JOURNAL OF NUCLEAR MATERIALS
·
2020
·
IF 2.485
De–Bin Ji,Pu Wang,De–Qiang Ji,Mi–Lin Zhang,Hong–Jun Wu
In this work, different electrochemical measurements were employed to investigate the electrochemical behavior of La(III) on W and liquid aluminum electrodes, respectively. In LiCl–KCl melts, the diffusion coefficients of La(III) on W electrode at different experimental temperatures were determined by chronopotentiometry. The cyclic voltammetry results obtained on liquid aluminum electrode revealed only one pair of redox signal corresponding to the formation of Al–La intermetallic compound in LiCl–KCl–LaCl 3 melts. The diffusion coefficient of La atom on the liquid Al–La alloy electrode was evaluated by anodic chronopotentiometry at 973 K. The electrochemical extraction of La was realized by galvanostatic electrolysis on a liquid aluminum electrode in LiCl–KCl–LaCl 3 melts at 973 K, and the phases of Al 11 La 3 and Al were identified by XRD . The SEM images disclosed needlelike precipitates in alloy, and the element La mainly distribute in the needlelike precipitates. After electrolysis, the extraction efficiency of element La was evaluated to be 99.4%, indicates that the electrochemical extraction of lanthanum with the help of liquid aluminum cathode is feasible in practice.
研究领域:
冶金学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Haoyu Zhang,Baoguo Zhang,Bing Ai,Kefeng Pan,Weimin Zhang,Lipeng Zhang,Zhongning Shi
The high chemical activity of metallic Li hinders its efficient electrochemical extraction at low temperatures, necessitating the use of energy- and cost-intensive methods such as vacuum thermal reduction or electrodeposition from ionic-liquid and molten-salt electrolytes. Herein, we report the direct room-temperature electrowinning of metallic Li from a simple low-cost electrolyte, namely a solution of LiCl in dimethylacetamide (DMAc), determine the optimal concentration of LiCl, and examine the redox processes in the optimized system. Potentiostatic deposition on high-purity Al is shown to induce solid-state cathode alloying and thus produce a uniform, flat, and dense coating of a LiAl master alloy comprising spherical clusters formed by LiAl alloy nanosheets. Finally, the direct smelting of electrodeposited films is proposed as a method of rapidly realizing the “thin film” to “bulk” transformation of electrodeposited materials to stabilize metallic Li and form bulk Li-based alloys. Thus, this study provides a basis for the continuous, low-cost, sustainable, and fast electrochemical production of bulk active metals or their alloys.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Quanzhang Sun,Ming Gong,Ji Wang,Lifeng Chen,Wenlong Li,Yuezhou Wei
ABSRACT To extract lutetium (Lu) from LiCl-KCl fused salt, the electrode reaction mechanisms of Lu on W and liquid Zn electrodes were systematically investigated using a series of electrochemical methods such as cycle voltammetry (CV), square wave voltammetry (SWV), reverse chronopotentiometry (RCP), etc. The diffusion coefficient and diffusion activation energy of Lu(III) in LiCl-KCl fused salt were measured by CV. The results of CV, SWV and open circuit chronopotentiometry (OCP) confirmed that seven Lu-Zn intermetallic compounds were formed when Lu was deposited on Zn film electrode. Kinetic data of Lu(III)/Lu on W and liquid Zn electrodes, i.e., exchange current density, charge transfer resistance and reaction activation energy, were determined and compared by linear polarization (LP) at 773-848 K. Furthermore, the thermodynamic date such as equilibrium potential and formation Gibbs free energy of Lu-Zn alloys were also calculated and analyzed according to the OCP. The results demonstrate that the liquid Zn electrode is conducive to extract Lu from LiCl-KCl fused salt. Thus, constant potential electrolysis (CPE) was conducted at -1.58 V for 9 h on liquid Zn cathode to extract Lu from fused salt. The electrolytic product was composed of Zn and LuZn12 phases checked by XRD and SEM-EDS. The extraction rate of Lu is reached up to 98.37% based on the concentration change of Lu(III) in fused salt, which confirmed the feasibility to extract Lu employing liquid Zn electrode.
