water reactors (PWRs) are the main sources of radiation doses to which workers in nuclear power plants are exposed. To understand cobalt deposition on 304 stainless steel (304SS), which is the main structural material used in the primary loop, the microstructural characteristics and chemical composition of a 304SS surface layer immersed for 240 h in borated and lithiated high-temperature water containing cobalt were investigated with scanning electron microscopy (SEM), X-ray diffraction (XRD), laser Raman spectroscopy (LRS), X-ray photoelectron spectroscopy (XPS), glow discharge optical emission spectrometry (GD-OES), and inductively coupled plasma emission mass spectrometry (ICP-MS). The results showed that two distinct cobalt deposition layers (an outer layer of CoFe(2)O(4) and an inner layer of CoCr(2)O(4)) were formed on the 304SS after 240 h of immersion. Further research showed that CoFe(2)O(4) was formed on the metal surface by coprecipitation of the iron preferentially dissolved from the 304SS surface with cobalt ions from the solution. The CoCr(2)O(4) was formed by ion exchange between the cobalt ions entering the metal inner oxide layer and (Fe, Ni) Cr(2)O(4). These results are useful in understanding cobalt deposition on 304SS and have a certain reference value for exploring the deposition behavior and mechanism of radionuclide cobalt on 304SS in the PWR primary loop water environment.
期刊：
Journal of Instrumentation,2023年18(5):P05029 ISSN：1748-0221
通讯作者：
Qin, Z;Luo, F
作者机构：
[Qin, Z.; Yang, A.; Wang, Z.] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Qin, Z.; Yang, A.; Wang, Z.] State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.;[Luo, F.; Luo, F] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Yi, R.] Xian Univ Finance & Econ, Sch Management, Xian 710100, Peoples R China.
通讯机构：
[Luo, F ] U;[Qin, Z ] C;Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
large signals;SPE;20-inch MCP-PMT;LSP;LSP parameter
摘要：
In this paper, we investigated a large signal phenomenon (LSP) in single photo- electron (SPE) measurement of the 20-inch MCP-PMT. The LSP will cause a long tail of the PMT output charge spectrum, and it will affect the calculation of the number of photoelectrons (PEs) collected and the gain of the PMT. To evaluate the LSP of the 20-inch MCP-PMT, a parameterization method is developed, by measurement of the LSP distribution in the full photocathode of the PMT and study of LSP variation with different voltage ratios applied for the PMT.
通讯机构：
[Shunyan Ning; Yuezhou Wei] S;School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
摘要：
Recycling Sn from waste liquid crystal display (LCD) is crucial to alleviate resource shortage and prevent environmental pollution. However, the disposal of waste LCD is a complex coupling process affected by multi -factors. The lack of mature harmless and resource-based treatment process restricts the development of indus-trialization. Therefore, an environmentally sound process focusing on resource recovery was proposed to recover Sn efficiently and remove toxic substances from waste LCD in this study. The reaction mechanism and leaching kinetics were discussed assisted by mechanical activation, and the statistical and mathematical method (Box-Behnken Design (BBD) model) was adopted to optimize the leaching process. The results showed that the me-chanical activation could improve the physical and chemical properties of ITO glass. The essence of the leaching reaction mechanism was that the H+ in H2SO4 combined with O-2-in the lattice of In2O3 to form OH-, resulting in Sn-O bond broking and Sn4+ entering the aqueous solution. Furthermore, the Zeta potential results showed that the Zeta potential of SiO2 particles less than 0.035 mm was close to zero near pH 2, resulting in agglom-eration between SiO2 particles under the action of Coulomb force. The leaching kinetics was well expressed by the shrinking core model. The BBD model showed satisfactory correlation between the predicted and actual results, and the particle size was the most critical factor affecting the leaching efficiency. The maximum leaching efficiency was 87.6% which was obtained under the following optimal condition: 6 mol/L H2SO4, 108 min, 88 degrees C, and 0.035 mm ITO glass powder. Our findings demonstrated that the developed recovery process was both efficient and environmentally sound, which had the potential in the industrialization of waste LCD recycling system.
