COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Bo Liu,Biao Liang,Junjie Xiao,Mengfei Feng,Hui Cheng,Yuan Li,Yi Cheng,Kaifu Zhang
Metal-organic framework (MOF) derivatives exhibit great potential as microwave absorbing materials (MAMs) owing to their high porosity, abundant surface sites and tunable constituents. Herein, this paper proposed an efficient microstructure controllable strategy for synthesizing thin-thickness broadband MAMs named NiFe@C by regulating its material microstructure. NiFe-MOF-74 precursors were firstly prepared through solvothermal method. By controlling the supersaturation of precursors, three kinds of microstructures were obtained: 3-dimensional lotus-like nanorods self-assembled structure, 1-dimensional nanospheres/nanorods hybrid structure, and 0-dimensional nanospheres structure. Subsequently, NiFe@C derivatives were obtained by pyrolysis, inheriting the microstructures of NiFe-MOF-74. The lotus-like structure of NiFe@C achieves an effective absorption bandwidth (reflection loss < -10 dB) of 5.09 GHz (12.91–18.00 GHz) with thickness of only 1.6 mm, while the nanospheres structure of NiFe@C exhibits the maximum absorptance of 99.96% at 17.12 GHz with thickness of 2.3 mm. This work provides a facile direction for designing thin thickness MAMs with broadband microwave absorption capability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Nan Li,Juan Zheng,Lu-Dan Yu,Yuan-Jun Tong,Xinying Gong,Yu Hou,Guosheng Chen,Jianqiao Xu,Fang Zhu,Gangfeng Ouyang
The complex sample matrix and low environmental concentration make it challenging to effectively determine the polar glucocorticoids. In particular, a green, economical, and environmentally friendly method is urgently needed, since a large amount of extraction solvents, samples, and extraction materials have been commonly used to improve the sensitivity of the reported methods. In this study, a green and robust phenol and bismuth-based MOF of SU101 was mildly synthesized and fabricated as a brand new solid-phase microextraction (SPME) fiber. Only tiny amounts of SU101 and desorption solvents were employed to realize the high-efficiency enrichments of glucocorticoids from water samples. The detection performance of proposed SU101 fiber towards glucocorticoids was much superior to the single-component and multi-component commercial fibers. It indicated that SU101 fiber could be an excellent candidate for the enrichments of polar pharmaceuticals. After it was coupled with the instrument of high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS), the linear range of 5–10000 ng L −1 with detection limits low to 0.070–1.5 ng L −1 and satisfactory recoveries were achieved by the developed method. Benefiting from the environmental friendliness of SU101 and the less-solvent consumption of SPME technique, this work presented a green and economical strategy for determinations of trace glucocorticoids.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Dongping Huang,Peng Yong,Shuifa Shen
The sea urchin-like In 2 O 3 material was successfully synthesized through a simple hydrothermal method . Furthermore, the material underwent surface decoration without adding extra indium ions , resulting in the formation of a thin MIL-68(In) layer on the surface of In 2 O 3 . The obtained In 2 O 3 @MIL-68(In) retains the sea urchin-like morphology while acquiring an additional porous structure. Compared to pure In 2 O 3 , the composite exhibits a significant increase in specific surface area, leading to enhanced gas sensitivity. Notably, it demonstrates exceptional sensitivity towards formaldehyde gas, with a response of 18 at 100 ppm at 300 °C, up to six times more than pure In 2 O 3 . Moreover, In 2 O 3 @MIL-68(In) showcases remarkable selectivity and stability. These findings suggest that surface-modified MOF can enhance gas-sensitive properties.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Xiang Zhang,Kai Yao,Xiao Wang,Jinli Wang,Hongtao Guo,Xiaona Ma,Yang Yang,Hongjing Wu,Wei Lu
Hybrid engineering is gradually deemed as a powerful approach to solving the bottleneck problem of metal-organic framework (MOF) derived absorbers for practical application. Herein, a new type of semiconductor/carbon-based hybrid material was successfully prepared by phytic acid (PA) modification and carbonization of MOF/bacterial cellulose (BC) precursors, which remedied the drawbacks of structural instability, lethal byproducts and complicated steps reported previously. Specifically, the obtained Fe(PO 3 ) 2 @C/phosphorus-doped carbon foam (Fe(PO 3 ) 2 @C/PCF) had a 3D hybrid micro-nanostructure that integrated spatial microcurrent network, multi-level pores, heterogeneous interfaces and lattice defects, showing its unique advantages of low filler content (15 wt.%), moderate surface reflectivity, multi-band microwave absorption and radar stealth. The experimental analysis and CST simulation further revealed that PA dosage can precisely adjust the hybrid phase content, pore texture and electromagnetic parameters of the final product to achieve synergistic enhancement of multiple dielectric response, impedance matching and attenuation capacity. As a result, an effective bandwidth (EAB) of 6 GHz and a minimum reflection loss (RL min ) of −57.0 dB were obtained in the Ku- and C-bands, respectively. These encouraging results may advance the development of novel MOF-derived absorbents based on the hybridization principle.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wenxiu Gan,Ziyang Zheng,Jiawei Yan,Xi He,Zanyong Zhuang,Fei-Fei Chen,Yan Yu