研究领域:
冶金学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2024
·
IF 6.5
Tan Yi,Jun-long Huang,Zong-heng Cen,Yi-wei Ji,Shao-hong Liu
Carbon-based catalysts are promising materials for the electrochemical extraction of uranium from seawater. However, their practical application is often limited by high cost and low catalytic activity. Using low-cost polystyrene sulfonic acid resin and melamine as raw materials, a class of nitrogen and sulfur co-doped carbon nanosheets (CNSs) with high catalytic activity has been developed by a low-temperature hydrothermal treatment and high-temperature carbonization. Because of their high conductivity and high catalytic activity, CNS-based electrodes can catalyze uranyl ions in seawater into easily recoverable Na 2 O(UO 3 ·H 2 O) x precipitates at −2 V, and achieve an extraction capacity of up to 3 923.7 mg g −1 with a uranium removal of 98.1% in uranium-spiked seawater (1×10 3 mg L −1 ). In situ Raman spectroscopy showed that a large number of uranium compounds appeared on the surface of the composite electrode within 40 min of extraction. The electrode also recovered 72.7% of the uranium in natural seawater, demonstrating excellent prospects for this application. This work provides a new approach into the design of low-cost, metal-free electrocatalysts for the efficient uranium extraction from natural seawater.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Baoguo Zhang,Li Wang,Yubao Liu,Yongjian Zhang,Lipeng Zhang,Zhongning Shi
The electrochemical extraction of reactive metals, such as Li, Mg, Al, Ti, and rare-earth metals, from different electrolyte systems at low temperatures has been a longstanding challenge in the field of electrochemical extractive metallurgy. Water is an excellent green solvent; therefore, the electrodeposition of aqueous solutions of reactive metals would be more sustainable than traditional approaches involving molten salts and organic solvents. Inspired by the successful application of water-in-salt electrolytes for battery chemistry, we attempted the electrochemical extraction of metallic Li from water via its deposition on different substrates. We found that Li can be electrodeposited in the form of Li-based alloys and hydroxides, as identified by X-ray diffraction and X-ray photoelectron spectroscopy analysis, under certain conditions, and the mechanisms behind the observed electrochemical behaviour are discussed using different characterisation techniques and density functional theory calculations. In addition, the prospects for the electrodeposition of reactive metals from aqueous solutions are considered, and suggestions for further study are made. Thus, this work provides important insights regarding the electrochemical extraction of reactive metals from water at room temperature, and we believe that this work forms a basis for the development of safer batteries, as well as advanced electrodeposition and electrometallurgy technology.
研究领域:
材料科学
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电化学
·
冶金学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Pan Jia-Xin,Zhao Long-Sheng,Li Zheng,Feng Zong-Yu,Liu De-Peng,Chen Jun,Huang Xiao-Wei
To achieve selective leaching of ion adsorption rare earth, it is necessary to thoroughly reveal the differences in the adsorption mechanisms of aluminum and rare earth elements. In this study, we investigated the adsorption processes of Dy and Al on the surface of K–homoionic kaolinite using batch experiments and sequential chemical extractions. The results revealed that the adsorption of Dy and Al, as well as the desorption of K, followed the Langmuir model. The maximum ion-exchangeable capacity of Dy was higher (9.39 mmol·kg −1 ) than that of Al (6.30 mmol·kg −1 ). The ion exchange stoichiometry ratios of Dy–K and Al–K derived from the Langmuir model were 2.0 and 2.6. The analysis of X-ray absorption fine structure (XAFS) and density functional theory (DFT) revealed that Dy and Al were adsorbed onto kaolinite as outer-sphere hydrated complexes via hydrogen bonds. Dy was adsorbed as [Dy(H 2 O) 10 ] 3+ , and Al was adsorbed as [Al(OH) 2 (H 2 O) 4 ] + . In particular, the adsorption of Al resulted in protonation of the hydroxyl groups on the surface of the kaolinite. Based on the above insights, the higher ion exchange stoichiometry ratios are attributed to closer adsorption distances (6.04 Å for Dy and 3.69 Å for Al) and lower adsorption energies (− 223.72 kJ·mol −1 for Dy and − 268.33 kJ·mol −1 for Al). The maximum ion-exchangeable capacity is related to the change of the surface electrical properties of kaolinite. The zeta potential was increased to − 7.3 mV as the protonation resulted from aluminum adsorption, while Dy adsorption had a minor effect, maintaining a value of − 17.5 mV. Graphical abstract
