JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
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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Nano Energy
·
2022
·
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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Green Energy & Environment
·
2022
·
IF 12.781
Daqiang Yan,Lin Zhang,Lei Shen,Runyu Hu,Weiping Xiao,Xiaofei Yang
Developing high efficient Pd-based electrocatalysts for oxygen reduction reaction (ORR) is still challenging for alkaline membrane fuel cell, since the strong oxygen adsorption energy and easy agglomerative intrinsic properties. In order to simultaneously solve these problems, Pd/Co 3 O 4 –N–C multidimensional materials with porous structures is designed as the ORR catalysts. In details, the ZIF-67 with polyhedral structure was firstly synthesized and then annealed at high-temperature to prepare the N-doped Co 3 O 4 carbon-based material, which was used to homogeneously confine Pd nanoparticles and obtained the Pd/Co 3 O 4 –N–C series catalysts. The formation of Co–N and C–N bond could provide efficient active sites for ORR. Simultaneously, the strong electronic interaction in the interface between the Pd and N-doped Co 3 O 4 could disperse and avoid the agglomeration of Pd nanoparticles and ensure the exposure of active sites, which is crucial to lower the energy barrier toward ORR and substantially enhance the ORR kinetics. Hence, the Pd/Co 3 O 4 –N–C nanocompounds exhibited excellent ORR catalytic performance, ideal Pd mass activity, and durability in 0.1 mol L −1 KOH solution compared with Co 3 O 4 –N–C and Pd/C. The scalable synthesis method, relatively low cost, and excellent electrochemical ORR performance indicated that the obtained Pd/Co 3 O 4 –N–C electrocatalyst had the potential for application on fuel cells.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
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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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
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
·
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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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
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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ENERGY AND BUILDINGS
·
2022
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IF 7.201
Z.H. Kuai,Ting Yan,Y.J. Huo,Kai Wang,W.G. Pan
At present, low heat storage capacity of organic phase change materials (PCMs) becomes a common problem, and the addition of matrix can contribute to its application in practical engineering. Mixing the porous expanded graphite (EG) with Co 3 O 4 via carbonation of ZIF-67 uniformly, the composite materials PVP@Co 3 O 4 /EG were prepared by crosslinking the agent PVP (polyvinyl pyrrolidone), simultaneously the multilayer structure porous OC-PVP@Co 3 O 4 /EG composites were prepared by melt-blending method with octadecanol (OC). The thermophysical properties of the composite PCMs appeared the difference by adjusting the ratio of OC to Co 3 O 4 . The micromorphology, phase transition enthalpy and phase transition temperature of composite PCMs were determined by scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The multilayer structure prepared by Co 3 O 4 and EG is conducive to the effective transmission of phonons around the axial point, and achieves the goal of efficient heat transfer between PCMs and the external environment. The obtained OC-PVP@Co 3 O 4 /EG (Co 3 O 4 :EG = 1:8) PCMs exhibited excellent thermal conductivity (11.4 W∙m −1 ∙K −1 ), large phase change enthalpy (187.04 kJ∙kg −1 ). The infrared imaging verified that the infrared light intensity of two thermally conductive substrates (Co 3 O 4 :EG = 1:4, 1:8) in the exothermic stage was less than the ratio of Co 3 O 4 :EG is 1:4 and 1:8, which was in accordance with the results of the charging/discharging experiments.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yu Wang,Yunlei Shi,Dazhen Xiong,Zhiyong Li,Huiyong Wang,Xiaopeng Xuan,Jianji Wang
Ammonia (NH 3 ) is produced from nitrogen (N 2 ) and hydrogen (H 2 ) by the Harber-Bosch process at high pressure and high temperature. Due to the reversibility and low conversion efficiency of the reaction, the product contains a large amount of raw gas, which seriously affects the production efficiency of ammonia. Therefore, it is essential to exploit high-performance adsorbents for separating NH 3 from NH 3 /N 2 /H 2 mixtures. Herein, we designed and synthesized a kind of metal–organic framework (MOF) composites by anchoring metal chloride (NiCl 2 , CoCl 2 , or SnCl 2 ) on the bipyridinium groups in the MOF-253(Al) pores. It is found that the optimal composite shows an NH 3 uptake capacity of 18.0 mmol/g at 25.0 °C and 1.0 bar, which is 3.33 times that of the pristine MOF-253(Al), and the composite exhibits a much faster adsorption kinetics of NH 3 than the pristine MOF-253(Al). Significantly, the excellent NH 3 uptake capacity at low pressure allows selective trapping of NH 3 from NH 3 /N 2 /H 2 at 25.0 °C with the selectivity coefficients of 5708 to N 2 and 2320 to H 2 . Spectral measurements reveal that the synergistic action of NH 3 coordination to the metal in the MOF and the hydrogen bonding of NH 3 with both O atoms of the carboxyl groups and Cl − of the guest molecules account for such an excellent capture and selectivity. In general, the strategy developed here is simple and effective for improving the selectivity of NH 3 separation, which opens a new way for the design of high-performance solid adsorbents.