期刊：
Chemical Engineering Journal,2023年478:147425 ISSN：1385-8947
通讯作者：
Zhu, JL;Ning, SY
作者机构：
[Zhu, Yongzheng; Zhu, Jinliang; Wu, Wangzhi; Ma, Xiangying; Zhu, JL; Wang, Nannan; Zhu, Yanqiu; Huang, Guo; Hu, Fengtao; Shen, Pei Kang] Guangxi Univ, Coll Chem & Chem Engn, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;[Ning, Shunyan; Hu, Fengtao] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Ning, SY ] U;[Zhu, JL ] G;Guangxi Univ, Coll Chem & Chem Engn, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
摘要：
Hydrogen evolution and oxidation are critical to realizing hydrogen energy recycling and to the hydrogen economy. Therefore, it is important to develop non-precious metal catalysts with high efficiency and stability for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR). In this study, we reported on the facile synthesis of Co2P-Fe2P heterogeneous nanoparticles on a porous carbon skeleton (Co2P-Fe2P/C), which exhibited high activity for both HOR and HER in alkaline conditions. The overpotential of Co2P-Fe2P/C toward HER was 77 mV at 10 mA cm-2, with a Tafel slope of 42 mV dec- 1 and excellent stability under long-term testing after 120 h. The current density at 0.1 V for HOR was 1.68 mA cm-2, which was close to that of commercial Pt/C. In situ Raman spectroscopy indicated that surface reconstruction was involved for Co2P-Fe2P/C, CoFe2O4, and FeOOH, as detected during HOR. Density functional theory calculations revealed strong electron interaction between Fe2P and Co2P at the heterogeneous interfaces, resulting in an optimal hydrogen adsorption strength for HER. This study significantly contributes to the realization of low-cost and high-efficiency bifunctional catalysts for HER and HOR.
通讯机构：
[Wang, Hongqing; Liao, Yun] H;[Wang, Meng] S;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:;School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China. Electronic address:;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:
摘要：
As an energy-efficient and eco-friendly technique, capacitive deionization (CDI) has shown great potential for uranium (U(VI)) capture recently. However, extracting U(VI) with high kinetics, capacity and selectivity remains a major challenge due to the current surface active sites-based material and co-existing ions in aqueous solution. Here we rationally designed a layered 2D/2D niobium phosphate/holey graphene (HGNbP) electrode material, and originally demonstrated its efficient U(VI) capture ability via an electro-adsorption and electrocatalytic reduction coupling process. The less-accumulative loose layered architecture, open polycrystalline construction of niobium phosphate with active phosphate sites, and rich in-plane nano-pores on conductive graphene nanosheets endowed HGNbP with fast charge/ion transport, high electroconductivity and superior pseudocapacitance, which enabled U(VI) ions first to be electro-adsorbed, then physico-chemical adsorbed, and finally electrocatalysis reduced/deposited onto electrode surface without the limitation of active sites under a low potential of 1.2V. Based on these virtues, the HGNbP exhibited a fast adsorption kinetics, with a high removal rate of 99.9% within 30min in 50mgL(-1) U(VI) solution, and a high adsorption capacity up to 1340mgg(-1) in 1000mgL(-1) U(VI) solution. Furthermore, the good recyclability and selectivity towards U(VI) were also realized.
作者机构：
[Li, Yongmei; Li, Chunguang] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Yongmei; Liu, Longcheng; Meng, Shuo; Li, Chunguang] Univ South China, R&D & Modeling Ctr Treatment & Disposal Radioact, Hengyang 421001, Peoples R China.;[Liu, Longcheng] Royal Inst Technol KTH, Chem Engn, S-10044 Stockholm, Sweden.;[Liu, Longcheng] Beijing Res Inst Chem Engn & Met, Beijing 101149, Peoples R China.
通讯机构：
[Chunguang Li] S;[Longcheng Liu] R;R & D and Modeling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang 421001, China<&wdkj&>Chemical Engineering, Royal Institute of Technology KTH, Stockholm 10044, Sweden<&wdkj&>Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, China<&wdkj&>School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China<&wdkj&>R & D and Modeling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang 421001, China
摘要：
The colloidal stability, one of the basic and important properties of a colloidal dispersion, is commonly evaluated in terms of the stability ratio. In this study, a recently developed expression for the stability ratio is updated, by reformulating the fraction of successful collisions leading to secondary minimum coagulation. The updated formula reinterprets the statistical meaning of the fraction of successful collisions leading to primary or secondary minimum coagulation, ensuring that the total fraction of successful collisions is always less than or equals to 1. It was shown to be superior to the available expressions in accounting for the contribution of the primary and secondary minimum coagulations on the stability ratio. It can well interpret the stability of colloidal dispersions of spherical particles; moreover, it is of great potential to be applied to colloidal dispersions of plate-like particles. In addition, this formula is found to be consistent with the concept of the critical coagulation concentration and well interpret the effects of particle size, counterion valence, surface potential, and Hamaker constant on the colloidal stability.