Flexible metal–organic framework (MOF) films are greatly desired for the separation of hazardous molecules and ions from wastewater. The current MOF films are usually horizontally deposited on the substrates, and thus restricted by brittleness, low exposure of surface area, as well as poor separation functions. Here, an organic–inorganic mixed substrate is firstly fabricated by growing hydroxyapatite (HA) nanowire arrays on the cellulose fiber (CF). Subsequently, MIL-100(Fe) nanocrystals are assembled on the surfaces of HA nanowire arrays through a layer-by-layer manner, leading to a unique vertical MOF film. The resulting vertical MOF films show competitive advantages over the horizontal counterparts: (i) they show excellent flexibility and they are tolerant to serious physical damage; (ii) they have multiple separation functions including ion exchange of HA, excellent adsorption of MOFs, and strong electrostatic interaction of CF; and (iii) the agglomeration of MIL-100(Fe) nanocrystals is effectively suppressed. Therefore, the average roughness, specific surface area, and average pore size of films are optimized. As a result, the vertical MOF films show universal separation of positively/negatively-charged dyes and Pb 2+ ion, with high removal rates of > 94 %. More appealing, the mixed pollutants in the complex wastewater can be one-step separated through the vertical MOF films, with high removal rates of > 96 %.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Hao-Jing Ding,Ying Zhang,Xi Wang,Qiu-Ying Lin,Shu-Ming Zhang,Mei-Hui Yu,Ze Chang,Xian-He Bu
The construction and modulation of hierarchical pore structure in metal-organic frameworks (MOFs) has become a hot topic owing to the advantages of hierarchical pore MOFs (HP-MOFs) in matter storage and mass transfer related applications. Herein, we report the engineering of crystalline defect in a bimetallic MOF for the construction and tuning of HP-MOF. A microporous MOF system showing metal-center-dependent water stability, namely, {[M3F(bdc)3 tpt] (solvents)}n (M = Zn2+ and Ni2+, H2bdc = 1,4-benzenedicarboxylic acid, tpt = 2,4,6-tris(4-pyridyl)triazine), was utilized as a platform for the construction of HP-MOF. By tuning the Zn2+/Ni2+ ratio in the reactant, a bimetallic MOF with a highly tunable Zn2+/Ni2+ ratio could be obtained. The relatively labile Zn2+-based coordination bonding in the bimetallic MOF could be readily and targeted broken through water treatment for the engineering of crystalline defects-based hierarchical pore structure. The resultant HP-MOF reveals a dramatically increased pore volume with the presence of mesopore and macropore. In addition, the anionic framework of HP-MOF could be utilized for the selective adsorption of a cationic dye methylene blue, and a relatively high capacity (250 mg·g–1, five times compared with the pristine microporous MOF) could be achieved.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wenyan Shi,Xiaolong Han,Fang Bai,Chao Hua,Xingzhong Cao
The metal–organic framework MOF-505 particles were synthesized and incorporated into the polyethylene glycol (PEG) matrix to prepare mixed matrix membranes. A series of methods were used to characterize the structure and morphology of MOF-505 particles and membranes. The prepared MOF-505 had a well-developed pore structure, a large number of metal sites for selective adsorption of thiophene and good compatibility with polymer matrix. Accordingly, the desulfurization performance of the membrane was improved effectively. The effects of the content of MOF-505, operating temperature and feed sulfur content on membrane performance were investigated by pervaporation experiments. The membrane with 3 wt% MOF-505 showed the optimal desulfurization performance with a permeation flux of 2.66 kg/(m 2 ·h) and an enrichment sulfur factor of 8.15, which were increased by 158% and 25% versus pristine membrane, respectively.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mengmeng Zhang,Ximei Hu,Lisha Mei,Li Zhang,Xiao Wang,Xiaochen Liao,Xiuwen Qiao,Chenglin Hong
Conventional electrochemical immunosensors use electroactive materials often suffer from leakage of electroactive materials and signal instability. To solve this problem, this paper proposes an electrochemical immunosensor based on MOF-235 adsorption aggregation signal amplification strategy for the sensitive detection of PSA. Methylene blue (MB) is a cationic dye with redox properties. It has electrochemical reversibility, high electron transfer rate and good biocompatibility. Therefore, it is often used as an electroactive substance in electrochemical immunosensors. However, the non-specificity and poor stability of MB will inevitably distort the diagnostic results and limit its application. In this experiment, MOF-235, a fluffy metal porous MOF material with two carboxyl groups has been prepared and it has a large specific surface area and good biocompatibility. Meanwhile, it can generate electrostatic attraction with the amino groups on MB, and firmly fix methylene blue on the MOF material, which can effectively prevent the signal leaks of MB during the test, and after being adsorbed, the reunion of MB can be controlled, which is conducive to electron transmission thus amplifying the electrical signal. The produced electrochemical immunosensor has good stability and repeatability, and the concentration of the analyte is directly linear with the magnitude of the electrical signal. Under optimum conditions, the proposed immunosensor shows a wide detection range from 10 pg·mL −1 to 1200 pg·mL −1 with a low detection limit of 3 pg·mL −1 .
