MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-9
·
IF 5.7
Sun Mengyao,Zhong Zhihua,Wang Yajie,Yu Bohao,Zhang Lei,Zhang Weibing
A dual-functional lanthanide-MOF nanocomposite probe was designed and constructed for the detection of ascorbic acid (AA). The magnetically functionalized hydroxyapatite nanowires are selected as the carriers and simultaneously loaded with ciprofloxacin (CIP) and terbium metal organic framework to form the internal reference fluorescence probe nanocomposite (Fe 3 O 4 -HAPNWs-Tb/MOF-CIP). This dual-functional lanthanide-MOF probe not only combines the respectively unique fluorescence properties of lanthanide MOFs and CIP, but also takes full advantage of the rapid separation properties of the magnetic component. Structural and spectroscopic characterization results have demonstrated the successful synthesis of probe material and the fluorescence mechanism. At a suitable excitation wavelength (295 nm), the probe can simultaneously emit characteristic fluorescence of CIP (445 nm) and Tb 3+ (543 nm). In the presence of AA, the ratio of I 543 / I 445 decreases rapidly with increasing of AA concentration. The linear range of determination is 0.3–40 μM with a detection limit of 20.4 nM. The contents of AA in vitamin C tablets and four fruit juice samples were detected by the composite probe. The spiked recoveries ranged from 82.6 to 104.2% with relative standard deviations (RSD) less than 2.1%, revealing the practical application value of the developed sensor in healthcare and food fields. Graphical Abstract
A novel internal reference fluorescence sensor (Fe O -HAPNWs-Tb/MOF-CIP) was constructed for detecting ascorbic acid by solvothermal and self-assembly techniques, showing excellent selectivity and sensitivity based on the different responses of Tb/MOF and CIP to the target
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Molecular Catalysis
·
2023
·
IF 4.6
Xiuqin Dong,Chen Xin,Lingtao Wang,Hao Gong,Yifei Chen
Immobilization of the Rh active sites in novel porous materials has attracted attentions for solving the problems of separation and recycling of homogeneous catalysts. In this work, a comparative study of phosphine modified 1Rh/MOF-5 using three different methods was reported, namely 1Rh-P/MOF-5, 1Rh/MOF-5-P and 1Rh/MOF-5-PPh 3 . Similar with the traditional methods, PPh 3 was etched on Rh particles by impregnation in 1Rh-P/MOF-5 and encapsulated in the pores by solvothermal method in 1Rh/MOF-5-P. Moreover, we proposed a novel post-synthesis strategy for grafting phenyl phosphine on the organic linkers in 1Rh/MOF-5-PPh 3. The position of phenyl phosphine in MOFs and the effect of phosphine on the Rh active sites in hydroformylation were investigated by XRD, IR, XPS, TGA and DRIFTS. 1Rh/MOF-5-PPh 3 exhibited the best catalytic activity and stability than 1Rh-P/MOF-5 and 1Rh/MOF-5-P in the hydroformylation of 1-butene. Different P/Rh ratio in P-modified 1Rh/MOF-5 led to the spatial environment change around the Rh active sites. This study showed details in the role of phosphine ligands played in hydroformylation reactions and provided some guidance for MOFs materials in the immobilization of homogeneous catalysts.
