CERAMICS INTERNATIONAL
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2022
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IF 5.532
Minghao Shi,Nan Li,Shixiang Zuo,Guifang Sun,Wenjing Shen,Mianmian Wu,Qingfei Li,Jiangquan Ma
The development of the hydrogen industry from electrolytic water is confined in great measure to the slow kinetics of oxygen evolution reaction (OER), which means the rational design of a stabilized and efficient OER electrode is the key. The construction of easily accessible hydroxide ion (OH − ) adsorption sites can effectively accelerate the kinetics of the OER. Herein, the NiS/CoNC electrocatalysts , which can effectively adsorb OH − and exhibited excellent OER performance in an alkaline environment, were obtained by pyrolysis and sulfidation of NiCo-MOF nanosheets on nickel foam (NF). In particular, the optimized NiS/CoNC electrocatalyst achieved an overpotential of 46/106 mV at 10/100 mA cm −2 and Tafel slope of 57.41 mV dec −1 , which is superior to most reported materials. The outstanding function of OER results from the NiOOH/CoOOH active component generated by surface reconstruction after activation of the NiS/CoNC catalyst and the excellent charge transfer capability of the NiS component. This work offers a scheme to construct the electrocatalysts derived from MOF with excellent OER performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Chenwei Xu,Zheng Wang,Chi Chen,Fengfeng Kuang
Porous octahedral copper-based metal organic framework MOF-199 anchored with Ru, RuMo, RuP, and RuMoP nanoparticles (NPs) was fabricated by a simple liquid impregnation method and applied as a high-performance catalyst for the hydrolysis of ammonia borane (AB) at room temperature . Comparison of the catalytic activities of Ru@MOF-199, RuMo@MOF-199, RuP@MOF-199, and commercial Ru/C shows that RuMoP@MOF-199 owns a very high turnover frequency of 735.6 mol H 2 min −1 (mol Ru) −1 and a low activation energy of 46.9 kJ/mol. Loading RuMoP NPs onto MOF-199 owing to synergistic effects , functional, size, and support effects kinetically facilitates the oxidative cleavage of attacked H- OH and elevate the catalytic performance. Moreover, this catalyst shows satisfied durability after five cycles for the hydrolytic dehydrogenation of AB. The novel structural features and efficient performance would provide an essential reference for the utilization of high-performance catalyst development.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ke Zhang,Yajing Wei,Hongyang Cao,Yue Xin,Chuanyi Wang
Tuning reactive oxygen species in peroxymonosulfate (PMS) activation by the structure of catalysts has been extensively studied. But in photocatalysis , the photothermal effect is lack of attention on the alteration of reactive species produced by PMS activation. In this work, ZnFe 2 O 4 /C photocatalyst with oxygen vacancy (ZFO v /C) was synthesized via the calcination of bimetallic Zn/Fe-metal–organic framework. The photocatalytic performance of the catalyst had been studied under several conditions, and the experimental results demonstrated that the photocatalytic reaction rate constant of ZFO v /C photocatalyst without temperature control was 21.3 % higher than that under temperature control. Reactive species quenching experiments and electron paramagnetic resonance indicated that 1 O 2 and h + are the primary reactive species without temperature control, while only 1 O 2 are the dominant reactive species under temperature control conditions. The possible activation site was speculated by in-situ Raman spectroscopy , XPS spectra and cycling experiment. This paper analyzes the reasons for photocatalysis to improve the degradation rate of pollutant from the perspective of the change of reactive species generated by photothermal effect on PMS activation, which may open up opportunities to explore the maximum utilization of sunlight in PMS activation.