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Bing Chen,Yanhui Li,Meixiu Li,Mingfei Cui,Wenshuo Xu,Liubo Li,Yaohui Sun,Mingzhen Wang,Yang Zhang,Kewei Chen
By improving the synthesis process of MOF-525, MOF-525 was grown on the surface of graphene oxide (GO), and thus the MOF-525/GO composite was obtained for the adsorption of tetracycline (TC) in water. MOF-525 and GO can be identified on the surface of MOF-525/GO, and the BET surface area measured is up to 444.49 m 2 g −1 . MOF-525 and GO are bonded by coordination bonds, and the lattice structure of MOF-525 is retained in the composite. Both GO and MOF-525 have good adsorption properties, the maximum adsorption capacity is 236.7 mg g −1 and 371.5 mg g −1 , respectively. The maximum adsorption capacity of MOF-525/GO reaches 413.6 mg g −1 , indicating that GO does not weaken the adsorption performance of MOF-525, but further strengthens. The initial adsorption rate of MOF-525/GO for TC was very fast (the adsorption removal rate reached 47% within 2 min), and the adsorption removal amount is almost unchanged after 360 min. Elovich model and Sips model fitted the adsorption process well, revealing that the adsorption process was exothermic reaction dominated by chemisorption and the maximum adsorption capacity was 436 mg g −1 . In addition, MOF-525/GO carries a negative charge, and the adsorption performance gradually decreases with the increase of pH value. The adsorption capacity of MOF-525/GO was mainly derived from π-π stacking and hydrogen bonding , and the complexation between Zr and TC was also involved in the rapid adsorption stage.
✓ 已验证
DOI
高影响因子
Biosensors-Basel
·
2021
·Vol. 11
·期 7
·204
·
IF 5.519
Yanyan Cheng,Ling Liang,Fanggui Ye,Shulin Zhao
Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, theKm(H2O2and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.Keywords:nanozyme;Ce-MOF;haloperoxidase-like activity;ratiometric colorimetric;hydrogen peroxide
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Weixuan Dong,Hongbo Zhou,Baodong Mao,Zhengyuan Zhang,Yashu Liu,Yanhong Liu,Fenghua Li,Dongqi Zhang,Dongxu Zhang,Weidong Shi
The synergistic achievement of low-cost earth-abundant electrocatalysts and high efficiency to meet renewable energy need is highly desirable yet challenging. Here, we developed a simple Ni foam self -templating route for V-doped Ni 3 S 2 nanosheet arrays through in situ formation of metal-organic frameworks (MOFs) combined with subsequent conversion. The as-prepared MOF-V-Ni 3 S 2 /NF catalyst delivers outstanding electrocatalytic performance in the alkaline solution, which requires low overpotentials of 118.1 mV @10 mA cm −2 and 268 mV @10 mA cm −2 for hydrogen evolution reaction and oxygen evolution reaction , respectively. The V-doping and MOF-derived 3D hieratical nanostructure play a vital role in the catalytic process, which provides efficient active sites and large surface areas. Furthermore, an alkaline electrolyzer was assembled with two pieces of MOF-V-Ni 3 S 2 /NF, which achieves efficient water splitting at 1.58 V @10 mA cm −2 . This strategy opens up new channels to synthesize MOF-based bifunctional electrocatalysts toward overall water spitting.
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2020
·Vol. 16
·期 1
·64-71
·
IF 4.056
Tao Zhao,Dong Wang,Chen Cheng,Dazhong Zhong,Genyan Hao,Guang Liu,Jinping Li,Qiang Zhao
Graphical A ZIF@MIL heterostructure was successfully prepared by an in situ solvothermal method. Compared to pure ZIF-67 and MIL-100, the heterostructure possesses a larger electrochemical surface area and exhibits a remarkable catalytic performance with a low overpotential of 232 mV and a small Tafel slope of 57 mV dec −1 at 10 mA cm −2 . Although metal-organic frameworks have proven to be excellent electrocatalytic materials, their application as electrode materials remains limited. The preparation of heterostructures is considered an effective method to improve catalytic activity. Herein, we describe the design and assembly of a dual-MOF heterostructure (CoNi−ZIF-67@Fe−MIL-100, denoted ZIF@MIL). Specifically, we grew a layer of MIL-100 in situ on a bimetallic ZIF-67 surface using a solvothermal method. We demonstrate that the ZIF@MIL has remarkable OER electrocatalytic performance, requiring a low overpotential and showing a small Tafel slope, compared to pure ZIF-67 and MIL-100 in 1.0 m KOH. More importantly, it has excellent operational durability for 50 h at 100 mA cm −2 . The high catalytic activity of ZIF@MIL can be attributed to the heterostructure that can expose more active sites, the synergistic effect between ZIF-67 and MIL-100, and improvement of electron transfer ability. Our work provides a new way to design and prepare dual-MOF crystals with different structures as electrocatalysts.
✓ 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）