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Advanced Science
·
2023
·Vol. 10
·期 9
·2206748
·
IF 15.1
Minghong Wu,Jiaxin Li,Xi Zhang,Shumei Liu,Jianqing Zhao,Weiqi Xie
Dielectric encapsulation materials are promising for solar cell areas, but the unsatisfactory light-management capability and relatively poor dielectric properties restrict their further applications in photovoltaic and microelectronic devices. Herein, an interface fusion strategy to engineer the interface of MOF (UiO-66-NH 2 ) with anhydride terminated imide oligomer (6FDA-TFMB) is designed and a novel MOF cluster (UFT) with enhanced forward scattering and robust porosity is prepared. UFT is applied as an optical and dielectric modifier for bisphenol A epoxy resin (DGEBA), and UFT epoxy composites with high transmittance (>80%), tunable haze (45–58%) and excellent dielectric properties can be prepared at low UFT contents (0.5–1 wt%), which delivers an optimal design for dielectric encapsulation systems with efficient light management in solar cells. Additionally, UFT epoxy composites also show excellent UV blocking, and hydrophobic, thermal and mechanical properties. This work provides a template for the synthesis of covalent bond-mediated nanofillers and for the modulation of haze and dielectric properties of dielectric encapsulation materials for energy systems, semiconductors, microelectronics, and more.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Wenjie Hou,Yan Xing,Claudia Li,Tong Li,Dong Liu,Lusi Ernawati,Jaka Sunarso,Xiuxia Meng
Metal-organic frameworks (MOFs) with intrinsic porosity and high specific surface area have aroused broad interests as a promising electromagnetic (EM) absorbing material. However, the introduction of magnetic components in MOFs has remained as a formidable obstacle for subsequent development. Herein, Fe 3 O 4 /Co-MOF composites were fabricated via a facile and scalable co-precipitation process. The microstructure and morphology of the composites were characterized and the combination of hollow Fe 3 O 4 and Co-MOFs was found to contribute towards the dissipation of incident waves due to the magnetic-dielectric synergistic effect. Impressive microwave absorption ability was obtained with a minimum reflection loss of –56.1 dB over a qualified bandwidth (7.9 GHz) at 2.0 mm. Moreover, the radar cross section simulation further confirmed the effective suppression of radar wave scattering using Fe 3 O 4 /Co-MOF composites. This study provides a versatile strategy for designing magnetic-dielectric composites based on MOFs as effective and broadband microwave absorbers.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhaoshun Liu,Junli Xu,Fang Zhang,Lu Ji,Zhongning Shi
In this work, high-entropy oxide nanoparticles (HEO NPs)/high-entropy metal-organic framework (HE-MOF) heterostructure electrocatalysts for oxygen evolution reaction (OER) are constructed by in-situ growth of HEO NPs on HE-MOF using partial-localized pyrolysis strategy, and the effect of pyrolysis temperature on the OER performance are studied. The results indicate that the well-dispersed HEO NPs are rich in defects such as oxygen vacancy and lattice distortion , which can increase catalytic active centers. Meanwhile, the nanosheet-like HE- MOF not only acts as the support HEO NPs catalyst but also is kinetically beneficial for fast electrons and ions transportation. Among all the prepared nanostructures , HE-MOF-350-200 shows the best OER performance, achieving a low overpotential of 266 mV at 50 mA cm −2 along with a satisfactory stability.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xinlong Zhang,Qingyang Yin,Fuhuai Cao,Yijun Wang,Na Liu,Jing Liu,Rongmei Liu
In this work, we prepared a novel electrode material NiFe-MOF@NiFeTe nanoparticle-rod heterostructures with high capacity and structural stability on nickel foam using a simple two-step hydrothermal method. The prepared NiFe-MOF@NiFeTe heterostructure combines the advantages of MOF and metal telluride with a large specific surface area, high electrical conductivity, and fast redox reaction. Meanwhile, NiFe-MOF@NiFeTe is uniformly distributed on the nickel foam substrate, which avoids agglomeration and facilitates electrolyte transport. The prepared electrode materials have excellent electrochemical properties. At 5 A/g, the specific capacitance of NiFe-MOF@NiFeTe can reach 1245.2 F/g, and the capacitance retention rate can reach 92.3 % after 1000 cycles. Furthermore, the assembled NiFe-MOF@NiFeTe//AC hybrid supercapacitor has an operating voltage of 1.7 V, an energy density of 267.1 Wh kg −1 at a power density of 1699.9 W kg −1 , and a capacitance retention rate of 82.9 % after 5000 cycles at a high current density of 10 A/g. This study provides a feasible strategy for the development of efficient and stable hybrid supercapacitor electrode materials.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Haopeng Jiang,Mengyang Xu,Xiaoxue Zhao,Huiqin Wang,Pengwei Huo
