JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·E616
·
IF 3.662
Junfeng Li,Mingyong Wang,Jiguo Tu,Shuqiang Jiao
The direct preparation of metallic Sm or alloys from raw oxide Sm2O3 is an attracting but challenging process. The stable electrochemical behavior and low solubility of Sm2O3 limit the extraction of Sm element in molten salts. Here, it is found that metallic Sm is hardly obtained by electro-deoxidation and aluminothermic reduction of solid Sm2O3 pellet according to experiment and calculation. Through the novel electrochemical reduction of solid Sm2O3-Al pellet, Al3Sm alloy with ∼0.4 Sm/Al molar ratio is successfully prepared in calcium chloride melt at 1173 K. The reduction potential of Sm2O3-Al pellet to Al-Sm alloy is more positive than that of calcium. Al plays an indispensable role in the reduction of Sm2O3. The preparation process of alloy can be well identified as two steps: Sm(III) → Sm(II) and Sm(II) → Sm(0). Sm2O3 is firstly converted to Sm(II) based on the combination of electrochemical and aluminothermic reduction. Then, Al3Sm is formed by electrochemical reduction and alloying with Al.
研究领域:
材料科学
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电化学
·
冶金学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Laigang Hu,Weiwei Wang,Xiaozeng Miao,Min Hu,Dong Luo,Wenhao Wu,Daohui Lin,Kun Yang
Benzene (Bz) vapor poses significant health risks to humans, even at trace concentrations. Additionally, the separation and recycling of Bz and cyclohexane (Cy) is challenging due to their similar kinetic diameters and boiling points. Developing an adsorption-separation material with stronger interactions with Bz than with Cy could serve as a viable strategy for trace Bz adsorption and Bz/Cy separation. In this study, we present a novel aluminum-based metal–organic framework, ZJU-521(Al), composed of tetrakis (4-carboxyphenyl)methane and a helical chain [Al 5 (OH) 7 (−COO) 8 ] ∞ , featuring a simple network of one-way rods and tetrahedra. This framework exhibited a uniform micropore size of 7.23 Å and a specific surface area of 1,248 m 2 g −1 , demonstrating excellent trace Bz adsorption (4.18 mmol g −1 ) at P/P 0 = 0.01, attributed to its straight channel and orthogonal-array pocket pore structure. The ideal adsorbed solution theory selectivity and separation factor values of ZJU-521(Al) for Bz/Cy were 22.50 and 6.20, respectively, indicating its potential as a material for Bz/Cy separation. Multicomponent simulations showed that Bz molecules were preferentially adsorbed in the pocket due to stronger interactions, such as Al–π interactions. Thus, ZJU-521(Al) exhibits stronger interactions with Bz than with Cy, facilitating effective Bz/Cy separation.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 89
·73068-73076
·
IF 3.84
Lifang Zhu,Hongwei Yu,Huijuan Zhang,Jiangnan Shen,Lixin Xue,Congjie Gao,Bart van der Bruggen
Aromatic poly(m-phenyleneisophthalamide) (PMIA) and the metal-organic framework (MOF) MIL-53(Al) were employed as the polymer matrix and additive, respectively, to develop mixed matrix membranes (MMMs) via non-solvent induced phase separation for potential application in organic solvent nanofiltration. The prepared membranes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and water contact angle measurements. The membrane water permeance enhanced when MIL-53(Al) was incorporated into the membrane structure while the rejection had no significant change. The optimum MMM (with 0.5 wt% MOF concentration) passes mono and bivalent inorganic salts but rejects larger charged organic molecules and has a mean effective pore size of 0.7 nm. The influence of organic solvents on MMM performance was also investigated and the result shows that the performance shifts towards a lower pure water permeance and a higher rejection after exposure to organic solvents (ethyl acetate or methanol). The membrane performance in organic solvent nanofiltration was evaluated on the basis of the permeance and rejection of brilliant blue G in ethanol, and the result showed that the permeance of MMMs significantly increased (by 289%) while the rejection slightly reduced by 4% in contrast to the pure membrane.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2019
·Vol. 21
·期 12
·1900825
·
IF 2.906
Yaofeng Mao,Lin Zhong,Xu Zhou,Dawei Zheng,Xingquan Zhang,Tao Duan,Fude Nie,Bing Gao,Dunju Wang
The booming development of 3D printing offers unprecedented hope for the construction of functional materials. However, it is still challenging to fabricate nano energetic materials due to the high sensitivity of energetic materials and the difficulty of high loading of materials. Recently, ink-based direct ink writing (DIW) 3D printing process for the preparation of reactive materials has attracted worldwide attention because of the simplicity in design of micro architecture and the possibility of low-cost manufacturing. Herein, a novel strategy for printing Al/CuO nanothermite is successfully achieved by DIW 3D printing of nanothermite inks with good rheology shear-thinning properties using F 2311 as a binder. The loading of nanothermite in this ink formula is up to 90 wt.%, and the burning rate can be as high as 352 mm s −1 . This approach provides new routes for achieving the applications in micro energetic device by printing high resolution and precise patterns of nanothermite with enhanced combustion performance.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 6