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FUEL
·
2022
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IF 8.035
Na Geng,Fei Wang,Di He,Fang Wang,Futing Xia,Jiayu Feng,Lijuan Jia,Lidong Wang,Ping Ning
In the wet magnesia desulfurization process, magnesium sulfite oxidation is essential to reclaim and resource utilization the byproducts. Therefore, it is of great significance to create reliable and effective catalysts. In this study, a novel and efficient catalyst, Co-MOF (BTC), was synthesized by an ultrasound assisted one-pot method. The oxidation rate of MgSO 3 by Co-MOF (BTC) was 0.112 mmol·L −1 ·s −1 , 13–14 times higher than under non-catalytic conditions, with an apparent activation energy of 26.82 kJ·moL −1 . The catalytic efficiency is 4–5 times higher than previously reported Co-SBA-15 catalysts with the same loading. The characterization results of XRD, TEM and XPS confirm that the active component cobalt has a high dispersion on TMLA, and Co (II) plays an important role in improving the oxidation performance of catalysts. The results reveal that the rich hydroxyl group on surface of TMLA is conducive to the dispersion of Co for full contact with the reactants, and the Co (II) of Co-MOF (BTC) is favorable to the formation of Co-O bond, and then promotes its oxidative activity. The kinetics of the MgSO 3 oxidation catalyzed by the prepared Co-MOF (BTC) was investigated in a bubble oxidation apparatus, indicating that the oxidation rate was dependent on the reaction temperature, pH value, oxygen partial pressure and air velocity.
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MATERIALS CHEMISTRY AND PHYSICS
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2022
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IF 4.778
Haotian Guo,Xinhuan Lu,Jie He,Huaxin Zhang,Haifu Zhang,Yanhong Dong,Dan Zhou,Qinghua Xia
A composite material ZSM-5@Co-MOF containing Co-MOF and ZSM-5 was successfully prepared by steam-assisted crystallization of Co-MOF on the zeolite surface. Compared to physically mixing Co-MOF on the zeolite surfaces, Co-MOF nanosheets were uniformly attached to external surfaces of the ZSM-5 crystals because of the enhanced interaction between zeolite and Co-MOF in the composite. In addition, the Co-MOF was distributed as a nanosheet structure, and its dispersibility was greatly enhanced, in which this behavior led to more uniform distribution of the deposited active sites. Interestingly, the designed composite exhibited an excellent catalytic performance for the epoxidation of α-pinene with air. Compared to isolated Co-MOF and ZSM-5, high yield of the product (94.4%) was obtained over the 0.5ZSM-5@Co-MOF-150 composite due to the highly dispersed Co-MOF nanosheet. This opens up interesting prospects for developing new zeolite@MOF composite catalysts as efficient heterogeneous catalysts.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2022
·Vol. 102
·期 14
·6387-6396
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IF 4.125
Xiaodan Pan,Shahid Ahmed Junejo,Chin Ping Tan,Bin Zhang,Xiong Fu,Qiang Huang
BACKGROUND Thymol is a natural essential oil with strong volatility, low solubility, poor dispersion, strong irritation, and an unpleasant smell, which often requires appropriate porous materials to encapsulate thymol during the application process. However, the encapsulation efficiency of thymol in inclusion complexes is low, and new methods of encapsulation need to be developed. In the present study, the encapsulation capacity, storage stability, and antibacterial activity of thymol were investigated using γ-cyclodextrin (γ-CD) metal–organic frameworks (MOFs) by cocrystallization and high-temperature adsorption methods. The effect of different potassium salts (i.e. KOH, KCl, and KAc) on the structure and complexation of γ-CD-MOFs was also analyzed. RESULTS Compared with γ-CD, the thymol encapsulation capacity of γ-CD-MOFs was increased by two- to three-fold, with the encapsulation content following the order: KAc-γ-CD-MOF (293.8 mg g –1 ) > KOH-γ-CD-MOF (287.7 mg g –1 ) > KCl-γ-CD-MOF (249.3 mg g –1 ). The anions in the solution participate in the coordination and influence the symmetry relationship between atoms and ions. This explains the differences in both the three-dimensional γ-CD-MOF structure and the thymol encapsulation amount, as well as the high storage stability of thymol. CONCLUSION The in vitro release kinetics and antibacterial experiments showed that the inclusion complexes prepared by γ-CD-MOFs had higher stability, sustainability, and antibacterial activity, which suggests that it is an excellent complex material for industrial and agricultural applications. © 2022 Society of Chemical Industry.
