COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jiao Li,Tianshu Li,Yanwei Zeng,Changcheng Chen,Honglei Guo,Bing Lei,Ping Zhang,Zhiyuan Feng,Guozhe Meng
Magnesium alloys are widely used in aerospace and automobile industries because of their lightweight and high strength properties . However, the occurrence of surface corrosion limits their application. Among the protection methods of magnesium alloys, the sol-gel method has received a growing attention recently because of its green economy, high efficiency, and stability. However, the sol-gel method cannot provide corrosion protection for an extended duration in saline solutions. In this study, a novel sol-gel coating via catechol/lysine (CA/Lys) polymerization has been prepared via a facile method and systematically investigated. The CA/Lys co-deposition process was studied by ultraviolet-visible (UV-Vis) spectroscopy. Corrosion performances of the coating were evaluated in aqueous 0.1 M NaCl by electrochemical impedance spectroscopy (EIS) and hydrogen evolution measurements. The experimental results showed that the CA/Lys-modified sol-gel coating provided corrosion protection for up to 18 days, while the unmodified sol-gel coating failed after only 3 days of testing. The polymerized CA/Lys was adsorbed by and then diffused into the sol-gel coating by filling in the macropores or nanopores and the nano-SiO 2 cross-linked network, greatly improving the compactness of the coating. In addition, albeit the thickness of CA/Lys modified coating being only 9 µm, this material was able to provide a long-lasting corrosion protection. This study introduced a novel approach to greatly improve the corrosion resistance of the sol-gel film for magnesium alloys by adopting phenolamines to modify the sol-gel for anticorrosion. This approach can provide a new strategy for Mg alloy corrosion protection.
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高影响因子
HYDROMETALLURGY
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2022
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IF 4.217
Ruibing Bai,Junfeng Wang,Daoguang Wang,Junjie Cui,Yanqiang Zhang
In view of the complex problems for the ionic liquids (ILs) recovery with the system containing ILs and TBP, this work proposed a NaNTf 2 -based synergistic extraction system, NaNTf 2 + TBP, which could realize the effective reutilization of the extraction system without reducing the lithium separation ability. Under the optimal extraction parameters, the extraction efficiency of Li + exceeded 98%, while that of Mg 2+ was only ~1%. The results of mass spectrometry (ESI-MS) and slope analysis showed that two TBP molecules involved in the extraction process of Li + , and the Li + extraction mechanism obeyed the cation-exchange process. According to the red shift of the FT − IR peak of P O in TBP and the chemical shift changes of P in 31 P NMR, the interaction strength between TBP and different metal ion followed the sequence: E TBP−H >> E TBP−Li > E TBP−Mg > E TBP−K > E TBP−Na . It was also found that after a three−stage countercurrent extraction process, [Li + ] org was 0.42 g L −1 , and the total recovery efficiency of Li + was about 98%. The saturated extraction capacity for Li + could be as high as 5.4 g L −1 , and Li + could be stripped with the aqueous solution containing 0.2 mol L -1 HCl. In addition, the extraction efficiency of Li + was almost not attenuated after 6 extraction cycles. This new extraction system shows a certain industrial application prospect for Li + separation from the salt lake bine with high Mg/Li ratio.
