摘要：
Activated carbon is widely used in Rn-222 removal. Meanwhile, the regeneration of activated carbon is key to improve its utilization in Rn-222 removal. The goal of this study is to find the most appropriate conditions of the regeneration of activated carbon for the removal of Rn-222 and to provide a reference for the application of microwave-assisted regeneration of saturated activated carbon. In this paper, the self-developed microwave device is used to perform multiple regeneration experiments at different gas flow rates, and the Rn-222 absorption coefficient of activated carbon is determined by dynamic adsorption. The relative standard deviation of 3.4% suggests that the measured dynamic adsorption coefficient is stable, reliable, and well reproducible. When the flow rate is 4 L min(-1), the dynamic adsorption coefficient of Rn-222, generated by the activated carbon after three cycles through open-loop regeneration, reaches the maximum value, around 20.8% higher than the fresh activated carbon. In the closed-loop regeneration mode (6 L min(-1) flow rate), the dynamic adsorption coefficient is 19.1% higher than that of fresh activated carbon. The aperture characterization shows that the micropores are most abundant ranging from 5 to 6 angstrom. Moreover, at 8 and 10 L min(-1), the pore diameter of the activated carbon is in the range of 5 to 6 angstrom, about 20.0% and 30.0% higher than nine cycles. Therefore, three to four cycles times, using closed-loop regeneration at a low gas flow rate (4 L min(-1)) can improve the Rn-222 adsorption and the utilization rate of activated carbon most effectively.
摘要：
Rapid and effective uranium removal and enrichment from water is necessary for sustainable economic development and ecological protection. In this paper, an efficient adsorbent Prussian blue compound, potassium manganese ferrocyanide (KMnFC), was synthesized and characterized for the separation of uranium. Its effectiveness in U(VI) removal and adsorption amount were evaluated using batch static adsorption experiments. The adsorption effect of the compound on U(VI) in aqueous solution was investigated, and the maximum adsorption capacity of the compound was 469.48 mg g−1. The adsorption-diffusion kinetic study showed that liquid film diffusion was the main rate control step. The adsorption process of uranium (VI) on KMnFC is a heat absorption reaction and chemisorption of uranium ions in exchange with potassium ions occurs. Most importantly, the compound is uranium selective, and its uranium removal ability is relatively effective even under high acidity circumstances.
期刊：
Journal of the Korean Physical Society,2022年81(8):739-749 ISSN：0374-4884
通讯作者：
Xue-yu Gong
作者机构：
[Deng, Sheng; Gong, Xue-yu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zheng, Ping-wei] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Lu, Xing-qiang] Yantai Univ, Coll Nucl Equipment & Nucl Engn, Yantai 264005, Peoples R China.
通讯机构：
[Xue-yu Gong] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
Tokamak plasma;Electron cyclotron current drive;The Ohkawa mechanism;The Fisch–Boozer mechanism
摘要：
The expressions of both the Fisch–Boozer and Ohkawa currents are constructed, and a feasible and efficient calculation method is given. Simulation results of the Fokker–Plank code verify the expressions and the calculation method. We calculate and separate the Ohkawa and Fisch–Boozer currents on a single magnetic flux surface of the off-axis position. The Ohkawa current drive mechanism can be made dominant over the Fisch–Boozer mechanism to achieve a high driven current. This can be done by adjusting the parameters of electron cyclotron waves to make the power deposited in the off-axis region of the low-field side.
