Journal of Cleaner Production
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2021
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IF 9.297
Xi Li,Shiwen Wang,Xiao Zhang,Danhua Mei,Yanhua Xu,Peng Yu,Yongjun Sun
Ultrasmall TiO 2 nanoparticles (average diameter of 6.6 nm) were encapsulated inside zeolitic imidazolate framework-8 (ZIF-8) via a self-assembly method, and the synthesized TiO 2 @ZIF-8 catalyst was applied for the removal of toluene using nonthermal plasma (NTP). Physicochemical characterization was performed to investigate the structure and morphology of TiO 2 @ZIF-8. The results revealed the high dispersion of TiO 2 nanoparticles in ZIF-8 and the formation of a Z-type heterojunction between TiO 2 and ZIF-8, which efficiently utilized the UV light generated during plasma discharge to produce •OH and •O 2 ‾ . Upon treating toluene exhaust gas of 100 mg·(m 3 ) −1 at 92.5% relative humidity, the toluene conversion efficiency was significantly improved to 91.17% with a CO X selectivity of 76.45% by TiO 2 @ZIF-8 in NTP-catalysis at a specific energy density (SED) of 507 J L −1 , which was improved by 45.96% and 52.27%, respectively. This was mainly due to the good hydrophobicity of ZIF-8, which helped maintain efficient catalytic performance under high humidity. The maximum ozone decomposition efficiency of 99.22% was achieved for the accelerated charge transfer efficiency and nearly formed NTP discharge behavior in the porous structures of the catalyst. In the 36-h stability test, high efficiency of toluene conversion, CO X selectivity, and ozone decomposition were maintained with no significant decay observed. Discharge characteristic analysis and electron paramagnetic resonance (EPR) characterization revealed the mechanism of toluene degradation in which electrons, ·OH, ·O 2 ⁻, and O 3 participated in toluene degradation. The possible pathways of toluene degradation were proposed based on the intermediates detected by chromatography–mass spectrometry. This work provides a new approach for anchoring and dispersing nanoparticles by ZIF-8 to avoid the reunion of nanoparticles and a new direction for synthesizing high-performance catalysts for volatile organic compound (VOC) degradation in NTP-catalysis.
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JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Xilu Hong,Zong Lu,Yali Zhao,Luxi Lyu,Li Ding,Yanying Wei,Haihui Wang
As one of the green, renewable, and clean energy resources, hydrogen is widely developed and utilized throughout the world. Highly efficient membrane separation for hydrogen production is required to give promising gas permeance with enough H 2 selectivity. The membranes are desired to be produced in large-scale, fast and facile methods. Here we report for the first time a kind of freestanding MXene-ZIF-8 dual-layered membrane for hydrogen separation. Fast synthesis of such membranes is realized by combining electrophoretic deposition (EPD) and fast current-driven synthesis (FCDS), achieving the assemble of MXene layer and growth of ZIF-8 layer, respectively, overcoming the traditional time-consuming vacuum filtration methods and solvothermal synthesis . The MXene-ZIF-8 dual-layered membrane prepared within 20 min exhibits significantly improved gas separation performance, whose H 2 /CO 2 selectivity increases from 44 for the pristine MXene membrane to 77 with H 2 permeance of 5.97 × 10 −8 mol m −2 s −1 Pa −1 . This concept of structure design of membrane can also be extended to other dual-layered membranes, including various 2D nanosheet layers combined with different MOF layers.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Jiaying Pei,Zhongsheng Chen,Youqun Wang,Bo Xiao,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
In this study, a 10%Fe-ZIF-8-300-PO 4 adsorbent was synthesized and its adsorption performance for U(VI) was investigated comprehensively. It was found that after a series of operations such as Fe doping, thermal activation and phosphorylation, the adsorption performance for U(VI) can be significantly improved on the basis of maintaining the skeleton characteristics of ZIF-8. The results showed that the optimal Fe-doping amount and thermal activation temperature was 10% and 300°C, respectively. The adsorption of U(VI) on 10%Fe-ZIF-8-300-PO 4 reached equilibrium within 60 min, and conformed to pseudo-second-order kinetic equation. Furthermore, a maximum saturated adsorption capacity of 691.83 mg/g was achieved. The above results demonstrated that 10%Fe-ZIF-8-300-PO 4 may be used to efficiently remove U(VI) from uranium-containing radioactive waste water.
