CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ting Du,Jing Wang,Liang Zhang,ShaoChi Wang,Chengyuan Yang,Linxuan Xie,Zhaoli Liu,Yongsheng Ni,XiangHong Xie,Jing Sun,Wentao Zhang,Jianlong Wang
The creation of defects into luminescent MOFs allows for manipulation of fluorescent properties and thus leads to the enhanced detection performance for technological applications. Herein, a modulator-induced defect formation strategy was proposed to introduce missing-linker defect into lanthanide-based metal–organic framework (Eu@UiO-MOFs) and the enhanced detection properties was investigated. Notably, the missing-linker numbers in per Zr 6 cluster were calculated to facilitate comparison and quantitively interpretation. By elaborately tailoring defect numbers, the resultant Eu@UiO-MOFs-2 sensor with 0.53 missing linkers per Zr-O cluster showed a remarkably enhanced response slope and realized excellent trace detection under the range of 0–10 ppm with ultralow detection limit to 5.67 × 10 −7 M (114 ppb), acting as a powerful signal amplifier for trace detection of Cd 2+ . Moreover, the relationship between structural change and defect numbers of Eu@UiO-MOFs-X has been studied to understand the positive effect of the improved enrichment for the optical behavior. As far as we know, this is the first experimental demonstration of missing-linker defects in luminescent MOFs for regulation of optical sensing, offering a unique approach to explore innovative technologies for precisely detecting of heavy metal ion pollutants.
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高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Mei-Ling Xu,Xiao-Jie Jiang,Jia-Ran Li,Fu-Ji Wang,Kui Li,Xin Cheng
Considering the flexibility, adjustable pore structure, and abundant active sites of metal–organic frameworks (MOFs), rational design and fine control of the MOF-based hetero-nanocrystals is a highly important and challenging subject. In this work, self-assembly of a 3D hollow BiOBr@Bi-MOF microsphere was fabricated through precisely controlled dissociation kinetics of the self-sacrificial template (BiOBr) for the first time, where the residual quantity of BiOBr and the formation of Bi-MOF were carefully regulated by changing the reaction time and the capability of coordination. Meanwhile, the hollow microstructure was formed in BiOBr@Bi-MOF through the Oswald ripening mechanism to separate photogenerated electron–hole pairs and increase the adsorption capacity of Bi-MOF for dyes, which significantly enhanced the photocatalytic degradation efficiency of RhB from 56.4% for BiOBr to 99.4% for the optimal BiOBr@Bi-MOF microsphere. This research broadens the selectivity of semiconductor/MOF hetero-nanocrystals with reasonable design and flexible synthesis.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Wenbo Chen,Zhenguo Zhang,Cancan Yang,Jing Liu,Hongcheng Shen,Kai Yang,Zhe Wang
In this work, we fabricated PIM-based mixed matrix membranes (MMMs) containing MOF-801/ionic liquid nanocomposites to enhance CO 2 separation performance of pure polymer membranes. All membranes and MOF-801/ionic liquid nanocomposites were prepared by solution casting method and wet impregnation, respectively. The samples were analyzed by SEM, XRD , FTIR, TGA and Nitrogen adsorption-desorption measurements. The nanocomposites are composed of metal-organic framework (MOF) MOF-801 and ionic liquid (IL) adsorption capacity. MOF-801 can well control the dispersion of IL in the polymer matrix , which is conducive to exposing more active sites in the nanocomposites to improve the CO 2 adsorption selectivity of MOF-801/ionic liquid nanocomposites. At the same time, the porous structure of nanocomposites also enhances the gas adsorption and diffusion, thereby improving the gas separation performance. Compared with pure PIM-1 membranes, the CO 2 permeability and CO 2 /N 2 selectivity of IL@MOF/PIM-5% MMMs was increased by 129% and 45% (CO 2 = 9420 Barrer, CO 2 /N 2 = 29）, respectively. Compared with MOF-801/PIM-1 MMMs, the permeability of CO 2 decreased slightly but the selectivity of CO 2 /N 2 increased from 27 to 29. The aging test showed that the CO 2 permeability of MMMs could remain above 70% after 90 days. The anti-plasticization performance of MMMs has also been significantly improved. The CO 2 separation performance of IL@MOF/PIM-5% MMMs significantly exceeded the 2008 Robeson upper bound, showing excellent gas separation performance and working stability.