期刊：
Journal of Solid State Chemistry,2022年312:123247 ISSN：0022-4596
通讯作者：
Guang Hu<&wdkj&>YanFang Liu
作者机构：
[Hu, Weiwei; Chen, Zi; Liu, YanFang] Fac Chem Engn, Huaiyin Inst Technol, Key Lab Reg Resource Exploitat & Med Res, Huaian 223003, Peoples R China.;[Chen, Zi; Wu, Shupeng; Xu, Chenghong; Zhang, Lijing; Zhang, Xinxin; Hu, Guang] Fac Chem Engn, Natl & Local Joint Engn Res Ctr Mineral Salt Deep, Huaiyin Inst Technol, Key Lab Palygorskite Sci & Appl Technol Jiangsu P, Huaian 223003, Peoples R China.;[Wang, Zuocheng] Baicheng Normal Univ, Dept Phys, Baicheng 137000, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Guang Hu; YanFang Liu] K;Key Laboratory of Regional Resource Exploitation and Medicinal Research, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, China<&wdkj&>Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian, 223003, China
作者机构：
[Qing, Tao; Qing, T; Liu, Zhaopeng] China Nucl Power Engn Co Ltd, State Key Lab Nucl Power Safety Monitoring Techno, Shenzhen 518038, Peoples R China.;[Qing, Tao; Qing, T; Tang, Yaqin; Zhang, Li; Hu, Hong] Hunan Inst Technol, Inst Human Factors & Safety Engn, Hengyang 421002, Peoples R China.;[Chen, Shuai] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Qing, T ] C;China Nucl Power Engn Co Ltd, State Key Lab Nucl Power Safety Monitoring Techno, Shenzhen 518038, Peoples R China.;Hunan Inst Technol, Inst Human Factors & Safety Engn, Hengyang 421002, Peoples R China.
关键词：
cognitive behavior;SOP;accident management;nuclear power plant main control room;control team
期刊：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2022年1036:166870 ISSN：0168-9002
通讯作者：
Xilei Sun
作者机构：
[Wang, Chenger; Yu, Jinqiu; Luo, Liang] GRINM Grp Co Ltd, Natl Engn Res Ctr Rare Earth, Beijing 100088, Peoples R China.;[Wang, Chenger; Yu, Jinqiu; Luo, Liang] GRIREM Adv Mat Co Ltd, Beijing 100088, Peoples R China.;[Wang, Chenger; Yu, Jinqiu; Luo, Liang] Res Inst Nonferrous Met, Beijing 100088, Peoples R China.;[Sun, Xilei; Lv, Junguang] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Sun, Xilei; Lv, Junguang] Chinese Acad Sci, Inst High Energy Phys, State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.
通讯机构：
[Xilei Sun] I;Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China<&wdkj&>State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, (CAS), Beijing 100049, China
通讯机构：
[Chang-jun Qiu] S;School of Resource Environment and Safety Engineering, College of Mechanical Engineering, School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
The effects of laser parameters on the microstructure and properties of plasma-sprayed yttrium oxide coating on the graphite matrix were investigated. Tensile strength, porosity, roughness, and scratch meter tests were carried out to evaluate the critical load and mechanical properties of the coating after spraying and laser micro-melting. When the porosity and surface roughness of the coating are minimum, the critical load of the coating is 7.85 N higher than that of the spraying surface. After laser micromelting, the crystal phase of Y(2)O(3) coating surface does not change, the crystallinity is improved, and fine grain strengthening occurs. When the laser power density is 75 W/mm(2), the scanning speed is 30 mm/s, and the defocusing distance is 40 mm, the film base bonding performance and wear resistance of the material reach the maximum value. The failure of Y(2)O(3) coating is mainly due to the degradation of mechanical properties such as film base bonding strength, surface porosity, and surface roughness, which leads to the local collapse of the material. The coating after laser micro-melting only presents particle disintegration at the end of the scratch area.
作者机构：
[Liu, Longcheng] China Inst Atom Energy, Dept Radiochem, Beijing 102413, Peoples R China.;[Meng, Shuo] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Yongmei; Li, YM; Meng, Shuo; Li, Chunguang] Univ South China, R&D & Modelling Ctr Treatment & Disposal Radioact, Hengyang 421001, Peoples R China.;[Li, Yongmei; Li, YM; Li, Chunguang] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Liu, Longcheng] KTH Royal Inst Technol, Dept Chem Engn, S-10044 Stockholm, Sweden.