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CHEMIE INGENIEUR TECHNIK
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2021
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IF 1.672
Luxi Lyu,Houxiao Wu,Libo Li,Yanying Wei,Haihui Wang
Metal-organic frameworks (MOFs) show great potential for adsorption separation. However, MOFs' flexibility may influence their adsorption behaviors. Here, for the first time we prepare ZIF-8 powder dominated with stiffened ZIF-8_Cm phase under an external E-field. By comparison, we find that the flexibility of ZIF-8 has little influence in equilibrium-based separation behavior for C 3 H 6 /C 3 H 8 . However, the stiffened ZIF-8 formed in E-field presents an obviously decreased diffusion rate for C 3 H 8 , whose C 3 H 6 /C 3 H 8 kinetic-based separation factor is around 2.5 times higher than that of the traditional ZIF-8 powder.
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ACS Applied Nano Materials
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2021
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IF 5.097
Ying Li,Shujuan Li,Min Bao,Linqun Zhang,Carlo Carraro,Roya Maboudian,Anran Liu,Wei Wei,Yuanjian Zhang,Songqin Liu
Nanomaterials possessing intrinsic enzyme-mimetic activity are becoming an important topic of current research. However, their enzyme-mimetic activity is limited by the particle size of the nanomaterials. In this study, Pd nanoclusters with an average size of 1.4 nm are synthesized by using a metal organic framework, zeolitic imidazolate framework-8 (ZIF-8), as a matrix via an impregnation-reaction method. By virtue of the confined channels of ZIF-8 and the strong chemical interaction between the Pd nanoclusters and ZIF-8 framework, the Pd nanoclusters show a high dispersity and stability. The obtained Pd@ZIF-8 is proven to have enhanced intrinsic peroxidase-like activity, showing Michaelis–Menten constants (Km) as high as 0.13 mM for 3,3′,5,5′-tetramethylbenzidine and 14.02 mM for hydrogen peroxide. Colorimetric testing and electron spin resonance spectra reveal that radicals are generated during the catalytic process of peroxidase-like Pd@ZIF-8 toward H2O2. With the addition of glucose or cholesterol oxidase, the Pd@ZIF-8 can be utilized to construct a highly selective and sensitive fluorescent sensor for glucose and cholesterol, exhibiting a detection limit of 0.10 and 0.092 μΜ, respectively. Additionally, the proposed fluorescent platform exhibits the capability to detect glucose and cholesterol in serum samples with satisfactory recovery, indicating potential application prospects in biochemical analysis.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Song Ma,Yanzheng Ji,Yongjie Dong,Siqi Chen,Yingjie Wang,Shaoyu Lü
Stimulus-responsive pesticide or fertilizer systems have been emerged to improve the use efficiency of agrochemicals , reduce over-application and ensuing environmental problems. However, environmental-friendly synthesis of these systems still remain challenging. In this work, an environmental-friendly synthesis strategy has been developed to form a pesticide and fertilizer combination to achieve the integration of plant protection and nutrient supply. This pesticide-fertilizer combination system was fabricated using ammonium zinc phosphate (ZNP) and in-situ synthesized zeolitic imidazolate framework-8 (ZIF-8) as nutrients resources, and dinotefuran (DNF) as a pesticide. DNF was encapsulated in-situ (loading capacity of 12.32 ± 0.46%) during the ZIF-8 crystal synthesis process, rather than loaded by further adsorption, which improved its stability and prevented premature or rapid release. The hydrophobic ZIF-8 provided a pH-responsive slow-release behavior. The cumulative released DNF within seven days at pH 4.0, 7.0 and 10.0 was 66.30%, 40.41%, and 37.44%, respectively. The pesticide-fertilizer combination system showed significant effects on corn seed pre-cultivation, soil cultivation and pest control. This work provides a strategy for the integration of pesticide and fertilizer, which will reduce negative environmental effects caused by their over-applications and have great potential in modern sustainable agriculture.