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高影响因子
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Xiao-Yang Zhao,Jia Wang,Hai-Gang Hao,Hui Yang,Qi-Shan Yang,Wen-Yuan Zhao
Sensitive, efficient and rapid detection of 2, 6-pyridinedicarboxylic acid (DPA), commonly labeled as the main biology marker for bacillus anthracis, is of far-reaching consequence to eliminate potential threats. In this work, a 3D Eu-MOF ([Eu(DHBDC) 1.5 (DMF) 2 ]·DMF) that has outstanding thermal and water stability was synthesized. The Eu-MOF showed characteristic fluorescence at 506 nm caused by ligand π-π* transition. The quantum calculation showed that there was a large energy difference between the 5 D 0 level of Eu 3+ and the triplet energy level of 2,5-dihydroxy terephthalic acid ligand (DHBDC 2- ), which was why the coordination compound did not exhibit the characteristic fluorescence of Eu 3+ . Interestingly, it effectively restored the red fluorescence of Eu 3+ (593, 618 and 699 nm) and showed a dual-emission fluorescence response at 506 and 593 nm when the DPA existed. Therefore, based on the high detection sensitivity of Eu-MOF (the detection limit is 1.3 μM) and outstanding anti-interference ability, it is expected to become a prospective ratiometric fluorescence sensor for the detection of DPA. In addition, combined with density functional theory (DFT) and a variety of other analytical methods, the detection mechanism of DPA by Eu-MOF was investigated in detail.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ruixia Yang,Qiaohong Peng,Bing Yu,Youqing Shen,Hailin Cong
Yolk-shell Fe 3 O 4 @MOF-5 nanocomposites were synthesized by utilizing a simple solvothermal method. The physicochemical properties of the yolk-shell Fe 3 O 4 @MOF-5 nanocomposites were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) and vibrating sample magnetometer (VSM) methods. The nanocomposites had a catalytic yolk, a hollow cavity and a porous shell. The nanocomposites had relatively high specific surface area of 203 m 2 g −1 and showed superparamagnetic property. The catalytic activities of the yolk-shell Fe 3 O 4 @MOF-5 nanocomposites were evaluated by using methylene blue dye as a model pollutant. It is demonstrated that the yolk-shell Fe 3 O 4 @MOF-5 nanocomposites as a heterogeneous Fenton-like catalyst exhibited excellent catalysis since the internal cavity provided a relatively stable micro-environment for the reaction of the active ·OH radicals and the pollutants on the basis of the confinement effect. Furthermore, the yolk-shell Fe 3 O 4 @MOF-5 nanocomposites could be lightly separated from the pollutant solution by an external magnetic field and maintained good catalytic activity after five recycles, indicating the good stability of the nanocomposites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yang Han,Zhoujia Liu,Fenfen Zheng,Yixuan Bai,Zhiqian Zhang,Xiaogang Li,Weiwei Xiong,Junhao Zhang,Aihua Yuan
In this study, a novel flower-like Co-TCPP MOF/rGO composite has been successfully synthesized by combining cobalt meso-tetrakis(4-carboxyphenyl) porphyrin (Co-TCPP MOF) and reduced graphene oxide (rGO) via a simple one-pot solvothermal method. The introduction of rGO not only reduces the stacking of MOF effectively, but also facilitates the formation of a continuous conductive network composed of entangled graphene and Co-TCPP MOF in favor of rapid electron transport. More importantly, the ultrathin lamellar structure of Co-TCPP MOF/rGO composite nanosheets could expose more active sites, reduce the diffusion distance of Li + to the internal electroactive sites, and improve the overall electrical conductivity of the electrode due to their sufficient contact with carbon. When evaluated as anode materials for lithium-ion batteries, the flower-like Co-TCPP MOF/(15 wt%)rGO composite electrode delivers a specific capacity of 1050 mAh g −1 at 100 mA g −1 after 100 cycles. A specific capacity of 650 mAh g −1 can be remained after 300 cycles even at 1000 mA g −1 . The superior performance of the Co-TCPP MOF/(15 wt%)rGO composite electrode could be attributed to the introduction of rGO, which prevents the stacking growth of Co-TCPP MOF crystals along the horizontal direction and improves the electrical conductivity.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Wei Shuang,Hui Huang,Ming Liu,Tianyu Bai,Jijie Zhang,Danhong Wang
