Journal of Sustainable Metallurgy
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2023
·Vol. 9
·期 4
·1456-1465
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IF 2.4
Li Hui-Fang,Li Li-Juan,Ji Lian-Min,Shi Dong
To develop a more stable and more efficient extraction system, a novel amide extraction system, containing extractant N , N -bis(2-ethylhexyl) acetamide (N523) and diluent diisobutyl ketone (DIBK), was proposed in this work. A series of operation conditions, such as the concentration of initial lithium in aqueous phase, the volume ratio of N523 and DIBK, phase ratio of O / A , the molar ratio of Fe/Li, were carried out. The lithium extraction rate reached up to 92% under the optimal extraction conditions. Considering the mass transfer of two phases and consumption of extractant, the three-stage counter-current extraction experiment was conducted. After 6 cycles experiment of the three stage counter-current extraction, the lithium extraction rate reached 99.89% and the separation factor of Li/Mg, Li/Na, Li/K, and Li/Ca were 103,300, 5288, 5233, and 760.4, respectively. The stoichiometry of the complex was LiFeCl 4 ·N523 by the slope method. The results indicated that N523-DIBK extraction system was effective to recovery of lithium from salt lake brine with high mass ratio of Mg/Li. Furthermore, the extraction thermodynamics study revealed lithium extraction was an exothermic process, which meant lower temperature promoted lithium extraction. Graphical Abstract
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Guiquan Liu,Shiyu Li,Rumisa Baikeri,Guorong Wang,Zhiliang Jin
Metal-organic skeleton (MOF) with adjustable pore skeleton and finely reaction sites has been widely accepted in the application of high-performance supercapacitors. Here, the Se-Co-MOF-1 nano-particles obtained by modified doped Se element to Co-MOF and the CoV 3 -MOF nano-sheets obtained by in-situ doped V element in Co-MOF. As a result, Se-Co-MOF-1 and CoV 3 -MOF electrode materials have more electrochemical reactivity, better conductivity and better stability. At a certain current density, Se-Co-MOF-1 and CoV 3 -MOF electrode materials have better mass-specific capacitance and better rate performance than Co-MOF. Furthermore, the Se-Co-MOF-1//AC ASC and CoV 3 -MOF//AC ASC are also assembled, which show relatively excellent power density and energy density compared to similar work reported. The Se-Co-MOF-1//AC ASC and CoV 3 -MOF//AC ASC after 10,000 cycles, their mass-specific capacitance retention rate are still 70.00 %, which further shows the reliable stability of Se-Co-MOF-1 and CoV 3 -MOF electrode materials. This result proves that the synthetic schemes of MOF nano-sheets/nano-particles can be selected as the source of the strategy for preparing excellent electrode materials.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2019
·
IF 5.839
Xianling Wei,Jing Li,Bin Li
The objective of this study was to investigate the effect of concentration of wheat starch (WS) and mass ratio of tannic acid (TA) to WS on interaction between TA and WS, using isothermal titration calorimetry (ITC), UV–vis spectrophotometer and dynamic light scattering (DLS). The interaction process and structural properties of complexes formed with different mass ratios of TA to WS ranged from 0.8 to 2.4 were also investigated through X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and rheological measurements. The results of turbidity, particle size and ITC revealed that TA added into WS could spontaneously form complexes through three steps with the increasing of TA/WS ratio. They were assigned to (i) interaction of TA with WS forming soluble complexes; (ii) propagation and formation of insoluble complexes via cross-linking these soluble complexes; and (iii) lateral association of soluble/insoluble complexes, generating larger aggregates even precipitation. The interaction process would be delayed with decreasing the WS concentration. The results of SEM further revealed the three-step interaction process and showed that the TA/WS complexes appearance was approximately spherical. The results of dynamic rheological, TA loading amount and XPS showed that the complexes had highly intermolecular cross-linked gel-like network structures and contained lower TA inside and higher TA outside.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 10
·A1884
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IF 3.12
Xu Wang,Dawei Gu,Junjie Yu,Hongying Jiang,Hongshun Sun,Lei Wang,Linjiang Shen