The electron density on the catalyst surface has a great influence on the multi-electron transport process of photocatalytic reduction of CO 2 . In this work, hierarchical Cu 2 O/Ni-MOF composite photocatalyst with local surface plasmon resonance (SPR) properties was prepared by simple hydrothermal and water bath methods. Through DRS, XPS and AES tests found that the SPR of Cu 0 expanded the light absorption , provided hot electrons for the reaction system, and greatly improved the photocatalytic activity in coordination with the hierarchical structure and heterostructure. In the absence of sacrificial agent, the CO yield of 30%-Cu 2 O/Ni-MOF was 4.1 times of Cu 2 O (5.32 μmol/g) and 11.1 times of Ni-MOF (1.95 μmol/g), respectively. Then, the possible photocatalytic reaction path was simply speculated based on in-situ FT-IR. In conclusion, the hierarchical structure, heterostructure and SPR effect accelerate the kinetics of Cu 2 O/Ni-MOF photocatalytic reaction, thus improving its photocatalytic activity.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 15
·2213743
·
IF 19
Jincai Yang,Minman Tong,Guopeng Han,Miao Chang,Tongan Yan,Yunpan Ying,Qingyuan Yang,Dahuan Liu
Considering the small amount of CO 2 as a contaminant in industrial gas mixtures, developing CO 2 -selective adsorbents exhibit advantages in directly obtaining pure C 2 H 2 in one-step to reduce the energy consumption. However, it is still a great challenge due to the essential molecular feature of C 2 H 2 , including the triple bond and high polarizability. Herein, a simple but effective CO 2 -facilitated transport strategy is presented to realize the overwhelming adsorption of CO 2 over C 2 H 2 by constructing core–shell composite structures using ionic liquid (IL) and metal-organic framework (MOF). With the aid of excellent solubility of CO 2 in IL and almost total exclusion of C 2 H 2 , the obtained materials boost molecular sieving-based separation of CO 2 /C 2 H 2 . Density functional theory calculations combining molecular dynamic simulations revealed the solution-diffusion mechanism for CO 2 , which is rarely reported in solid adsorbents. Ideal adsorbed solution theory selectivity for CO 2 /C 2 H 2 with 1/1 and 1/3 volume ratios can reach over 10 4 and 4000 at 100 kPa with a high CO 2 uptake of 40.3 cm 3 g −1 , superior to those of the reported materials so far. More importantly, this solution-based separation strategy can avoid the difficulty for precise control of the regulation of adsorbent structure, which may be beneficial to practical production.
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AICHE JOURNAL
·
2022
·Vol. 69
·期 2
·e17973
·
IF 4.167
Hong Xu,Di Hu,Lu Lin,Man Zhang,Xin Li,Yongjian Zeng,Mahmoud Amer,Wenhao Luo,Kai Yan
The selective hydrogenation of biomass-derived levulinic acid (LA) to γ-valerolactone (GVL) is one of pivotal reactions in many of the biorefinery schemes for the production of value-added chemicals and biofuels. Herein, we have fabricated carbon-supported bimetallic NiCo catalysts based on the metal–organic framework (MOF) material via a pyrolysis method. The as-obtained Ni 1 Co 1 bimetallic catalyst outperforms monometallic counterparts in the catalytic performance of LA-to-GVL, with a nearly full conversion of LA and a GVL yield of 95.2%, in particular with an excellent catalyst stability up to seven consecutive runs at 160°C and 4 MPa H 2 . Based on a combined characterization study by employing advanced techniques, for example, extended x-ray absorption fine structure (EXAFS), high-angle annular dark-field scanning transmission electron microscopy (HADDF-STEM), and electron paramagnetic resonance (EPR), we reveal that the enhanced catalytic performance, in particular the excellent stability, could be attributed to the formation of the bimetallic alloys, which efficiently alleviates the metal leaching and sintering during catalysis.