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Food Analytical Methods
·
2023
·Vol. 16
·期 6
·1110-1119
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IF 2.9
Zhong Ming,Huang Lijun,Zhou Binbin,Liu Yuliang,Fang Mian,Wang Ying
A new type of magnetic zinc metal–organic framework molecularly imprinted polymer (MZMMIP) was created by a crystal growth method, combined with molecular imprinting technology. The material was designed to solve the problems associated with metal–organic frameworks, which have the disadvantages of small pore size and low selectivity in the detection field. MZMMIPs were characterized by SEM, XRD, FTIR, TGA, BET, etc. The results showed that MZMMIPs achieved good crystalline form, excellent magnetic separation ability, rich pore structure, and large specific surface area (602.4 m 2 /g). Furthermore, the results of the adsorption experiment show that the crystal growth method with molecular imprint technology not only improved the MZMMIP adsorption capacity (64 mg/g) and microporous aperture, but also accelerated its adsorption (3 min) and elution rate (10 min) on the target product. With the introduction of molecular imprinting technology, MZMMIPs show a suitable adsorption selective performance (selection factor is 1.6) in the adsorption performance test of structural and nonstructural analogs of pyrene. MZMMIPs display good stability and reusability (the adsorption capacity of MZMMIPs decreased by only 21.8% after 10 elution times). The detection method in the study was successfully implemented for the determination of pyrene in vegetable oil, and achieved an excellent detection effect. The detection limit of MZMMIPs to pyrene is 0.11 µg/kg. The recovery ranged from 93.34 to 95.92%.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Nan Zhang,Tao Bao,Yan Gao,Xianliang Xu,Sicen Wang
[email protected] composite was fabricated for greater adsorption capacity through the utilization of corncob, which is a natural, sustainable, and cellulose-rich resource. An in-situ growth strategy was implemented to graft UiO-66-NH 2 on carboxyl-terminal corncob induced by the thermal esterification of critic acid. Subsequently, [email protected] 2 @TpBD was constructed through the Schiff base reaction between 2,4,6-triformylphloroglucinol (Tp) and UiO-66-NH 2 as well as benzidine (BD). The ratio of UiO-66-NH 2 and TpBD was optimized to be 5:3 for enhancing adsorption capacity. Based on the π-π, hydrogen bonding, and -SO 2 -Zr-O- coordination effect, sulphonamides (SAs) were chosen to investigate the adsorption capacity of adsorbent using an in-syringe solid phase extraction (IS-SPE) method. The binding energy calculated using density functional theory (DFT) reached −37.45 Kcal/mol, which indicated the strong interactions between SAs and [email protected] 2 @TpBD. Combined with ultra-performance liquid chromatography (UPLC), a high sensitivity was obtained with low detection of 0.10 μg/L. The prepared [email protected] 2 @TpBD exhibited good reproducibility within relative standard deviations (RSDs) 3.1%-3.4% in intra-batch and 4.3%-8.4% in inter-batch. Moreover, the extraction capacity of adsorbent was not decreased in 20 recycles adsorption–desorption within RSDs 3.8%-8.5%. With features of permanent porosity, multiple active sites, and good renewability, [email protected] 2 @TpBD shows great potential towards industrial applications in the field of adsorption.
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 2
·1003-1015
·
IF 2.081
Chen Anna,Zhang Jin,Zhou Yi,Tang Haiqin
In this study, the MOF-5/BiOBr photocatalyst with microsphere structure was synthesized by hydrothermal method for the first time. The crystal structure, morphology, photoelectric performance and photocatalytic activity of the samples were characterized by XRD, SEM, TEM, XPS and electrochemistry. The results show that the synthesized MOF-5/BiOBr photocatalyst exhibits better photocatalytic performance than pure MOF-5 and BiOBr under simulated sunlight. The efficiency of Rhodamine B (RhB) removal based MOF-5/BiOBr composite (MOF-5 with mass ratio of MOF-5/BiOBr = 20 wt% of) reached 99.7%. The possible photocatalytic mechanism is discussed through the capture experiment of active species. The enhanced photocatalytic performance of the MOF-5/BiOBr composite may be related to the interaction between BiOBr and MOF-5 and the type II charge transfer path. The catalyst has simple preparation process, low cost, high activity under natural light, and high efficiency, and is expected to play a role in the treatment of environmental wastewater. This work provides a new insight for designing MOF-5 based photocatalyst.
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