通讯机构：
[Li, Yongmei] U;[Liu, Longcheng] C;[Liu, Longcheng] K;Univ South China, R&D & Modelling Ctr Treatment & Disposal Radioact, Hengyang 421001, Peoples R China.;Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
摘要：
The stability of a colloidal dispersion has long been expressed in terms of the stability ratio. Based on the available theories of coagulation of colloidal dispersions, a novel expression, complying with the classical definition, is developed for the stability ratio. It accounts for the contributions of both primary and secondary minimum coagulations to the overall rate of coagulations. In addition, it can also be regarded as the result of a combination of the kinetic theory of an ideal gas and the Smoluchowski theory with Fuchs' correction, considering the interaction between identical spherical particles and their surfaces immersed in a symmetrical electrolyte solution. The agreement with experimental data suggested that it is superior to the classical ones in describing the weak dependence of the stability ratio on the particle size and the valence of the counterion, by emphasizing the importance of the secondary minimum coagulation in dispersion stability and the complementation between the two modes of coagulation.
期刊：
JOURNAL OF PHYSICAL CHEMISTRY A,2022年126(3):406-415 ISSN：1089-5639
通讯作者：
Wang, Cong-Zhi;Shi, Wei-Qun
作者机构：
[Xue-Fei Luan; Jian-Hui Lan; Cong-Zhi Wang; Wang, CZ; Zhi-Fang Chai; Wei-Qun Shi; Shi, WQ; Qun-Yan Wu] Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.;[Xue-Fei Luan; Liang-Shu Xia] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhi-Fang Chai] Chinese Acad Sci, Engn Lab Adv Energy Mat, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China.
通讯机构：
[Wang, CZ; Shi, WQ ] C;Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
摘要：
Extraction of uranium from seawater is one of the important ways to solve the shortage of terrestrial uranium resources. Thereinto, the competition between uranyl and vanadium cations is a significant challenge in the commonly used amidoxime-based adsorbents for extracting uranium from seawater. An in-depth understanding of the extraction behaviors of modified amidoxime groups with uranyl and vanadium ions is one of the effective means to design and develop efficient adsorbents for selective uranium sequestration. In this work, we have designed and systematically investigated the alkyl and amino functionalized amidoxime, (Z)-2-amino-N'-hydroxy-N,N-dimethylbenzimidamide (L(1)), and its phenyl and methoxy derivatives ((Z)-3-amino-N'-hydroxy-N,N-dimethyl-2-naphthimidamide (L(2)) and (Z)-2-amino-N'-hydroxy-4-methoxy-N,N-dimethylbenzimidamide (L(3))) by quantum chemistry calculations. In the uranyl complexes, the amidoxime groups prefer to act as η(2)-coordinated ligands as the amidoximes increase, and there exist substantial hydrogen bond interactions, which are different from the vanadium complexes. Various bonding analyses show that the L(1) ligand possesses a stronger binding affinity to UO(2)(2+), and the -C(6)H(5) and -CH(3)O substituent groups seem to have no effect on the improvement of extraction ability. Thermodynamic analysis confirms that the L(1) ligand has a stronger extraction capability to uranyl ion compared to L(2) and L(3). According to the calculations of the vanadium (V) (VO(2)(+) and VO(3+)) complexes with the L(1) ligand, L(1) is more likely to react with [H(2)VO(4)](-) and [HVO(4)](2-) to form VO(2)(+) complexes. Expectantly, thermodynamic analysis displays a higher extraction capacity for uranyl ions than vanadium ions. Therefore, these alkyl and amino functionalized amidoxime ligands demonstrate high selectivity for uranyl over vanadium ions, which is mainly due to the coordination mode changes of these ligands toward vanadium in conjunction with the considerable hydrogen bonds in the uranyl complexes. These results are expected to afford useful clues for the design of efficient adsorbents for uranium extraction from seawater.