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SOLAR ENERGY
·
2023
·
IF 6.7
Dandan Yan,Min Li
The utilization, conversion and storage of clean solar energy serving composite phase change materials (PCMs) formed through combination of shape-stable PCMs and light-absorbing materials becomes one of the most efficacious measures to accomplish sustainable development. In this article, the metal–organic framework (MOF) was functionally modified with stearic acid (SA) by in-situ hydrothermal method for the first time and the prepared SA-modified HKUST-1 (HS) was served as the support material for SA. The morphology and crystal structure of HS displayed unobvious change, while significantly increased the surface and formed a relatively strong hydrogen bond with SA. Therefore, the SA adsorption rate of HS reached as high as 60 wt% without any leakage, which was 20 wt% higher than HKUST-1. TaON and SiW 12 were collaboratively employed as light-harvesting materials innovatively, and all PCM composites were fabricated through the simple solution immersion means. It is exciting that the SA/HS/TaON/SiW 12 composite PCMs not only exhibited good shape-stability, high latent heat (126.4 J/g) as well as heightened thermal conductivity (grown by 295.9% than SA), but also displayed the outstanding thermal reliability and remarkable solar-thermal energy conversion capability (efficiency reached 96.6%). This work expanded a new orientation of photothermal materials used for utilization of solar energy especially in the application of solar water heater systems.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 42
·15447-15455
·
IF 4
Xianliang Li,Diwei Deng,Lufang He,Yan Xu
Exploration of credible non-enzymatic glucose sensors with high selectivity and sensitivity is of great significance for early clinical monitoring of glucose concentration and preventing the threat of diabetes to human health. Here, mesoporous carbon (MC) sphere immobilized Co-MOF-74 nanorods (NRs), denoted as Co-MOF-74 NRs/MC, were successfully prepared, in which the nanostructural porous carbon sphere was obtained using cobalt glycolate as the built-in template followed by a subsequent carbonization and acid treatment, and the MC spheres were then in situ deposited on the surface of Co-MOF-74 NRs via a solvothermal method. Benefiting from the good conductivity of the grafted porous carbon spheres and the abundant active sites, as well as the permeability of microporous MOF-74 nanocrystals, the Co-MOF-74 NRs/MC modified glassy carbon electrode (GCE) exhibited effective non-enzymatic glucose sensing performance with a fast response time (less than 3 s) and a glucose sensitivity of 98.0 μA cm−2 mM−1. Furthermore, the Co-MOF-74 NRs/MC/GCE showed a favourable anti-interference capability in the presence of various interferents and good long-term reusability. The applicability of Co-MOF-74 NRs/MC/GCE for glucose sensing in real serum samples was also investigated, verifying the applicability of the electrode for targeted glucose monitoring in practical applications.
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Nanomaterials
·
2023
·Vol. 13
·期 17
·2416
·
IF 5.3
Jun Chen,Yuanjiang Yang,Sheng Yu,Yi Zhang,Jiwei Hou,Nengfei Yu,Baizeng Fang
Nanocomposites that combine porous materials and a continuous conductive skeleton as a sulfur host can improve the performance of lithium–sulfur (Li-S) batteries. Herein, carbon nanotubes (CNTs) anchoring small-size (~40 nm) N-doped porous carbon polyhedrons (S-NCPs/CNTs) are designed and synthesized via annealing the precursor of zeolitic imidazolate framework-8 grown in situ on CNTs (ZIF-8/CNTs). In the nanocomposite, the S-NCPs serve as an efficient host for immobilizing polysulfides through physical adsorption and chemical bonding, while the interleaved CNT networks offer an efficient charge transport environment. Moreover, the S-NCP/CNT composite with great features of a large specific surface area, high pore volume, and short electronic/ion diffusion depth not only demonstrates a high trapping capacity for soluble lithium polysulfides but also offers an efficient charge/mass transport environment, and an effective buffering of volume changes during charge and discharge. As a result, the Li-S batteries based on a S/S-NCP/CNT cathode deliver a high initial capacity of 1213.8 mAh g−1at a current rate of 0.2 C and a substantial capacity of 1114.2 mAh g−1after 100 cycles, corresponding to a high-capacity retention of 91.7%. This approach provides a practical research direction for the design of MOF-derived carbon materials in the application of high-performance Li–S batteries.Keywords:lithium–sulfur batteries;carbon nanotubes;metal–organic framework;shuttling effect;chemical immobilization
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