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高影响因子
Inorganic Chemistry Frontiers
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2022
·Vol. 9
·期 20
·5188-5194
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IF 7.779
Zhi Fang,Chun-Li Hu,Wen-Tong Chen,Jiang-Gao Mao
Exploration of short-wave ultraviolet beryllium-free Sr2Be2B2O7-type borates is of great significance to the development of short-wave ultraviolet lasers. As a structural analogy to BeO4, the ZnO4 unit has been demonstrated as a facile building unit for the design of beryllium-free borates with balanced overall performance. Nevertheless, despite the discovery of numerous zincoborates, no Sr2Be2B2O7-type zincoborates with characteristic bilayer structures constituted by ZnO4 and BO3 units have been found, highlighting the great challenge in the design and syntheses of Sr2Be2B2O7-type zincoborates. Herein, two new beryllium-free Sr2Be2B2O7-type zincoborates, namely, Na3AEZn2B3O9 (AE = Mg and Ca), were rationally obtained by a chemical cosubstitution design strategy. With the cosubstitution of Sr2+, Be2+ and out-of-plane bridging O2− of {Sr[Be2(BO3)2O]}∞2− bilayers of Sr2Be2B2O7, Na3AEZn2B3O9 (AE = Mg and Ca) featuring a new Sr2Be2B2O7-type bilayer structure of {Na3[Zn2(BO3)2(BO3)]}∞2− were successfully isolated, indicating the feasibility of chemical cosubstitution for the design of Sr2Be2B2O7-type zincoborates. In particular, Na3CaZn2B3O9 exhibits a wide band gap of 4.43 eV, a moderate birefringence of 0.045@1064 nm and a high melting point of 843 °C, being favorable to practical applications.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 5
·2256-2265
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IF 2.047
Chen Shaoping,Chen Jie,Fan Wenhao,Wang Yaning,Guo Jingyun,Wang Yachao,Jiang Yu,Al-Yusufi Rasha Abdullah Ahmed,Ferhat Marhoun
Mg 2 SiNi 3, is a topologically densely packed intermetallic compound (TCP-IMC) and an excellent diffusion barrier material between nickel and Mg 2 Si-based thermoelectric material. However, even a little migration of the Mg atom from Mg 2 Si to Mg 2 SiNi 3 under the action of a driven force promotes the formation of an Mg deficiency region on the Mg 2 Si side, which destroys the balance of point defects and leads to performance deterioration. In this work, by adjusting the chemical potential of Mg across the Mg x Si 15 Ni 50 /Mg 2 Si ( x = 36, 50, 130) interface, the migration of Mg in thermoelectric material has been suppressed effectively. The results indicate that the contact performance and service stability of the Mg 130 Si 15 Ni 50 /Mg 2 Si interface has been improved by 50% compared to that of Mg 36 Si 15 Ni 50 /Mg 2 Si, which remains quite well after annealing at 400 ℃ for 480 h. TCP-IMC barrier with proper composition is a promising design for the manufacture of TEG interface to ensure its consistency in service especially under a large temperature difference.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2023
·Vol. 332
·期 9
·3741-3752
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IF 1.6
Yusheng Wang,Ying Dai,Wenmei Hu,Jinhua Xie,Qinqin Tao
Two Mg–Al layered bimetallic (hydrogen) oxides with uranium selective deposited space were obtained by intercalating bimetallic (hydrogen) oxides with L-serine with active amino and carboxyl sites, which showed excellent uranyl selectivity from cation mixture solutions of Ni 2+ , Co 2+ , Sr 2+ , Zn 2+ , La 3+ , Gd 3+ , Ce 3+ , and Sn 4+ . It was firstly proved in L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides. The key parameter, maximum uranium uptake amount, reached 1028.37 mg/g for LS-LDH and 1018.50 mg/g for MgAl-LDO/C at pH 4.5. These merits coupling with very high uptake capacity, highly cost effectivity, facile preparation and acceptable recycle performance makes LS-LDH and MgAl-LDO/C promising in the treatment of uranium-containing solutions. The study enables the understanding of selectively treating uranium-containing wastewater with L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides.
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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
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高影响因子
CHEMOSPHERE
·
2021
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IF 7.086
Peng Lyu,Guanghui Wang,Yelin Cao,Bing Wang,Nansheng Deng
The decommissioning of uranium mill tailings (UMTs) is usually accompanied by uranium (U) contamination in soil, which poses a serious threat to human health and ecological safety. In this study, a novel phosphorus-modified bamboo biochar (PBC) cross-linked Mg–Al layered double-hydroxide (LDH) composite (“PBC@LDH”) was successfully prepared by phosphate pre-impregnation and a hydrothermal method with Mg–Al LDH. Physicochemical analysis revealed that phosphorus-containing functional groups and Mg–Al LDH were grafted onto the pristine biochar (BC) matrix. Laboratory-scale incubation and column leaching experiments were performed on the prepared BC, PBC, and PBC@LDH. The results showed that, at a dosage of 10%, the PBC@LDH composite had a commendable ability to immobilize U in soil. After 40 days of incubation with the stabilizer, the more mobile U was converted into immobilized species. Furthermore, during a column leaching experiment with simulated acid rain, the cumulative loss and leaching efficiency of U were remarkably reduced by PBC@LDH treatment compared with the control, reaching 53% and 54%, respectively. Surface complexation, co-precipitation, and reduction described the adsorption and immobilization mechanisms. In conclusion, this research demonstrates that the PBC@LDH composite offers a potentially effective amendment for the remediation of U contaminated soil.