Polyaniline and ruthenium oxide electrodes are prepared to assemble the supercapacitors. The electrochemical properties of the electrodes are studied by cyclic voltammetry and galvanostatic charging/discharging measurements. The potential dependence of specific capacitance for the electrodes in the supercapacitors is established. Based on the relationship between specific capacitance and potential of electrodes, the optimum mass ratio of the electrodes in asymmetric supercapacitor of ruthenium oxide//polyaniline can be accurately determined. The working voltage window for ruthenium oxide//polyaniline supercapacitor is significantly increased by the modulation of mass ratio. Accordingly, the electrical energy density of supercapacitor with a mass ratio of = 0.79 is as high as 7.25 Wh kg−1, about 314% higher than that of the supercapacitor with a mass ratio of 0.26.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL SCIENCES
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2019
·
IF 3.197
Xiuxia Wang,Liping Huang,Yiwei Zhang,Fanling Meng,Maria Donoso,Roy Haskell,Liang Luo
The binary-lipid system of soybean phosphatidylcholine (SPC) and glycerol dioleate (GDO) can hydrate to gels on contacting with aqueous mediums, which has emerged as a versatile and promising delivery matrix for extended drug release applications. In the present work, we have characterized the gelation process of this SPC/GDO lyotropic gel (SGLG) system by rheology and evaluated the drug release profiles from the SGLG formulations with different SPC/GDO mass ratios. Our study has demonstrated that simply adjusting the SPC/GDO mass ratio can tune the lipid gelation behavior and modulate the drug release profiles. More importantly, the drug release from the SGLG formulations follows a two-compartment (fast and slow release compartments) release kinetics that has not been reported before. We posit that the fast release compartment corresponds to the passive diffusion of the drug during the early stage of the gel formation. After the boundary gel phase generation, the drug release is then dominated by the slow diffusion process from SGLG. The pharmacokinetic studies in rats match well with the in vitro studies, suggesting that the binary-lipid formulation is an excellent candidate for on-demand sustained drug delivery system.
研究领域:
药剂学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ping Tang,De-Feng Zhou,Xiao-Fei Zhu,Ning Wang,Jing-He Bai
In this paper, the influence of Bi/Zn mass ratio on the phase composition, microstructure, sintering properties, and electrical properties of Bi/Zn co-added Nd 0.2 Ce 0.8 O 1.9 (NDC) used for intermediate-temperature solid oxide fuel cells (SOFCs) was investigated. At 700 °C, the total conductivity of the NDC-based electrolyte (3Bi/1Zn-NDC) with the mass ratio 3:1 for Bi 2 O 3 and ZnO was as high as 5.89 × 10 −2 S cm −1 , 4.60 and 4.51 times higher than the single addition of 4 wt% Bi 2 O 3 and 4 wt% ZnO, respectively. In addition, the 3Bi/1Zn-NDC electrolyte exhibited a good physical and chemical compatibility with the electrode materials. The open circuit voltage (OCV) of the cell supported by the 3Bi/1Zn-NDC electrolyte was 0.67 V, and the output power density could reach 402.25 mW cm −2 at 700 °C. It showed stable power output and OCV in the long-term stability test within 50 h. Overall, the combination of 3 wt% Bi 2 O 3 and 1 wt% ZnO was a very effective dual sintering aid for NDC electrolyte.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dongsheng Jiang,Yuzhe Li,Chao Zhang,Ruifang Wang,Jinpeng Zhu,Wen Chen,Yusi Che,Jilin He
Bayan Obo tailings are rich in niobium and other valuable elements; however, the phase evolution of niobium-bearing slag within these tailings remains poorly understood. This knowledge gap significantly impedes comprehensive utilization of these strategic resources. In this study, a CaO-SiO 2 -Nb 2 O 5 -5%Na 2 O-5%Al 2 O 3 -3%CaF 2 slag system was investigated to examine the phase equilibrium types, compositional characteristics, and distributional evolution under varying w (CaO)/ w (SiO 2 ) ratios and w (Nb 2 O 5 ) contents, using high-temperature equilibrium experiments. Following a 24-hour high-temperature equilibrium treatment at 1473 K under an argon atmosphere, a range of compounds including 13CaO·8SiO 2 ·Nb 2 O 5 ·CaF 2 , 2CaO·4SiO 2 ·Na 2 O·Al 2 O 3 , CaO·Nb 2 O 5 ·NaF, 2CaO·Nb 2 O 5 , and CaO·SiO 2 were identified. An increase in Nb 2 O 5 content coupled with a reduction in the w (CaO)/ w (SiO 2 ) ratio favored the formation of CaO·Nb 2 O 5 ·NaF (pyrochlore phase) and 2CaO·Nb 2 O 5 . These two phases exhibited high Nb concentrations, with the CaO·Nb 2 O 5 ·NaF (pyrochlore) phase containing up to approximately 70% Nb. The optimal smelting conditions for niobium enrichment in the pyrochlore phase were identified within the range of w (CaO)/ w (SiO 2 ) = 0.74∼0.80 and w (Nb 2 O 5 ) = 13.61%∼16.11%.