研究领域:
矿物学
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环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 8
·E226
·
IF 3.12
Donghua Tian,Mingyong Wang,Handong Jiao,Shuqiang Jiao
Electrochemical extraction of titanium using a consumable anode of TiCxOy solid solution has been considered as a low-cost and environmentally friendly method. This method is normally referred to as the USTB process when using TiO2 as the starting material, or as the Chinuka process when using titanium ores as raw materials. However, scaling-up of this process is limited by anode preparation and slow electrochemical dissolution. Here, an arc furnace was used to prepare a Ti2CO solid solution that was cast to form a consumable anode for the electrochemical preparation of metallic titanium in a NaCl-KCl molten salt without low-valance titanium ions. The dissolution potential of the as-prepared Ti2CO solid solution is more negative than that of conventional powder sintering. A constant-current electrolysis was carried out in a NaCl-KCl molten salt at 1023 K. The results indicate that titanium ions were stably dissolved from Ti2CO anode into melts, and then metallic titanium was deposited on the cathode. It was confirmed that the cast Ti2CO solution was a promising consumable anode for the USTB process for stable and effective preparation of metallic titanium.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2017
·Vol. 48
·期 5
·2535-2542
·
IF 1.642
Zhang Zhong-Lin,Zhou Lin-Zong,Ji De-Bin,Yan Yong-De,Hong Wei,Liu Yu-Hui,Wang Pu,Yin Tai-Qi,Zheng Jia-Ning,Xue Yun,Ye Yuan-Feng
Electrochemical behavior of Nd was studied in NaCl-KCl melt on W and Cu electrodes via cyclic voltammetry and chronopotentiometry. Generally, the reduction of Nd 3+ takes place in two consecutive steps in molten chlorides, such as LiCl-CaCl 2 , LiCl-BaCl 2 , CaCl 2 -NaCl, LiCl-KCl melts. However, the reduction of Nd 3+ ions was found to be through a one-step process: Nd 3+ + 3e − → Nd. The co-reduction behavior of Nd 3+ and Cu 2+ ions and the mechanisms of alloy formation were investigated in NaCl-KCl melt on W electrodes at 988 K (715 °C). Four potential plateaus corresponding to four different kinds of Cu-Nd intermetallic compounds were detected. Cu-Nd alloys were prepared on Cu electrodes at 988 K (715 °C) and 1143 K (870 °C). At 988 K (715 °C), Cu 5 Nd phase was identified by X-ray diffraction. The morphology and micro-zone chemical analysis of the alloys were characterized by scanning electron microscopy equipped with energy-dispersive spectrometry. The alloy film was observed on the Cu electrodes. Moreover, at 1143 K (870 °C), a globate bulk Cu-Nd alloy with Cu 5 Nd, Cu 4 Nd, Cu 2 Nd, CuNd, and Cu phases, as liquid in the melt, was obtained at the bottom of the crucible.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Zhaoyang Wang,Wuxia Ge,Wentao Bi,David Da Yong Chen
To address the challenges of low recovery, prolonged extraction times, and environmental pollution caused by toxic solvents in traditional extraction methods, magnetic bead-enhanced deep eutectic solvent mechanochemical extraction was developed for extracting natural products from orange peels. The extraction efficiencies of deep eutectic solvents were experimentally evaluated, and theoretical methods were used to guide solvent selection. Choline chloride-ethylene glycol demonstrated the highest efficiency under the optimal extraction conditions: a molar ratio of 1:2, no water content, a solid-liquid ratio of 0.08 g/mL, and an extraction time of 60 s. The synergy between the deep eutectic solvent and magnetic bead-enhanced the mechanochemical extraction efficiencies. The study also examined the effects of different magnetic bead types and orange peel powder particle sizes on extraction efficiency, finding that a 0.11 mm particle size combined with CIP@SiO 2 yielded the best results. Overall, this study holds promise as an environmentally friendly and efficient extraction method.