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PubMed
高影响因子
DALTON TRANSACTIONS
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2021
·Vol. 50
·期 25
·8927-8937
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IF 4.39
Ying Liu,Na Wang,Zhongqiao Sun,Yide Han,Junli Xu,Yan Xu,Junbiao Wu,Hao Meng,Xia Zhang
MOF/polymer hybrid membranes integrate the surface activity of MOFs and the advantages of PVDF membranes, and can be used as adsorption membranes in the efficient removal of target organics. In this work, a new hybrid membrane of ZIF-67/PVDF with varying ZIF-67 dosages has been fabricated through a facile mechanical blending followed by a lyotropic phase transition. Methods including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), FT-IR analyses and surface hydrophobicity/hydrophilicity measurements are applied to characterize the structure, physicochemical properties and membrane performances. Two synthetic triarylmethane dyes, cationic malachite green (MG) and anionic fuchsin acid (FA), are chosen as the main adsorption targets to evaluate the adsorption capacities of the resulting ZIF-67/PVDF hybrid membranes. Interestingly, all of the ZIF-67/PVDF hybrid membranes exhibit distinctly favorable efficiencies and selectivities toward MG and FA compared to pristine PVDF, which proves the positive roles of ZIF-67 in the adsorption ability of the hybrid membranes. The adsorption conditions are optimized and the adsorption kinetics and thermodynamics are analysed to study the adsorption mechanism. The reusability and the structural stability of the hybrid membranes undergoing cyclic adsorption processes are also discussed. To the best of our knowledge, this is the first time that good adsorption capacities for MG and FA for these MOF/PVDF membranes have been reported. This work highlights the prospective applications of MOF/PVDF hybrid membranes in the rapid and effective removal of target organics in the treatment of waste water.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Mewin Vincent,Venkata Sai Avvaru,Miguel Castillo Rodríguez,Maciej Haranczyk,Vinodkumar Etacheri
Although Mg–Li hybrid batteries are proposed as an alternative to Mg-batteries, the lack of dual-ion compatible cathodes are limiting their practical application. Herein, we report a high-rate and ultralong-life Mg–Li hybrid battery based on a dual-phase TiO 2 cathode. Highly pseudocapacitive hierarchical two-dimensional TiO 2 consists of anatase (60%) and bronze (40%) nanocrystallites forming interfaces due to crystal structure mismatch. This dual-phase hierarchical cathode exhibits excellent pseudocapacitance (up to 92%), specific capacities (235 mAh/g @ 25 mA/g), rate performance (120 mAh/g @ 1A/g) cycling stability (~87% after 3000 cycles @ 1A/g) and coulombic efficiency (~100%). These results are vastly superior to the previously reported values for TiO 2 based Mg–Li hybrid battery cathodes. Only minimal structural changes are observed during the charge-discharge of two-dimensional TiO 2 electrode. Outstanding electrochemical performance of dual-phase TiO 2 nanosheet cathode is attributed to the superior pseudocapacitive Mg/Li-ion diffusion through nanointerfaces between anatase and bronze crystallites . While other structural features such as 2D-morphology, ultrathin nature, mesoporosity, and high surface area act as secondary factors. The demonstrated approach for efficient pseudocapacitive Mg/Li-ion intercalation enhanced by nanointerfaces can be further exploited in the development of other high performance electrodes for advanced Mg–Li hybrid batteries.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Yiming Wang,Yanchun Yang,Chengjun Zhu,Hongmei Luan,Ruijian Liu,Lei Wang,Chenxi Zhao,Xiaogong Lv