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PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 30
·期 10
·3862-3868
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IF 1.941
Wei Xiuxia,Xu Dongpo,Ge Kangjie,Qi Shuyan,Chen Yan
In this study, a simple and efficient strategy with bola-form template to construct the two-dimensional ultrathin multilayers ZIF-8 nanosheets was developed, the nanosheet was used as antibacterial for Aeromonas hydrophila ( A. hydrophila ) for the first time. It shows the obviously lamellar structure with eleven ZIF-8 lamellar crystal layers uniformly distributed in each nanosheet, the thickness of the whole nanosheet is approximately 36 nm, and the distance between the two adjacent layers is approximately 3.6 nm. It has the high antibacterial efficacy for A. hydrophila , which can be killed within 8 h.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yanhua Liu,Zhou Zhu,Xibo Pei,Xin Zhang,Xinting Cheng,Shanshan Hu,Xiaomeng Gao,Jian Wang,Junyu Chen,Qianbing Wan
Designing bone adhesives with adhesiveness, antideformation, biocompatibility, and biofunctional effects has great practical significance for bone defect reconstructive treatment, especially for bone graft repair surgery. Here, we designed zeolitic imidazolate framework-8 nanoparticle (ZIF-8 NP)-modified catechol–chitosan (CA-CS) multifunctional hydrogels (CA-CS/Z) to stabilize the bone graft environment, ensure blood supply, promote osteogenic differentiation, and accelerate bone reconstruction. Characterizations confirmed the successful synthesis of CA-CS/Z hydrogels. Hydrogels exhibited advanced rheological properties, reliable mechanical strength, and excellent adhesion for clinical applications. Based on excellent biocompatibility, it could enhance paracrine of the vascular endothelial growth factor (VEGF) in rat bone marrow mesenchymal stem cells (rBMSCs) to ensure blood supply reconstruction in bone defect areas. Furthermore, the ZIF-8 NPs released from the hydrogels could also up-regulate the production and secretion of alkaline phosphatase, collagen 1, and osteocalcin, promoting the osteogenic differentiation of rBMSCs. In addition, the antibacterial properties of CA-CS/Z could also be observed. In vivo experiments further provided a powerful proof that CA-CS/Z promoted vascularized osteogenesis in wound areas by stabilizing bone graft materials and greatly accelerated the speed and healing of bone reconstruction. These results indicate the promising potential of CA-CS/Z hydrogels with promoting implantation stability, angiogenesis, and osteogenesis for bone regeneration applications.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Xingxing Yin,Peng Mu,Qingtao Wang,Jian Li
Magnesium (Mg) and its alloys are regarded as the most promising engineering materials because of their unique property. However, the Mg alloys were easily corroded in humid environments, which restricted their wider applications. Herein, the superhydrophobic ZIF-8/PVDF/LDH (SZPL) double-layered coating was fabricated on Mg alloys via electrodeposition and dip-coating methods, which consisted of the underlying layered double hydroxide (LDH) transition structure and top superhydrophobic zeolitic imidazolate framework-8 (ZIF-8) layer. Besides, the LDH transition structure not only worked as a protection shield but also strengthened the binding force between the substrate and the top superhydrophobic ZIF-8 layer. The top superhydrophobic ZIF-8 layer could serve as an armor on the LDH layer to further prevent the corrosive ions from infiltrating the microporous defects. In addition, the as-prepared SZPL double-layered coating showed robust superhydrophobic and self-cleaning properties, which could block the electrolyte invasion. Furthermore, the electrochemical tests demonstrated that the SZPL coating highly enhanced the corrosion protection ability of Mg alloys. Moreover, the superhydrophobic ZIF-8-based coating could still retain excellent anticorrosion property after immersion in 3.5 wt % NaCl solution for 7 days. The enhanced anticorrosion ability was ascribed to the fact that a synergistic effect of the underlying LDH transition layer hindered the transmission of aggressive ions and the top superhydrophobic ZIF-8-based coating decreased the contact area of the substrate with corrosive solution. Therefore, such coatings offer a new strategy for fabricating excellent anticorrosive coatings with robust superhydrophobicity and self-cleaning performance on metal substrates.