研究领域:
食品科学
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环境科学
·
提取技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Li Ding,Xuepeng Wang,Shanxin Yang,Wenda Xu,Yongde Yan,Yun Xue,Fuqiu Ma
In order to reveal the extraction mechanism of Nd on Ga-Al alloy electrode, the electrode reactions and alloy formation between Nd(III), Ga(III) and Al(III) ions in different molten salt systems were studied by multiple electrochemical methods. The cyclic voltammetry curves measured in melts with different concentrations confirmed that only three intermetallic compounds were formed in both Ga-Nd and Al-Nd systems. The preferential interaction of Nd with Ga in Ga-Al-Nd ternary system was further verified by cyclic voltammetry curves with varying potential window. In particular, the co-reduction process of three ions was gradually determined by the comparison of electrochemical behaviour in different melts. In addition, the interfacial reaction of Nd(III) ion on liquid Ga-Al alloy cathode was investigated, and the corresponding exchange current densities were measured through galvanostatic pulse (0.0049, 0.0047, 0.0056 and 0.0055 A cm −2 ) and Tafel method (0.0029 A cm −2 ).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Min Liu,Simin Wang,Wentao Bi,David Da Yong Chen
A deep eutectic system (DESys) is formed when a hydrogen bond acceptor (HBA) is processed with polysaccharide (hydrogen bond donor, HBD) containing plant substance in water to dissolve, extract, and recover the polysaccharide directly, instead of using a traditional deep eutectic solvent (DES). The extraction efficiency is enhanced by the direct formation of the DESys, in a mechanochemical extraction (MCE) system. Key factors affecting the extraction efficiency were systematically studied and optimized. The effects of the DESys on the structure and physicochemical properties of polysaccharides were studied by several analytical techniques. The findings demonstrated that the direct DESys formation extraction efficiency was superior than that of traditional extraction methods while retaining physicochemical properties of polysaccharides. Moreover, the composition of polysaccharides extracted with this method is different from that obtained by conventional methods. The recovery and purification process of polysaccharides is simplified by eliminating the need for an additional HBD.
研究领域:
植物学
·
食品科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yi-Wen Wu,Jie Zhang,Xin-Ran Ma,Jun Cao
An efficient, green, and novel basic deep eutectic solvent (DES)-assisted mechanochemical extraction method, combined with ultrahigh-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry, is proposed for simultaneous extraction and determination of target compounds from functional food. Several parameters are investigated using single - factor optimization, and response surface methodology is employed to determine the optimum extraction conditions. The conditions include a grinding time of 316.29 s, 83.72 μL of DES (K 2 CO 3 and glycerol), and vortex time of 2.408 min. The developed method provides good linearity (R 2 > 0.9958), stable intraday and interday precision ranging from 0.07 % to 3.31 %, high sensitivity (LODs <20.83 ng/mL), and acceptable accuracy with recoveries of 83.75 %–102.02 %. Moreover, satisfactory greenness (0.71) and practicality (72.5) are achieved in terms of the Analytical Greenness metric and the blue applicability grade index. The proposed method notably contributes to the simultaneous extraction and detection of flavonoids and saponins in astragali radix.
研究领域:
分析化学
·
食品科学
·
植物化学
✓ 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）