Copper sulfides are proved to be good candidates as anode materials for sodium ion batteries due to their abundant resources, moderate cost, and relatively high electrical conductivity . However, poor rate performance and cycling life still hinder their development as anode materials for sodium-ion batteries. Herein, we synthesized carbon-coated copper sulfide nanorod assembled into octahedron composites (CuS x @C) by sulfuration of a Cu-based metal-organic framework (Cu-MOF) under different temperatures. These composites with hierarchical structure exhibited superstable cycling performance as anodes of sodium-ion batteries. The CuS x @C sample obtained under 500 °C showed discharge capacity of 208 mA h g - 1 at 2 A g - 1 over 6300 cycles. Porosity and hierarchical stucture facilitate the storage of sodium ion, and carbon-coated structure buffers volume change of anode materials during the electrochemical reaction .
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高影响因子
Applied Materials Today
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2021
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IF 10.041
Minghao Ni,Ming Gong,Xiang Li,Jinlou Gu,Bo Li,Ye Chen
Metal-organic frameworks (MOFs) have attracted significant attention thanks to their excellent physical and chemical properties. Metal-organic frames are widely used in optics. For example, metal-organic frameworks can be used in fluorescent probes to detect and treat diseases, and can also be used to make solid-state light-emitting devices. Considering the high stability and easy synthesis of Zr-based UiO-66 MOF as well as the strong fluorescent emission of porphyrin molecules, the TCPP-incorporated UiO frameworks would inherit these advantages and exhibit intriguing optical performance. Therefore, in this paper, TCPP was doped into UiO-66, and the optical properties of the resulting MOF structure were observed. To obtain the optimal doping condition, three doping concentrations of TCPP were used. Besides the structural and morphological characterization by X-ray diffraction and scanning electron microscopy, more attentions have paid on the optical testing based on absorption and fluorescence spectroscopy, two-photon fluorescence spectroscopy and time-resolved spectroscopy. As a result, the TCPP-doped MOFs exhibited good fluorescence properties and satisfied our previous expectations of nonlinear optical properties and two-photon absorption. This work would pave a new way in constructing various MOFs-based solid-state devices with widespread optical applications.
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高影响因子
JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Li Zhong,Qi Huang,Junyang Ding,Yuanyuan Guo,Xian Wang,Lulu Chai,Ting-Ting Li,Yue Hu,Jinjie Qian,Shaoming Huang
It is of great importance to find non-precious metal based oxygen reduction reaction (ORR) catalysts with high stability, high performance and low cost. In this context, hierarchically porous carbon-based nanomaterials doped with heteroatoms are regarded as one of promising catalysts for ORR. Herein, a bottom-up approach is proposed by using the initial MOF-derived CoO@ZIF-67 core-shell structure as a template to obtain hollow cobalt-anchored N-doped carbon material followed by acid etching ( A-CoNC ). It exhibits a type of hollow porous nitrogen-carbon network anchored by well-dispersed atomic Co-N x sites with high activity and stable catalytic performance. The as-obtained A-CoNC shows high electrocatalytic ORR activity, good reaction selectivity with the low Tafel slope of 55.5 mV dec −1 , large limited current density of 5.37 mA cm −2 and excellent long-term stability (retention = 96.1%, time = 10 h). Furthermore, A-CoNC can also be serving as efficient electrocatalysts for zinc-air battery with a high power density of 144.0 mW cm −2 . Our synthetic strategy from the MOF-derived core-shell structure to ORR electrocatalyst provides new pathway for the design and preparation of highly efficient electro-/photo-catalysts stemmed from MOFs materials.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 5