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ACS Applied Polymer Materials
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2020
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IF 0
Xu Ou,Yongyuan Ren,Jiangna Guo,Yingjie Zhou,Yinghui Yuan,Qinbo Liu,Feng Yan
It is highly challenging to separate stabilized water/oil emulsions with sizes below 20 μm. Here, we propose a simple and scalable process via the in situ grafting of ZIF-8 nanoparticles and a poly(ionic liquid) (PIL) onto a commercial cotton cloth (CC) fabric. Switchable wettability between superhydrophilicity/underwater superoleophobicity and superhydrophobicity/superoleophilicity was easily realized via the anion exchange of the PIL. ZIF-8 nanoparticles effectively improved the superhydrophilicity and superolelphilicity of ZIF-8@PIL-grafted cotton cloth (CC-ZIF-PIL), while also performing the dual functions of the separation of oil-in-water (O/W) and water-in-oil (W/O) emulsions. Accordingly, effective water/oil emulsion separation with a high efficiency (η > 99%), selectivity, stability, and durability was obtained using the CC-ZIF-PIL. These features indicate that CC-ZIF-PIL has promising application in switchable water/oil emulsion separation devices.
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JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Tengyang Zhu,Sheng Xu,Fen Yu,Xi Yu,Yan Wang
In this study, ZIF-8@GO composites with continuous inner channels for ethanol molecules were prepared by the in-situ growth of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles onto the surface of graphene oxide (GO) nanosheets , and filled into polydimethylsiloxane (PDMS) matrix to fabricate PDMS/ZIF-8@GO mixed matrix membranes (MMMs) for ethanol recovery via pervaporation . The as-prepared ZIF-8@GO composites and PDMS/ZIF-8@GO MMMs were characterized by various techniques. The results showed that ZIF-8 nanoparticles were uniformly dispersed on the surface of GO nanosheets and the hydrophobicity of ZIF-8@GO composites was stronger than GO due to the surface modification of GO by hydrophobic ZIF-8. Moreover, ZIF-8@GO composites as the filler not only exhibited the excellent compatibility with PDMS but also showed the good dispersion in PDMS matrix as compared to ZIF-8 nanoparticles. Therefore, ZIF-8@GO-based MMMs showed better separation performance than ZIF-8-based MMMs. The pervaporation performance of PDMS/ZIF-8@GO MMMs was studied by adjusting the filler type, particle loading, membrane thickness, and feed temperature. The optimized PDMS/ZIF-8@GO MMMs displayed a prominent separation factor of 22.2 with a total flux of 443.8 g/m 2 h with 5 wt% ethanol aqueous solution at 40 °C, and therefore the superior pervaporation performance to most other PDMS-based MMMs. The excellent pervaporation results were attributed to the synergistic effect of GO nanosheet as a strong barrier and hydrophobic ZIF-8 nanoparticles with the continuous inner channels. The synergistic effect of hybrid particles may provide valuable guidance to the development of high-performance PDMS-based MMMs for pervaporation recovery of various organic compounds.
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CRYSTENGCOMM
·
2019
·Vol. 21
·期 45
·6935-6944
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IF 3.382
Qunling Fang,Yuhang Sun,Jinyu Duan,Linfeng Bai,Kezhu Xu,Qinshan Xiong,Huajian Xu,Ken Cham-Fai Leung,Ailing Hui,Shouhu Xuan
Metal–organic framework (MOF)-derived nanostructures exhibit wonderful characteristics and possess broad application potential by modulating the complex composition and inner nanostructure. Although various MOF-based nanocomposites have been successfully developed, a facile method that can easily modulate the structure-dependent chemical components of the MOF-derived hybrids remains a challenge. By coating zeolitic imidazolate framework-8 (ZIF-8) with Au/polydopamine (Au/PDA) via in situ redox-oxidation polymerization of HAuCl4 and dopamine, it was found that the ZIF-8 templates were simultaneously etched off to give Au/PDA hybrid microcapsules with a cubic shape. This one-step sacrificial templating process followed a competing chelation between gold ions and Zn2+ cations to 2-methylimidazole and PDA; thus, both the hollow and the yolk-like hybrid cubic microcapsules were controllably obtained by varying the synthetic dynamics. Owing to the hollow nature, penetrated PDA shell, well-distributed Au nanocrystals, and unique stable nanostructure, the non-spherical Au/PDA hybrid cubic microcapsules showed high performance in catalyzing the reduction of 4-nitrophenol as well as adsorption/release of ibuprofen as a model drug. Moreover, this simple strategy offers a controllable design in developing multifunctional nanocomposites with definite inner nanostructures and activities for nanocatalysis, drug delivery, energy storage etc.
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