通讯机构：
[Xinpeng Wang; Shunyan Ning] S;School of Resources, Environment and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, 100 Daxue Road, Nanning, 530004, PR China<&wdkj&>School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, PR China
摘要：
Effective and efficient disposal of radioactive pollution has been crucial for responding to unexpected nuclear accidents and guaranteeing the sustainable development of nuclear energy. In this study, a kind of porous zirconium phosphate was synthesized with a sol-gel process followed by a post-synthesis modification to remove the radioactive Sr(2+) from wastewater. The prepared materials were characterized by different technologies including FT-IR, SEM-EDS, XRD and XPS, and then the adsorption performance was evaluated in batch and column modes. Experimental results suggested that the porous zirconium phosphate adsorbent was successfully prepared with Na(+) dispersed in the channels for exchange. It inherited the excellent properties of zirconium dioxide aerogel and exhibited mesoporous structure and large specific surface area. Compared with traditional zirconium phosphate, the adsorption kinetics and the adsorption capacity were improved simultaneously. Especially, it showed excellent selectivity towards Sr(2+) among different cations, and even could remove the low-level Sr(2+) from natural seawater efficiently, which powerfully demonstrated that the prepared material could be applied in the treatment of practical wastewater. Spectra studies uncovered that the adsorption activities were dominated by the ion exchange mechanism between external Sr(2+) and interlaminar Na(+) or H(+). In conclusion, this paper not only reports a novel synthesis strategy for the acquisition of porous zirconium phosphate, but also presents a promising adsorbent for the Sr(2+) removal.
摘要：
KYLIN-V2.0 is an advanced lattice code developed in Nuclear Power Institute of China. The subgroup method, MOC method and Chebyshev rational approximation method (CRAM) are applied in the resonance, transport and burnup calculation to provide the macro cross-section library. In this paper, several critical experiments and burnup benchmarks, including B&W critical experiment, KRITZ critical experiment and Takahama-3 burnup benchmark, are applied in the validation of KYLIN-V2.0. KYLIN-V2.0 is validated by 21 cases in B&W-1484, 23 cases in B&W-1810 and 16 samples in Takahama-3. Eigenvalue, pin power distribution and nuclides density results of these cases show the good consistency compared with measured data. The KYLIN-V2.0 code shows good heterogeneous calculation ability for two-dimensional lattices.
摘要：
Analyzing the radiation spectra of impurity ions is a widely applied diagnostic scheme for plasma ion temperature and rotation measurements on tokamaks. High precision wavelength calibration is a prerequisite for the accurate measurement of plasma parameters, especially for plasma rotation. Furthermore, the sparseness or absence of the standard spectral lines brings calibration challenges due to the narrow wavelength range. A precise wavelength calibration method is demonstrated in which the comb-like spectra generated by the Fabry–Pérot etalon can lock a series of fixed peaks as reference points in a wide wavelength range. The equal frequency intervals of the comb-like spectra are further corrected using several characteristic neon lines of known wavelengths. The experimental results indicate that the wavelength accuracy obtained by this calibration method is less than 0.005 nm, which corresponds to a rotation speed of 2.3 km/s in the toroidal direction for the beam emission spectroscopy spectrometer installed on the experimental advanced superconducting tokamak. Taking the O V(650.024 nm, n = 4 → 3) line as an example, the maximum difference in the oxygen ion rotation velocity is 3.8 km/s for the absolute rotation of ∼25 km/s, when compared with the calibration results of a standard lamp.
作者：
Hamza, Mohammed F.;Mira, Hamed;Wei, Yuezhou;Aboelenin, Salama M.;Guibal, Eric;...
期刊：
Chemical Engineering Journal,2022年441:135941 ISSN：1385-8947
通讯作者：
Wei, Yuezhou(yzwei@usc.edu.cn)
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Mira, Hamed; Hamza, Mohammed F.] Nucl Mat Author, POB 530,El-Maadi, Cairo, Egypt.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Aboelenin, Salama M.] Turabah Univ Coll, Taif Univ, Biol Dept, At Taif, Saudi Arabia.;[Guibal, Eric] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.