·1591-1604
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IF 2.372
Du Boyu,Chen Changzhou,Sun Yang,Liu Bingyang,Yang Yingying,Gao Si,Zhang Zhenshu,Wang Xing,Zhou Jinghui
Abstract Catalytic depolymerization of lignin to produce bio-oil, liquid fuels, and aromatic chemicals in high yields is important for a biorefinery to remain competitive. In this study, undoped and Ni-doped catalysts for depolymerization of rice husk lignin (RHL) were developed and analyzed. The results showed that the catalysts had hydrotalcite-like structures with lamellar morphology. With suitable Ni-doping amount, the catalysts had high activity, thus better promoted the depolymerization of RHL. Among all catalysts, the Ni1/4MgAl catalyst could best promote the cleavage of the β-O-4 aryl ether bond in RHL molecule and thus could substantially increase the yields of bio-oil. The depolymerization catalyzed by this catalyst was also found to be temperature-, time-, and solvent-dependent. This study provides information that can be beneficial to the biorefinery industries and may help promote the valorization of lignin. Graphic Abstract
研究领域:
生物质能
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催化化学
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可再生资源
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产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 3
·438
·
IF 4.324
Jianian Hu,Jian Zhang,Guoqiang Luo,Yi Sun,Qiang Shen,Lianmeng Zhang
This research presents an approach for C-O grain boundary strengthening of Al composites that used an in situ method to synthesize a C-O shell on Al powder particles in a vertical tube furnace. The C-O reinforced Al matrix composites (C-O/Al composites) were fabricated by a new powder metallurgy (PM) method associated with the hot pressing technique. The data indicates that Al4C3was distributed within the Al matrix and an O-Al solution was distributed in the grain boundaries in the strengthened structure. The formation mechanism of this structure was explained by a combination of TEM observations and molecular dynamic simulation results. The yield strength and ultimate tensile strength of the C-O/Al composites, modified by 3 wt.% polyvinyl butyral, reached 232.2 MPa and 304.82 MPa, respectively; compared to the yield strength and ultimate tensile strength of the pure aluminum processed under the same conditions, there was an increase of 124% and 99.3%, respectively. These results indicate the excellent properties of the C-O/Al-strengthened structure. In addition, the strengthening mechanism was explained by the Hall–Petch strengthening, dislocation strengthening, and solid solution strengthening mechanisms, which represented contributions of nearly 44.9%, 15.9%, and 16.6% to the total increased strength, respectively. The remaining increment was attributed to the coupled strengthening of the C and O, which contributed 20.6% to the total increase.
研究领域:
材料科学
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力学
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纳米技术
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
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2024
·
IF 1.8
Yiting Wang,Mingze Xu,Jinhua Li,Tingsong Zhang
Titanium dioxide (TiO2) has been widely studied as a photocatalyst owing to its advantages of low cost, good stability, and nonpollution. However, they can only be excited by ultraviolet light, resulting in low utilization of solar energy and limited photocatalytic efficiency. In recent years, researchers have found that the nonprecious metal Al can effectively improve the photocatalytic performance of TiO2. However, the current studies focus only on enhancing the ultraviolet photocatalysis performance of semiconductors with Al on the substrate. In this study, Al nanoparticles (NPs) and TiO2 were prepared into composite materials. The effects of ligand, Al particle size, and the molar ratio of Al and TiO2 on the photocatalytic degradation of methylene blue (MB) by Al NPs and TiO2 composites (Al NPs/TiO2) were investigated. The results showed that the Al NPs/TiO2 prepared with a particle size of 200 nm of Al, glutathione as the ligand bridge, and an Al:TiO2 ratio of 2:1 were the most effective for the degradation of MB. The degradation rate of 5 mg/L MB solution within 70 min under visible light was up to 99.5%, which was three times higher than that of P25 TiO2. The photocatalytic performance was further enhanced under sunlight with a degradation rate of 99.7% within 50 min, which is four times higher than that of P25 TiO2 under the same light source. Therefore, Al NPs/TiO2 is a potential photocatalytic material for the treatment of organic pollutants in water.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Yuan Cai,Xiaofeng Xu,Hu Wang,Lei Wang,Lulu Chen,Rui Li,Jing Ding,Hui Wan,Guofeng Guan
