INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Junjie Zhu,Linbo Wu,Zhiyang Bu,Suyun Jie,Bo-Geng Li
Searching for highly efficient and robust CO2 adsorbents is very important for CO2 capture, utilization, and storage. In this study, new polyethylenimine-grafted metal–organic framework (MOF)–polymer composites, abbreviated as PEI@PGD-H, were synthesized via high internal phase emulsion (HIPE) template polymerization of divinylbenzene and glycidyl methacrylate, followed by in situ generation of HKUST-type MOF in the presence of hydrophobic-modified CuO nanoparticles via the reaction of CuO with 1,3,5-benzenetricarboxylic acid and then polyethylenimine (PEI) functionalization via epoxy–amine reaction and amine–metal sites interaction. The coexistence of the hierarchical interconnected porous skeleton of poly(glycidyl methacrylate–divinylbenzene) (PGD), high specific surface area of MOF, and chemical CO2 adsorption of PEI endows PEI@PGD-H with high CO2 adsorption capacity, rate, and selectivity. PEI70@PGD-H shows a CO2/N2 separation factor as high as 76 and CO2 adsorption capacities of 4.3, 3.0, and 1.8 mmol of CO2/g from pure CO2, simulated flue gas, and air, respectively. After 20 CO2 adsorption–desorption cycles, the adsorbent still retained a high and stable CO2 capture capacity over 2.8 mmol of CO2/g for simulated flue gas. The adsorbent also displays reasonably good thermal stability, excellent water endurance, low desorption energy, and easy shaping. The desorption heat is as low as 48 kJ/mol of CO2. These features make PEI@PGD-H highly efficient, robust, and low-energy CO2 adsorbents for practical application in CO2 capture.
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高影响因子
CATALYSIS TODAY
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2019
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IF 4.888
Le Yang,Rui Ma,Hui Zeng,Zebao Rui,Yongdan Li
This work provides a facile strategy to prepare core-shell structured catalysts with MOF-templated metal active species embedded carbon matrix core and a functional metal oxide shell in a controllable way. The procedure features with the facile introduction of functional shell metal oxide and delivery of MOF morphology. Co(II/Ⅲ)@ZnO hexagonal prisms are fabricated with this procedure and ZIF-67 as the template. When being used in the selective oxidation of vanillyl alcohol to produce vanillin, ZnO shell plays an important role by faciliating redox of Co 3+ /Co 2+ for promoting vanillyl alcohol oxidation to vanillin and protecting the Co species against leaching into the reaction system. Co(II/Ⅲ)@ZnO exhibits a conversion of 20% with a selectivity of 80% after a 2 h reaction and shows stability after 3 catalytic cycles.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2715-2721
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IF 4.052
Lin Lin,Siyu Huang,Yuxin Zhu,Biao Du,Zhihua Zhang,Chao Chen,Xuewen Wang,Ning Zhang
A new synthetic method was used to develop a CdS/MoS2 heterojunction. Cd-MOF was coated onto the surface of MoS2 flowers to construct a core–shell MoS2@Cd-MOF. Thioacetamide was used as a sulfur source to sulfurize the MoS2@Cd-MOF to form a CdS/MoS2 heterojunction. Since the Cd2+ ions were highly ordered and separated by the organic ligands of the Cd-MOF shell, the as-synthesized CdS/MoS2 heterojunction possessed a large surface area and intimate contact at the heterogeneous interface with a uniform loading of CdS nanoparticles on the MoS2 flowers. Consequently, the CdS/MoS2 heterojunction exhibited a significantly enhanced photocatalytic H2 evolution rate of average 5587 μmol h−1 g−1 under UV-visible light irradiation.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Shumin Wang,Qingping Guo,Shujun Liang,Peng Li,Jujie Luo
A series of mixed matrix membranes (MMMs) were fabricated with Ni-MOF-74 as filler and poly (styrene-b-butadiene-b-styrene) (SBS) polymer as matrix materials for CH 4 /N 2 separation. MMMs were characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Gas separation behavior was investigated by measuring single and mixed gases. For the single gas, the CH 4 permeability of the MMMs incorporated with 15 wt% Ni-MOF-74 (Ni-MOF-74/SBS-15) reached 83.5 Barrer, which was 116% higher than that of SBS (38.6 Barrer), while its ideal selectivity remained the same. CH 4 permeability can further increase to 176.6 Barrer with the increase in temperature to 55 °C. For the CH 4 /N 2 (50/50 vol%) mixed gas, the Ni-MOF-74/SBS-15 sample exhibited increasing CH 4 permeability (74.7 vs 36.7 Barrer), while selectivity remained unchanged relative to that of the pure SBS membrane.