·7120-7128
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IF 3.741
Menglu He,Jia Jia,Qing Sun,Weixin Zhang
SUMMARY Li-O 2 battery has attracted much attention due to its ultra-high theoretical energy density in the field of electrochemical energy storage. The introduction of efficient electrocatalyst can effectively accelerate the reaction rate of ORR and OER, so as to improve the coulomb efficiency and poor cycle stability of Li-O 2 battery. In this work, a novel hollow N-doped carbon sphere is prepared by using MOF and polystyrene as template, and act as highly efficient oxygen electrocatalyst for rechargeable Li-O 2 batteries. The hollow structure can provide enough oxygen diffusion channel, deposition and decomposition space for reduction products. N doping into the hollow carbon structure can increase the charge density of adjacent carbon atoms and enhance its catalytic activity of ORR/OER. As a result, the Li-O 2 battery using the hollow N-doped carbon sphere as air cathode exhibited an high specific capacity of 18 762 mAh/g (at a current density of 500 mA/g) and remarkable cycling stability of 212 cycles (at a current density of 500 mA/g and limited capacity of 1000 mAh/g), outperforming the carbon material with common structure. This work highlights the importance of air cathode structure and efficient catalyst, provides a new idea for the design of air cathode of Li-O 2 battery, and expands the scope of future research.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Bo Wang,Jiayou Xu,Jixiao Wang,Song Zhao,Xinlei Liu,Zhi Wang
Gas separation performance of mixed matrix membrane heavily depends on the pore structure of the nanofillers. Metal-organic frameworks (MOFs) are promising platform materials for constructing molecular-selective pores for specific applications. In this work, deliberately-selected polymers with CO 2 affinity (PVAm, Pebax and PEI) are employed as pore regulators to manipulate the pore chemistry and size of MOF UiO-66 nanoparticles and consequently control gas transport rate of CO 2 and N 2 molecules. The branched polymer (polyethyleneimine (PEI)) grafted UiO-66, denoted as UKI, is beneficial to enhancing the membrane selectivity. The UKI doped Pebax/mPSf membranes exhibit CO 2 /N 2 selectivity up to 278, 6.5 times of the bare Pebax/mPSf membranes. Meanwhile, the CO 2 permeance is boosted from around 690 to 1120 GPU (1 GPU = 10 −6 cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 = 3.35 × 10 −10 mol m −2 s −1 ·Pa −1 ). The block copolymer (poly(ether block amide) (Pebax)) grafted UiO-66, denoted as UKX, is conducive to increasing the membrane permeance. The UKX doped Pebax/mPSf membranes exhibited CO 2 permeance up to 1683 GPU, 2.45 times of the bare Pebax/mPSf membranes. Meanwhile, CO 2 /N 2 selectivity increased from around 42 to 146. Additionally, excellent pressure-resistant property and outstanding stability are observed under simulated flue gas .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Si-Wen Li,Hai-Yan Zhang,Tian-Hao Han,Wen-Qi Wu,Wei Wang,Jian-She Zhao
A newly kind of spinosus loaded-heteropolyacid catalyst Fe 3 O 4 @MOF-PMoW (abbreviated as FeMP, M = Cr, Cu and Zr) has been obtained under one-pot method using the various magnetic MOF materials bases. Detailed characterizations have proved out the spinosus structure, with the stinging surface morphologies outside, which benefits for the excellent desulfurization performance to the larger contact area with sulfur compounds as much as possible. To be noted, the FeCrP catalyst shows the 100% DBT removal in 60 min, while only 97.0% and 91.6% for FeCuP and FeZrP, respectively. The phenomenon is mainly attributed to the larger BET contact area, leading to link more PMoW to react with DBT in oil. In particular, the FeCrP could be applied in ODS process even after 10 times without the obvious decrease in catalytic activity and the same highly desulfurization performance also has founded in real diesel, showing a better using value in actual industrial application.
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高影响因子
危险品化学品经营许可证（带存储）