通讯机构：
[Yuezhou Wei] S;[Eric Guibal] P;School of Nuclear Science and Technology, University of South China, Heng Yang 421001, PR China<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, PR China<&wdkj&>Polymers Composites and Hybrids (PCH), IMT Mines Ales, Alès, France
关键词：
At pH 2.2 sulfonated chitosan selectively recovers lithium from acidic leachate of mobile phone Li-ion battery (for sustainable valorization of strategic metal);High stability in performances of sorption and desorption for eighteen cycles;Lithium sorption remains highly selective for Li(I) against alkali-earth and heavy metals;The sulfonation of chitosan strongly enhances the recovery of lithium from aqueous solutions;Uptake kinetics are fitted by the pseudo-first-order rate equation and sorption isotherms by the Langmuir dual site equation
摘要：
Separation and recovery of palladium from industrial waste is an environmental way to utilize the valuable secondary resources. Metal-organic framework (MOF) has a great potential for the adsorption of Pd(II) from aqueous solutions, but the tiny powder form of MOF restricts its practical applications. In this work, a feasible and green method is developed to prepare novel MOF composite beads (B-MOF) with a stable cross-linked network. The adsorption performance of B-MOF for Pd(II) was evaluated in acidic solutions. Comprehensive characterization results show that the structure of B-MOF is stable throughout the adsorption process. At pH 3.0, the adsorption capacity of Pd(II) on B-MOF was high up to 334.68 mg.g(-1), exhibiting superiority to most of the other congeneric adsorbents. The adsorption behavior accorded with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm, which was a spontaneous and endothermic chemisorption process. Moreover, the adsorption performance of B-MOF persisted almost unchanged even after 12 regeneration cycles. B-MOF also demonstrated high selectivity to Pd(II) in the presence of interfering ions, including Na(I), K(I), Ni(II), Mg(II), Cu (II), Zn(II), Co(II), Ca(II) and Al(III). Mechanism studies reveal that Pd(II) can be adsorbed on B-MOF by the inner-sphere complexation to Zr-nodes and the electrostatic attraction with protonated amine groups. The recovery of Pd from a real industrial waste was successfully achieved with a recovery rate of 92.5 %. This study provides an effective method to improve the practicability of MOF-based materials and may open a new way for the disposal of industrial waste containing palladium.
通讯机构：
[Guoqiang Zhang; Wenjun Ma] S;State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University , Beijing 100871, China<&wdkj&>Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800, China
摘要：
In this work, the high-energy-density plasmas (HEDP) evolved from joule-class-femtosecond-laser-irradiated nanowire-array (NWA) targets were numerically and experimentally studied. The results of particle-in-cell simulations indicate that ions accelerated in the sheath field around the surfaces of the nanowires are eventually confined in a plasma, contributing most to the high energy densities. The protons emitted from the front surfaces of the NWA targets provide rich information about the interactions that occur. We give the electron and ion energy densities for broad target parameter ranges. The ion energy densities from NWA targets were found to be an order of magnitude higher than those from planar targets, and the volume of the HEDP was several-fold greater. At optimal target parameters, 8% of the laser energy can be converted to confined protons, and this results in ion energy densities at the GJ/cm3 level. In the experiments, the measured energy of the emitted protons reached 4 MeV, and the changes in energy with the NWA’s parameters were found to fit the simulation results well. Experimental measurements of neutrons from 2H(d,n)3He fusion with a yield of (24 ± 18) × 106/J from deuterated polyethylene NWA targets also confirmed these results.
作者机构：
[Wang, Xinpeng; Fujita, Toyohisa; Ning, Xiaomei; Wang, Xianran; Wang, Dengpeng; Gao, Feng; Wang, Kaituo] Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;[Wang, Xinpeng; Fujita, Toyohisa; Ning, Xiaomei; Wang, Xianran; Wang, Dengpeng; Gao, Feng; Wang, Kaituo] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Toyohisa Fujita; Feng Gao] A;Authors to whom correspondence should be addressed.<&wdkj&>Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi University, Nanning 530004, China<&wdkj&>School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