Production of alternative, clean aviation fuel from biomass synthesis gas via Fischer–Tropsch (FT) synthesis has attracted much attention. In this paper, Al-SBA-15 supported cobalt catalysts with different Al/Si ratios were successfully prepared for the production of aviation fuel by FT synthesis. The physical and acidic properties of the Co/Al-SBA-15 catalysts were characterized by XRF, XRD, N2 adsorption–desorption, TEM, H2-TPR, 27Al NMR, NH3-TPD, and Py-FTIR. The formation of long-chain hydrocarbons was inhibited by the ordered mesoporous structure. Fischer–Tropsch activity and selectivity were demonstrated to be affected by the acidity of the Al-SBA-15 supports. The selectivity turned to lighter iso-paraffin products. Co-based catalyst with Al/Si ratio of 0.01 exhibited the highest selectivity (52.4%) for aviation fuel (C8–C18 products) and much higher ratio of iso-paraffin/normal-paraffin (iso/n) (20.2%). This study might provide useful information for the selective production of aviation fuel via FT synthesis.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Xinyue Yang,Yong Li,Deyun Yue,Rui Li,Haojie Song
The construction of ternary heterojunction photocatalysts can achieve multi-gradient transfer of charges and accurate control the position of photogenerated electrons which has received increasing attention. In this paper, NH 2 -MIL-53(Al)@BiOBr@CQDs-10 % (ABCQDs-10 %) was prepared via a facile hydrothermal and chemical synthesis processes. Three-dimensional serration of NH 2 -MIL-53(Al) as a platform for irregular BiOBr nanosheets, CQDs promote interfacial contact and act as electron transport channels between BiOBr and NH 2 -MIL-53(Al) and constitute Z-type heterojunctions with high redox properties. ABCQDs-10 % shows the best photocatalytic removal efficiency (94.24 %) of CIP, the reaction rate constants (0.045 min −1 ) were 1.2 and 64 times higher than BiOBr and NH 2 -MIL-53(Al), respectively. The excellent degradation performance is attributed to the construction of Z-type heterojunction of NH 2 -MIL-53(Al)@BiOBr@CQDs which improve electron-hole separation and transfer efficiency. The main active species was •O 2 - . The photocatalytic activity of ABCQDs-10 % had not obvious loss after cycle experiments and the crystal structure had no significant changes, means high stable photocatalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 21
·5103-5113
·
IF 9.125
Ying Duan,Min Zheng,Dongmi Li,Dongsheng Deng,Lu-Fang Ma,Yanliang Yang
The catalytic conversion of HMF to 2-hydroxy-3-methyl-2-cyclopenten-1-one (MCP), which is a valuable edible essence that has traditionally been obtained from adipic acid, was achieved with an isolated yield of 58%. This procedure comprised two steps: the hydrogenation of 5-hydroxymethylfurfural (HMF) to 1-hydroxy-2,5-hexanedione (HHD) in water on Pd/Nb2O5 catalysts and then the isomerization of HHD to MCP in the presence of a base. The Nb2O5 supports, which were acidic, were characterized by FTIR, XRD and NH3-TPD. The supported Pd/Nb2O5 catalysts, in which Pd was highly dispersed, were synthesized employing cyclohexene as a reductant and were characterized by XRD, TEM, ICP-AES, XPS, EDX and CO pulse chemisorption. The high conversion of HMF was attributed to the high dispersion of Pd, and the acidity of the supports led to high selectivity for HHD. The conversion of HHD to MCP was an intramolecular aldol condensation reaction, and the protonic solvent favored this reaction. Ca–Al was proved to be an effective solid base for the conversion of HHD to MCP in water.
研究领域:
化学工程
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Tongtong Han,Yuanlong Xiao,Minman Tong,Hongliang Huang,Dahuan Liu,Luyan Wang,Chongli Zhong
A series of CNT@MIL-68(Al) composites with different carbon nanotubes (CNTs) loadings have been synthesized and characterized by SEM, TEM, PXRD, FT-IR, TGA, and N 2 adsorption. As evidenced from SEM and TEM images, the incorporation of CNTs can result in better dispersity of MIL-68(Al) in composites and smaller particle size than pure MIL-68(Al). Adding appropriate amounts of CNTs increases both the BET surface areas and the total volume of small micorpores (<16 Å), leading to largely improved performance of adsorptive removal of phenol from aqueous solution. In the industrial concentration range of phenol, the adsorption capacity of 0.75% CNT@MIL-68(Al) was improved up to 188.7% compared with the pristine MIL-68(Al), possibly due to the increase of small micropores introduced by the incorporation of CNTs. Regeneration experiments demonstrated that the composites are stable with good regenerability for at least five cycles. This work shows that the composites formed by the combination of CNTs and MOFs may find promising applications in liquid phase adsorption.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2019
·
IF 2.284
Ning Tian,Yifang Dai,Qing Liu,Wei Dai
A general synthetic strategy for HS-Fe 3 O 4 @MIL-53(Al) adsorbent has been developed in this work. The composite material exhibits an efficient capture performance for rubidium ion due to sulfhydryl group and magnetic Fe 3 O 4 doped in its porous cavity. The results of X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 adsorption–desorption proved that the HS-Fe 3 O 4 was immobilized in the composite material. High Rb + uptake capacity over the HS-Fe 3 O 4 @MIL-53(Al) is attributed to the exchange of acidic protons between the sulfhydryl group and the Rb + . The pseudo-second-order and Freundlich model could make a good description of the adsorption process. The Rb + sorption selectivity was moderately influenced by any co-ions effect (K + , Na + and Cs + ) due to HS-Fe 3 O 4 doped. These results reveal that our novel composite material might be a promising industrial adsorbent for Rb + capture.
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
危险品化学品经营许可证（带存储）