摘要：
A series of heterostructured materials with variable ratio of 316 powders in 18Ni300 powders were prepared by laser melting deposition (LMD). The microstructural evolution and its influence on tensile features were explored before/after aging treatment or solution-aging treatment. The results indicated that the fraction of g phase was increased gradually with increasing 316SS, and dislocation caused by the deformation could be migrated and annihilated within the region of g phase, second phase strengthening could contribute to excellent elongation for 18Ni300 maraging steel. The elongation of the AF4 sample was 235.2% higher than that of the AF0 sample when a 37.5% reduction in the ultimate tensile strength occurred. In addition, thermal stress could exist in the as-cladded sample, an appropriate heat treatment could release the thermal stress and precipitate nanoscale intermetallic compound. Their synergistic effect could contribute to overcoming the strength-elongation trade-off. A relatively ideal sample, a discontinuous g phase surrounded by a phase, which displayed high strength of 1678.4 MPa with high elongation of 10.9% after solution-aging treatment. Compared with laser cladded 18Ni300 maraging steel, a 41.7% increment in the elongation was obtained at the cost of 11.3% reduction in ultimate tensile strength. & COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC
摘要：
The effective capture of radioactive iodine vapor is crucial for radiation safety during spent fuel reprocessing. However, current materials used for iodine vapor capture have limitations such as low adsorption efficiency and poor stability, which hinder the effectiveness. To address this issue, an efficient, stable, recoverable and heterogeneous MOF-on-MOF [NH2-MIL-101-on-NH2-UiO-66] adsorbent was prepared using the epitaxial growth strategy. The adsorbent was extensively characterized with various technologies including FT-IR, XPS and XRD, and batch experiments were conducted to evaluate the performance in iodine gas adsorption. Results showed that the adsorption capacity of NH2-MIL-101-on-NH2-UiO-66 reached 1930 mg/g at 80 degrees C and ambient pressure, outperforming the parent MOFs, with a 20-33% higher adsorption rate and a 1.52-2.74 times higher adsorption capacity. Notably, the adsorbent exhibited superior performance compared to commercial silver-exchanged zeolite and other MOFs adsorbents. The excellent adsorption performance of this adsorbent can be attributed to its abundant adsorption sites and well-defined pore structure. Additionally, the adsorbent displayed good thermal stability, withstanding temperatures up to 360celcius. Overall, this study provides a highly effective material for iodine vapor adsorption and contributes to the understanding of novel MOF-on-MOF architectures and the applications.
摘要：
Photoneutron cross-section (PNCS) data are important in various current and emerging applications. Although a few sophisticated methods have been developed, there is still an urgent need to study the PNCS data. In this study, we propose the extraction of PNCS distributions using a combination of gamma activation and reaction yield ratio methods. To verify the validity of the proposed extraction method, experiments for generating
$$^{62, 64}\hbox {Cu}$$
and 85m,87mSr isotopes via laser-induced photoneutron reactions were performed, and the reaction yields of these isotopes were obtained. Using the proposed extraction method, the PNCS distributions of
$$^{63}\hbox {Cu}$$
and
$$^{86}\hbox {Sr}$$
isotopes (leading to
$$^{\text {85m}}\hbox {Sr}$$
isotope production) were successfully extracted. These extracted PNCS distributions were benchmarked against available PNCS data or TALYS calculations, demonstrating the validity of the proposed extraction method. Potential applications for predicting the PNCS distributions of the 30 isotopes are further introduced. We conclude that the proposed extraction method is an effective complement to the available sophisticated methods for measuring and evaluating PNCS data.
期刊：
Separation and Purification Technology,2023年305:122499 ISSN：1383-5866
通讯作者：
Shunyan Ning
作者机构：
[Fujita, Toyohisa; Chen, Yedan; Li, Zenguan; Zhong, Yilai] Guangxi Univ, Sch Resources Environm & Mat, Guangxi Key Lab Proc Nonferrous Met & Featured Mat, MOE,Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;[Wang, Ji; Ning, Shunyan; Wei, Yuezhou; Yin, Xiangbiao; Chen, Lifeng] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ Shanghai, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China.
通讯机构：
[Shunyan Ning] S;School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang 421001, PR China
关键词：
TODGA;Sc;Zr;Adsorption;Separation
摘要：
As the similar properties of Sc and Zr, their mutual separation is difficult and Zr is one of the main impurity elements in high purity Sc2O3 which should be strictly controlled. A novel porous functionalized extraction resin TODGA/SiO2-P was synthesized for selective separation of Zr(IV) from Sc(III). The morphology and structure of the resin were profiled by SEM-EDS, BET and TG-DSC. The results of batch experiments showed that the resin had a better affinity for Zr(IV) than Sc(III) with SFZr/Sc of 25 in 6 M HNO3. Excellent separation of Sc(III) and Zr(IV) can be achieved by chromatography column experiment that more than 99% of Zr(IV) could be removed from the Sc2O3 leaching solution. The results show TODGA/SiO2-P has significant potential for separation of Zr from Sc to produce high purity scandium. In addition, the metal cation binding to the ether-oxygen and amide bonds on the ligand was revealed by FT-IR, XPS, NMR and DFT calculation. The binding of each metal cation to three TODGA ligands was determined by liquid–liquid extraction experiments. The trefoi-shaped ion clusters formed with metal ions and nitrate during extraction using diglycolamide ligands were proved by DFT simulation, which provided a new insight for the ligand chemistry of Sc and Zr.