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PubMed
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Nanoscale
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2022
·Vol. 14
·期 19
·7322-7331
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IF 8.307
Si-Qi Zhu,Jin-Cheng Shu,Mao-Sheng Cao
The upcoming 5G era will powerfully promote the development of intelligent society in the future, but it will also bring serious electromagnetic pollution. Thus, the development of efficient, lightweight and multifunctional electromagnetic shielding materials and devices is an important research hotspot around the world. Herein, a novel needlelike Co3O4/C array architecture is constructed from MOF precursor via a simple pyrolysis process, and its microstructure is controllably tailored by changing the pyrolysis temperature. The unique 3D hierarchical structure and multiphase components enable the architecture to provide high-efficiency electromagnetic interference (EMI) shielding, along with good thermal insulation. More importantly, the architecture possesses fast ion transport channels, which can be used to construct supercapacitors with high specific capacitance and excellent cycle stability. Obviously, this work offers a new inspiration for the design and construction of multifunctional electromagnetic materials and devices.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Baoyin Li,Xinda You,Hong Wu,Runlai Li,Ke Xiao,Yanxiong Ren,Hongjian Wang,Shuqing Song,Yuhan Wang,Yunchuan Pu,Xiaochun Huang,Zhongyi Jiang
Fabricating metal-organic framework (MOF) membranes on processable and flexible polymeric substrates is of great significance for potential practical application, but remains technically challenging due to the lack of nucleation sites on polymeric substrates. Here, we report an efficient and facile method to render abundant and uniform nucleation sites on the substrate surface by pre-anchoring metal ions through coordination-driven self-assembly of metal-organophosphate. The coordination between the multidentate phytic acid (PA) and the metal ions enables the functionalization of polymeric substrates with a metal-phytic acid layer, which anchors metal ions to promote the subsequent generation of thin and defect-free MOF layers thereon. As an illustration, the ZIF-8 membrane was synthesized on Zn 2+ -PA functionalized polyacrylonitrile substrate and optimized by regulating the pre-anchored Zn 2+ content. The obtained ZIF-8 membrane exhibited a superior separation performance for C 3 H 6 /C 3 H 8 mixture, harvesting selectivity up to 150 with C 3 H 6 permeance of 70 GPU. Besides, the polycrystalline ZIF-8 membrane also displays excellent bending and pressure resistance due to the strong combination between the MOF layer and the polymeric substrates from the fortified and robust bridging coordination effect of the metal-organophosphate layer. Our strategy can be extended to diverse MOFs and polymeric substrates, paving a facile and generic way to fabricate MOF membranes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Ze Qin,Hao Li,Xianfeng Yang,Liyu Chen,Yingwei Li,Kui Shen
The fixation of CO 2 with epoxides is a promising strategy to reduce CO 2 emission. However, homogeneous halogen-based cocatalysts are often requisite for most heterogeneous catalysts to obtain desired activities, which significantly complicates the subsequent product purification/separation. Herein, we report the heterogenization of homogeneous Br-based cocatalysts by encapsulating them into stable and recyclable ZIF-8-based hollow nanoreactors (ZIF-8-HS) for efficient CO 2 fixation. The synthesis involves in epitaxial growth of a size-controlled ZIF-8 layer on hollow ZIF-67 spheres prepared by using Br-contained surfactants as templates, followed by etching the unstable ZIF-67 shell. In ZIF-8-HS, the Br-contained surfactants can serve as efficient cocatalysts to activate substrates, while the microporous ZIF-8 shell possesses abundant intrinsic active sites and offers the cocatalysts a confined homogeneous environment. Impressively, ZIF-8-HS shows high activity, good size-selectivity and excellent recyclability for the CO 2 fixation with epoxides, fully exploiting the respective advantages of homogeneous CTAB and heterogeneous ZIF-8 for this reaction.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zhenfeng Li,Jianyang Wu,Pingping Chen,Qinghui Zeng,Xin Wen,Wen Wen,Yu Liu,Anqi Chen,Jiazhu Guan,Xu Liu,Wei Liu,Henghui Zhou,Liaoyun Zhang