研究领域:
冶金学
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材料科学
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矿物加工
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
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IF 4.006
Jiao Wu,Yun Duan,Zhaoyin Gao,Xinfeng Yang,Dongxiang Zhao,Jinglin Gao,Wensu Han,Guosheng Li,Shijie Wang
The physicochemical parameters, sugars, minerals and volatile compounds were selected in current work as the crucial parameters for evaluating multifloral honeys produced by Apis cerana cerana Fabricius, Apis dorsata Fabricius and Lepidotrigona flavibasis Cockerell. A summarized physicochemical profile of multifloral honeys exhibited great variability, which was quite different from that of A. mellifera honey, regarding color (83.86–328.36 mmPfund), ash (0.30–0.34 g 100 g −1 ), soluble solid (74.72–80.41 °Brix), diastase activity (5.48–6.70 °Göthe), electrical conductivity (0.40–0.55 mS cm −1 ), free acidity (0.51–0.85 mol kg −1 ), hydroxymethylfurfural (0–39.28 mg kg −1 ), moisture (18.65–23.80%) and pH (3.73–3.95). Fructose and glucose were the major carbohydrates in Apis spp. honeys but high level of maltose was present in L. flavibasis honey. The potassium , zinc and calcium were abundant elements in multifloral honeys. The principal component analysis was applied to discriminate honeys from different bee species by cobalt, sulfur, magnesium, color, maltose, pH, free acidity, potassium, molybdenum, F/G, HMF and iron, and it was concluded that L. flavibasis honey had better quality compared to the other honeys. Moreover, the specific volatile compounds detected in A. dorsata and L. flavibasis honeys were more than A. cerana cerana honey, which could be used as the characteristic markers discriminating honey samples.
研究领域:
农业
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食品科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2024
·
IF 6
Fusheng Sun,Chuanxin Pan,Yantao Liu,Nan Yang
In this research, a novel polysaccharide-based complex system was developed through self-assembly driven by electrostatic interactions between carboxymethyl (CM)-modified tamarind seed polysaccharide (TSP) and chitosan (CS). First, the carboxymethylation of TSP was confirmed successfully. Then, the relationships among the morphology, physicochemical properties and interfacial activity of CMTSP/CS complexes with different mass ratios (1:5, 1:3, 1:1, 3:1 and 5:1) were systematically investigated. The turbidity of the complex solution gradually increased with higher mass ratios (CMTSP:CS) and pH values. The size of the complex initially decreased and then increased as the proportion of CMTSP increased. The CMTSP/CS complex at 1:1 displayed the smallest particle size, supreme surface wettability and strongest interfacial activity. The microstructure and rheological properties of emulsions stabilized by CMTSP/CS complexes were characterized. CMTSP/CS complexes at 1:1 and 1:3 exhibited enhanced emulsifying capacity and better viscoelastic attributes. Remarkably, stable high internal phase emulsions with 85% oil concentration could be formed using very low concentration (only 0.05 wt%). These findings suggest that CMTSP/CS complex-stabilized emulsions have great application potential as a new oil-in-water system.