作者机构：
[Li, Xian-Kai; He, Peng-Qin; An, Zhen-Dong; Tang, Ren-Guang; Zhou, Tao; Yang, Gao-Le; Wang, Jing; An, ZD] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China.;[Li, Xin-Xiang; Hu, Xin-Rong; An, Zhen-Dong; An, ZD] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[An, Zhen-Dong; Qiu, Wei-Wei; Liao, Zheng-Fa; An, ZD; Zhuang, Zi-Yue; Zhang, Xiao-Ping] Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China.;[An, Zhen-Dong; Qiu, Wei-Wei; Liao, Zheng-Fa; An, ZD; Zhuang, Zi-Yue; Zhang, Xiao-Ping] CNSA Macau Ctr Space Explorat & Sci, Macau 999078, Peoples R China.;[Gao, Ke-Qing; Jiang, Wei; Fan, Rui-Rui; Sun, Kang; Tan, Zhi-Xin; Chen, Yong-Hao; Yi, Han; Tang, Jing-Yu; Gu, Min-Hao; Li, Qiang; Zhang, Yue; Jing, Han-Tao] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
通讯机构：
[An, ZD ] S;Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China.;Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China.;CNSA Macau Ctr Space Explorat & Sci, Macau 999078, Peoples R China.
关键词：
Time-of-flight technique;Neutron capture cross sections;Maxwell average cross sections
摘要：
The neutron capture cross sections (
$${n,\gamma }$$
) of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source. Prompt
$$\gamma$$
-rays originating from neutron-induced capture events were detected using four C
$${}_6$$
D
$${}_6$$
detectors. The pulse-height weighting technique and double-bunch unfolding method based on Bayesian theory were used in the data analysis. Background deductions, normalization, and corrections were carefully considered to obtain reliable measurement results. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region (RRR). The average cross sections in the unresolved resonance region (URR) were obtained from 10 to 400 keV. The experimental results were compared with data from several evaluated libraries and previous experiments in the RRR and URR. The TALYS code was used to describe the average cross sections in the URR. The astrophysical Maxwell average cross sections (MACSs) of
$${}^{79,81}$$
Br from kT = 5 to 100 keV were calculated over a sufficiently wide range of neutron energies. At a thermal energy of
$$kT=30$$
keV, the MACS value for
$${}^{79}$$
Br 682±68 mb was in good agreement with the KADoNiS v1.0 recommended value. By contrast, the value of 293±29 mb for
$${}^{81}$$
Br was substantially higher than that of the evaluated database and the KADoNiS v1.0 recommended value.
摘要：
Heat exchangers in natural circulation LBE-cooled fast reactors are used in harsh conditions such as extreme temperatures, significant pressure differences, high density, and corrosive environments. Therefore, heat transfer tube rupture and flow blockage accidents are common and result in an asymmetric heat load or asymmetric resistance thereby significantly impacting the safe and stable operation of the reactor. In this study, SNCLFR-10 has been used as the reference reactor and FLUENT simulation is used to establish the LBE-cooled dual-loop natural circulation system. Consequently, a theoretical solution of the natural circulation flow of a dual-loop system (TSNCD) is deduced using dimensionless analysis. The TSNCD theoretical solution is verified by using a dual-loop natural circulation system established via FLUENT simulation. Subsequently disturbance characteristics of the natural circulation system under different heat load differences or resistance differences are analyzed. The characteristic parameters representing the anti-disturbance capacity of natural circulation are determined using fitting approximation, and the best anti-disturbance interval is obtained. The results show that the TSNCD theoretical calculation formula of dual-loop natural circulation flow is extremely reliable, and the error between the calculations and the FLUENT simulation result is less than 5 %. When an asymmetric heat load disturbance and asymmetric resistance disturbance are incorporated into the system together or alone, the loop flow changes insignificantly in a certain interval; the anti-disturbance capacity of the system is strong in this interval. The resistance of the system to heat load disturbance is 0.2 < k(1) < 0.8, and the resistance disturbance is 0.6 < B < 4.8. When an asymmetric heat load and asymmetric resistance disturbance are simultaneously introduced into the system, an optimal resistance disturbance is achieved (k(1) is an element of[0.40, 0.60] and B is an element of[0.7, 2.9]).