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CATALYSIS COMMUNICATIONS
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2018
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IF 3.463
Xilei Lu,Lixin Wang,Xiuyang Lu
Metal organic frameworks (MOFs) are promising heterogeneous catalysts for biomass conversion to useful chemicals. In this work, four M-MOF-74s (Co, Ni, Mg, Zn) were synthesized at room temperature. Among these, Mg-MOF-74 exhibited the best catalytic activity for conversion of sugars to methyl lactate. A final product yield of methyl lactate from glucose of 35% was achieved with complete conversion of glucose at optimal reaction conditions. Catalytic performance of conversion of five sugars to methyl lactate over Mg-MOF-74 was studied, a product yield of 47% were obtained from sucrose. Mg-MOF-74 catalyst has shown to be reusable for at least three cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yuanyuan Fu,Yanfei Li,Rihui Zhou,Yuzhe Zhang,Shouhui Chen,Yonghai Song,Li Wang
A new route to load Co 3 O 4 nanoparticles (NPs) on MOF-5 (MOF-5 was composed of 1,4-benzenedicarboxylate (BDC) and Zn 2+ via coordination bond (Zn 4 O(BDC) 3 ·(DMF) 8 (C 6 H 5 Cl)), where MOF indicates metal-organic framework) derived hierarchically porous carbon (MDPC) was proposed. Various techniques including scanning electron microscopy, transmission electron microscopy , Raman spectroscopy , powder X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis and electrochemical methods were used to characterize the Co 3 O 4 NPs@MDPC. The results showed that the MDPC contained mesopores obtained by vaporizing ZnONPs and micropores came from MOF-5 self. Lots of nano-sized Co 3 O 4 NPs formed in MDPC's mesopores. The vast micropores of MDPC provided an effective channel for the transport of Li + when it was used as anode materials for lithium ion batteries (LIBs). The MDPC prevented Co 3 O 4 NPs from agglomerating effectively, which remained robust for superior rate capability during repeated lithiation/delithiation process. And the as-prepared Co 3 O 4 NPs@MDPC composites remained 94% reversible capacity from the second cycle. Furthermore, the as-prepared Co 3 O 4 NPs@MDPC anode manifested outstanding capability of 587.2 mA h g -1 at 2000 mA g −1 after 200 cycles, apparently superior to that of other Co 3 O 4 NPs@PC. The high capacity especially at high current density and exceptional rate capability of Co 3 O 4 NPs@MDPC manifested it is a promising anode material for LIBs.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9228-9235
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IF 9.931
Teng Wang,Rumei Jin,Xiuqi Wu,Jie Zheng,Xingguo Li,Kostya Ostrikov
A highly efficient Ni–Mo bimetallic catalyst for the hydrogen evolution reaction can be obtained from a molybdate incorporated Ni-MOF by thermal decomposition in NH3. The catalyst is composed of crystalline Ni nanoparticles doped with amorphous low valence Mo oxide encapsulated in thin N-doped carbon layers, showing excellent HER performance, featuring a very low overpotential for the HER (η20 = 58 mV), low Tafel slope (57 mV dec−1) and excellent long term stability. The catalyst apparently outperforms N-doped carbon encapsulated Ni catalysts without Mo doping, emphasizing the critical synergetic effect of Mo doping and the surface N-doped carbon thin layer on promoting the performance of Ni based HER catalysts.
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ENERGY
·
2018
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IF 4.968
Jie-Cheng Li,Xiao-Tong Wu,Li-Jun Chen,Nan Li,Zhao-Qing Liu
High cost and vulnerable stability of noble metal catalysts are the main barriers to develop the sustainable clean energy conversion and storage technology. In this work, a novel Co species/N-doped carbon (Co-N-C) derived from ZIF-67 has been designed and successfully prepared by a simple and feasible process. The ORR activities of the obtained Co-N-C with different contents of cobalt species were systematically investigated and clearly elucidated. Notably, the Co-N-C cathode exhibits a high onset-potential −0.12 V (vs. SCE) and long-tern stability in alkaline situation. Furthermore, the self-assembled Zn-air battery and microbial fuel cells (MFCs) devices coupled with Co-N-C cathode also achieve superior open-circuit potentials (Zn-air: 1.40 V, MFC: 0.45 V) and high power densities (Zn-air: 102.3 mW m −2 , MFC: 399.7 ± 10 mW m −2 ).