To improve the polysulfides redox conversion and mitigate the shuttle effect for lithium-sulfur (Li-S) batteries, a hyperbranched polymer coated MOF-derived zirconium nitrogen oxides and N -doping carbon composites (Zr 2 N 2 O/NC-6) are designed and prepared by pyrolytic method. Thanks to some advantages of this type of new composites including fast lithium-ion transport, lithium polysulfides (LiPSs) anchoring and multiple functional sites, the cells with S/Zr 2 N 2 O/NC-6 cathode exhibit good cycle stability (the capacity retention is 81.8% at 1C after 300 cycles) and rate capability (566.8 mAh g −1 at 5C). More importantly, even if the sulfur loading is up to 8.16 mg cm −2 and low electrolyte/sulfur (E/S) ratio (7.79 µL mg −1 ), the cells with S/Zr 2 N 2 O/NC-6 cathode deliver an initial area capacity of 7.2 mAh cm −2 and the capacity also can maintain at 5.34 mAh cm −2 after 80 cycles at 0.2C, which are much better than the commercial lithium-ion batteries. This work exhibits a MOF-derived novel material Zr 2 N 2 O/NC used as the sulfur host for the first time, which can have a guiding role in designing multifunctional materials with adsorption, ion transport and catalytic features for the high-performance lithium sulfur batteries with application potential.
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Nano Energy
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2022
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IF 19.069
Yi Lu,Deqi Fan,Ziyi Shen,Hao Zhang,Haolan Xu,Xiaofei Yang
Interfacial solar evaporation technology is recognized as one of the most promising strategies to address freshwater scarcity issues. To realize the sustainability of this technology for producing potable water from seawater and contaminated water sources, multi-functional photothermal materials need to be explored to attain higher vapor output at the same solar energy input. Herein, a novel wood-based solar evaporator composed of porous wood substrate, zeolitic imidazolate framework-8 (ZIF-8), and polydopamine (PDA) as a light absorption layer is developed. The in-situ loading of ZIF-8 in the microchannels renders the wood evaporator an important function of reducing the equivalent evaporation enthalpy due to the lowered hydrogen bonding density of water molecules when they pass the wood channels, substantially augmenting solar evaporation efficiency. A superior evaporation rate of 2.70 kg m −2 h −1 is achieved under 1.0 sun irradiation, which exceeds the theoretical limit of a typical 2D photothermal evaporator (~1.46 kg m −2 h −1 ). The designed wood/ZIF-8@PDA also exhibits a prominent removal efficiency for harmful ions and organic pollutants. This multifunctional wood-based solar evaporator shows great potential for future freshwater production.
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ENVIRONMENTAL TECHNOLOGY
·
2022
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IF 3.475
Ruobing Yu,Zhicong Wu
Although metal–organic frameworks (MOFs) are advantageous to the removal of organic pollutants, the general MOFs in powder form is disadvantageous to their practical applications. In-situ MOF synthesis in alginate gel is a good way to fabricate an MOF composite for many applications, which is different from blending MOF particles with polymers. In-situ synthesis of Zeolitic Imidazolate Framework-8 (ZIF-8) in alginate gel is in the form of beads with rough wrinkles and has many pores inside. When used as an absorbent, in-situ synthesis of ZIF-8 in alginate gel could remove 97.7 ± 0.9% of ofloxacin from ofloxacin solution and the equilibrium adsorption capacity is up to 160.6 ± 1.3 mg/g. During the adsorption, ofloxacin is first brought into the gel by the solvent exchange and gel microchannel adsorption, and it can then be absorbed by in-situ ZIF-8. Moreover, the adsorption efficiency can reach 85.5% even after four cycles of adsorption. We believe that in-situ synthesis of ZIF-8 in alginate gel will be an appropriate material for the removal of ofloxacin in the wastewater.
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