Substitution of Zn with Mg has been reported to suppress CuZn defects, which can improve the photoelectric performance of Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic devices. In our work, the electrical property enhancement of an absorbing layer can be found by incorporating Mg content into the as-prepared precursor solution, forming an alloyed Cu2MgxZn1-xSn(S,Se)4 (CMZTSSe) phase and increasing the photoelectric performance of devices. By adjusting the doping ratio of Mg, we systemically study the impact of Mg content on the crystal structure, thickness, and electrical properties of the Cu2MgxZn1-xSn(S,Se)4 absorbing layer. Also, the photoelectric performance of Cu2MgxZn1-xSn(S,Se)4 solar cells have a large improvement, and the optimal photoelectric conversion efficiency (PCE) of 7.76% for devices is obtained. Our results offer the finding that Mg doping can optimize the electrical properties of Cu2ZnSn(S,Se)4 photovoltaic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiaoning Liu,Junyan Fu,Yiwei Tang,Richard L. Smith Jr,Xinhua Qi
MgO-doped ordered mesoporous carbon (OMC-MgO) was synthesized by evaporation-induced self-assembly (EISA) in one-pot with biomass-derived gallic acid instead of phenolics as carbon precursor, metal ion Mg 2+ instead of formaldehyde as cross-linking agent and F127 as template. Mg had dual roles as cross-linking agent to coordinate gallic acid-F127 micelle composites, and as promoter of active sites. With the developed protocol, MgO could be uniformly dispersed throughout the carbon skeleton during calcination at 800 °C without agglomeration. As-prepared OMC-MgO-T800 had a specific surface area of 808 m 2 /g, a perfectly-ordered mesoporous structure centered at (6–8) nm, and exhibited good performance for phosphorus removal from aqueous solutions with a maximum sorption capacity of 107 mg/g. Electrostatic attraction, ligand exchange, and Lewis acid-base interactions are the main phosphate adsorption mechanisms of the developed MgO-doped OMC adsorbents. The as-prepared mesoporous carbon materials are highly selective for phosphorus adsorption from aqueous streams and are reusable and recyclable. This work proposes a green protocol to synthesize OMC-metal oxide composites that is widely applicable to wastewater treatment and technological areas in catalysis and energy storage.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yanying Bi,Hang Yang,Xiaohan Yun,Hang Zhang,Xiangjie Ma,Guogang Li,Yujun Liang,Yongjun Chen
Currently, the development of highly efficient emission tunable phosphor materials is necessary for improving the lighting quality of UV light based white emitting diodes (WLEDs). Herein, a series of new blue-emitting Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ (CM/ZP: Eu 2+ ) phosphors were successfully synthesized through a high temperature solid phase reaction process. Interestingly, through constructing Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ solid solutions based on a complete substitution of Mg 2+ by Zn 2+ , the controllable blue-shift emission from 441 to 418 nm could be realized. This result could be attributed to the selective occupation of different Ca 2+ ions for Eu 2+ ions due to distortion of coordination polyhedron. The corresponding full width at half maximum (FWHM) exhibits a gradual narrowing from 66 to 27 nm after [Zn→Mg] replacement, and the color purity of Eu 2+ emission in Ca 7 Zn 2 P 6 O 24 (CZP) could reach 93.2%. Finally, the thermal quenching resistance of the as-prepared Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ phosphors show remarkably excellent performance. Moreover, the thermal stabilities working at 150 °C of CMZP: Eu 2+ were gradually improved from 71% for CZP: Eu 2+ to 97% for CMP: Eu 2+ of original photoluminescence intensity. Generally, the cation substation induced selective occupation of Eu 2+ to control FWHM is an efficient design to achieve emission-tunable phosphors, and the developed narrow-band Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ blue-emitting phosphors could serve as potential blue phosphors for WLEDs application.
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