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高影响因子
ACS Catalysis
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2018
·
IF 11.384
Yan Long,Shuyan Song,Jian Li,Lanlan Wu,Qishun Wang,Yu Liu,Rongchao Jin,Hongjie Zhang
Designing metal–organic framework (MOF)-encapsulated hybrid catalysts is considered as an effective way to realize catalytic selectivity because of advantages related to the unique channels of MOF. Here, a sodium polystyrenesulfonate (PSS)-induced, microwave-assisted route was developed to controllably construct Pt/CeO2@MOF core@shell hybrids. Using PSS as a modifying agent and followed by microwave assistance, MOFs could be continuously grown in an oriented manner on Pt/CeO2 nanospheres. The obtained Pt-CeO2@UIO-66-NH2 exhibited high conversion (99.3%) with high selectivity (>99%) for selective hydrogenation of furfural to furfuryl alcohol. It showed that the CeO2 would promote the catalytic activity, whereas the size confinement effect of the UIO-66-NH2 channels can enhance the catalytic selectivity. This work highlights a useful strategy toward the universal synthesis of highly active, stable, and selective catalysts for further utilization.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Tinghai Yang,Rengui Xiao,Fenglian Lu,Xiang Ke,Mengxia Wang,Keliang Wang
Metal–organic frameworks (MOFs) are considered highly promising anode materials for lithium-ion batteries (LIBs) due to their unique physical and chemical properties. However, the low electrical conductivity of single-metal MOF materials limits their application in LIBs. To overcome this challenge, this work designed and synthesized a bimetallic NiCo-MOF material with a hollow spherical structure. Through a combination of theoretical and experimental methods, we explored the differences in conductive mechanisms between Ni-MOF and NiCo-MOF, as well as their electrochemical performance as anode materials for lithium-ion batteries. Specifically, the average electrical conductivity of NiCo-MOF is 0.058 mS cm−1, which is 34 times that of Ni-MOF (0.0017 mS cm−1). Density functional theory (DFT) calculations indicate that the increase in conductivity is due to the introduction of Co2+, which increases the electron transport pathways and significantly boosts carrier concentration. Compared to Ni-MOF, NiCo-MOF has 19 additional electrons at the Fermi level. This enhanced conductivity also results in a more significant electrochemical performance; under 2C conditions, NiCo-MOF maintains a specific capacity of 696.3 mA h g−1 after 200 cycles, which is twice that of Ni-MOF (299.9 mA h g−1). This work provides a potential strategy for improving the conductivity of MOF materials and their application in lithium-ion batteries.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 9
·4184-4190
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IF 2.7
Jie Ding,Xue-Qin Liu,Lei Wang,Ying-Bo Zhu
Reducing the dissolution of metal nanocatalysts to preserve active catalytic sites for peroxymonosulfate-activated advanced oxidation processes (AOPs) is crucial for advanced wastewater treatment. On this basis, a well-defined hollow cage structure (H-CoS/NC)/nanoreactor was successfully constructed by the in situ assembly etching technique to promote the degradation of organic pollutants. The as-obtained catalysts played a significant role in reducing the dissolution of metal catalysts (0.46–0.65 mg L−1) and phenol (50 mg L−1) degradation achieved 100% within 30 min. The unique hollow structure allowed for higher instantaneous concentrations of organic pollutants in the microenvironment, thus providing the impetus for higher reaction rates. The mutual support and mesoporous adsorption of carbon shells allowed most of the CoS particles to be confined in the carbon framework without releasing them into the bulk solution, which improved the stability and reduced the dissolution of metal catalysts. In addition, the cavities between the hollow structures reduce the mass diffusion resistance making the enriched reactant molecules easier to contact with the active sites, which increases the contact of the reactants with the active sites, and realizes the ultra-fast pollutant degradation. This provides an effective way to reduce the dissolution of cobalt-based catalysts and retain active sites in AOPs, balancing the contradiction between the reactivity and stability of nanocatalysts.
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FOOD CHEMISTRY
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2024
·
IF 8.5
Liling Wang,Yanbin Wang,Yifeng Zhou
Bimetallic MOF derivatives have shown excellent performance as nano-enzymes in the field of catalysis. Herein, PdCo oxide nanoflowers with three-dimensional flower were prepared by a simple pyrolysis method on a precursor of bimetallic PdCo-MOF. PdCoO x showed excellent peroxidase mimic activity, which could significantly promote the oxidation of TMB by H 2 O 2 . Compared with CoO x , the peroxidase mimic activity of the optimized PdCoO x -300 increased by 2.41-fold. PdCoO x -300 has high affinity for TMB and H 2 O 2 with K m values of 0.16 mM and 2.11 mM, which are only 57.03% and 36.87% of HRP, respectively. The highly specific peroxidase mimic activity is conducive to the sensitive detection of H 2 O 2 , glucose and ascorbic acid with limit of detection of 10, 100 and 10 nM, respectively. Furthermore, the total antioxidant capacity in the actual beverage samples was conducted, which showed good anti-interference ability and recovery rate.
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PubMed
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