研究领域:
材料科学
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化学工程
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 14
·8439-8446
·
IF 3.343
ZhiZhong Xie,Caiyun Xu,Lina Zhou,Dan Liu,Chenyang Chen,Haolin Tang,Junsheng Li,Xi Li,Deyu Qu
Summary A hydrogen ion supercapacitor cell was constructed with an electrochemical double-layer carbon material as positive electrode and an electrochemical hydrogen storage composite material as negative electrode. The electrochemical performances of both electrodes and hybrid device were investigated by varying of the mass ratio of positive and negative electrode. It was found to be that both electrodes went through the different hydrogen ion storage processes and the capacity of this hybrid supercapacitor was highly correlated with the negative to the positive electrode ratio. The highest capacity was achieved at ratio of 1:7; further increasing of this ratio may downgrade the performance of the hybrid system. With this optimized ratio, the hybrid device demonstrated good electrochemical performance. Novelty Statement A new hybrid supercapacitor is developed using an electrochemical hydrogen storage cobalt/carbon composite material as negative electrode and a double-layer porous carbon material as positive electrode. In this device, the charge carrier is hydrogen ions generated through the electrolysis of the aqueous electrolyte and, like lithium ion supercapacitor, the H ions rock-chaired between positive and negative electrode during the operation. The structure of this new device is engineered, and the energy storage and conversion mechanisms on both electrodes during the operation are also discussed.
研究领域:
能源材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Chunzhen Fan,Kan Li,Yi He,Yalin Wang,Xufang Qian,Jinping Jia
Although many magnetic chitosan materials have been prepared for adsorption of metal ions , there is no standard method for comprehensive evaluation of material performance. The common practice simply compares either adsorption capacity (Q) or saturation magnetization (M s ) of interested materials; however, these two important parameters often work in opposite way. This study aims to establish two methods for evaluation of the overall performance of magnetic materials. The proposed methods consider both heavy metal ion adsorption capacity and magnetic recovery of the material after use. The first method introduces adsorption recovery index (ARI, ARI = Q t ), which is calculated using Q and recovery time (t) needed for achieving 98% material recovery. Higher ARI value shows better performance of a magnetic material. The second method uses effort-vector data visualization, in which the position of a magnetic material is shown on a coordinate depicted using normalized Q and M s value. The distance of the data point to the target (ideal Q and M s value) indicates the performance of the material. The shorter the distance, the better the overall performance is. Two series of MCBs with different Fe 3 O 4 chitosan mass ratios were prepared by using embedding method and chemical co-precipitation method respectively. They were used as model compounds for investigation of the feasibility of the proposed evaluation methods through adsorption of various metal ions (Ag + , Cu 2+ , Hg 2+ , Cr 3+ and Cr 6+ ) and MCBs recovery test. The best performers were able to be identified by using both methods and the results agreed with each other. Compared with ARI, the effort-vector data visualization was more straightforward and easier to use. This method was successfully applied to evaluate a wide selection of magnetic materials, including those prepared in this work and reported from literatures, for their overall performance.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Yun-fei Zhang,Rui Zhang,Chao-long Yang,Jing Xu,Jian Zheng,Man-geng Lu
Stable acrylate/triethoxyvinylsilane (VTES) core–shell emulsion with different mass ratio of MMA/BA in the core and shell was prepared via a modified micro-emulsion polymerization process. The chemical composition and core–shell structure were investigated by Fourier transform infrared (FTIR) spectrometry, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. Effect of MMA/BA mass ratio in the core and shell on the film-forming ability, surface tension of latex was also studied. Finally, water absorption and thermal stability of the latex films were characterized. It was found that the surface tension of emulsion can be reduced to 32.9 N/m when the MMA/BA mass ratio in the shell is 6/4. The water absorption of the latex film could be improved at a proper mass ratio of MMA/BA in core and shell, but adjusting the mass ratio of MMA/BA in the shell has little influence on the thermal stability of latex film. This work provides a method of preparing environment-friendly latex with low surface tension and excellent water resistance for coating applications by regulating the mass ratio of monomers in a modified micro-emulsion polymerization process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）