Journal of Magnesium and Alloys
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2021
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IF 10.088
Shiquan Jiang,Zhiyuan Zhang,Dong Wang,Yuqing Wen,Ning Peng,Wei Shang
Mg alloys are considered the most promising engineering materials because of their unique properties. However, the uncontrolled corrosion rate of these alloys limits their applications. Therefore, in this study, a micro-arc oxidation layer was used as a transition layer to “directly” grow a zinc-based metal-organic framework (MOF) composite coating on the surface of a Mg alloy (AZ91D). Herein, the two zeolitic imidazolate framework (ZIF-8) coatings with different morphologies were separately prepared by homologous metal oxide induction and a one-step in-situ growth method. The superhydrophobic composite coating showed strong hydrophobicity and self-cleaning properties, which could prevent the penetration of water and corrosive ions (Cl − ) into the surface of AZ91D. Electrochemical tests demonstrated that the super-hydrophobic composite coatings greatly enhanced the corrosion resistance of AZ91D, and the corrosion current density decreased from 10 −5 to 10 −9 A/cm 2 . These results indicate that the ZIF-8 coatings are beneficial for improving the hydrophobicity and enhancing the corrosion resistance of Mg alloys. Therefore, MOF composite coatings provide a new strategy that can be used to prepare multifunctional anticorrosion coatings on metal substrates.
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高影响因子
Journal of Materials Chemistry B
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2021
·Vol. 9
·期 48
·9961-9970
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IF 6.331
Shuhan Hui,Qiqi Liu,Yandong Han,Lijuan Zhang,Jun Yang,Shan Jiang,Haisheng Qian,Wensheng Yang
Bacterial infection has increasingly affected people's lives, therefore it is significant to explore novel antibacterial agents and strategies for efficient disinfection. Herein, we designed ZIF-8 based composites ICG@ZIF-8/PDA/Ag, which encapsulate photothermal agent indocyanine green (ICG) and grow polydopamine (PDA) on their surface for in situ reduction to generate Ag nanoparticles. With 20 min of 808 nm laser irradiation at 1.5 W cm−2, 100 μg mL−1 ICG@ZIF-8/PDA/Ag exhibited 100% bactericidal effects toward E. coli and S. aureus bacteria resulting from both hyperthermia of ICG and PDA and chemical toxicity of the released Ag and Zn ions. When the bacterial incubation period was extended to 12 h, the minimum bactericidal concentration (MBC) of ICG@ZIF-8/PDA/Ag was reduced to 6.25 μg mL−1, and this extremely low MBC was due to the long-term chemo-photothermal combinational effect induced by NIR irradiation. Additionally, the composites successfully promote the healing of S. aureus infected wounds on mice. This work constructed photo-responsive antibacterial composites that realize chemo-photothermal synergistic therapy.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Xiaona Wu,Lei Yang,Fanbin Meng,Wenli Shao,Xiang Liu,Miao Li
The incorporation of functional nanomaterials is a promising technique to enhance or develop novel material properties, such as improvement of permeability and selectivity related to water purification and reuse. Herein, ZIF-8 nanoparticles were used to prepare the thin-film nanocomposite (TFN) membranes via both two-step in situ growth and one-step blending interfacial polymerization (IP) methods. The primary purpose was to investigate specific effects of different preparation methods and ZIF-8 nanoparticles on the structure and properties of TFN membranes. The results show that ZIF-8 nanoparticles increased the negative charge, roughness, and hydrophilicity of the polyamide rejection layer. The effects of one-step blending method on the TFN membrane characteristics were limited as compared to the two-step in situ growth method. The effective incorporation of ZIF-8 nanoparticles into TFN membranes increased the water permeability of TFN-ZIF-0.64 to 20.8 ± 0.62 L·m −2 ·h −1 ·bar −1 and enhanced the Na 2 SO 4 rejection to 94.2 ± 3.4%, which is approximately 1.3 times increase in water permeability and 8.0% rise in rejection than those of TFC membrane. Comparatively, two-step in situ growth ZIF-8-modified TFN membranes displayed ultrahigh rejection of typical anionic dyes, demonstrating superior NF performance.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Yu Chen,Zenghui Mai,Senqing Fan,Yuyang Wang,Boya Qiu,Yilin Wang,Jiaojiao Chen,Zeyi Xiao
A catalytic membrane micro-reactor (CMMR) with nano MnO 2 /ZIF-8 immobilized in membrane pores has been fabricated by flowing synthesis and formaldehyde degradation was used to test its catalytic performance. The CMMR with deep-permeation nano structure (DPNS) has good stability, uniform nano MnO 2 /ZIF-8 dispersion and higher loading capacity. The MnO 2 coated on the surface of nano ZIF-8 with the size in the range of 100–150 nm was obtained. The contact between formaldehyde and MnO 2 is enhanced by the effect of even disperse of membrane pores. The enhanced mass transfer can be achieved in the micro-scale pores of the membrane by the confined space effect. A higher amount of MnO 2 loading and higher formaldehyde absorption rate can be achieved by the effect of ZIF-8 in membrane pores. The formaldehyde degradation rate was increased from 82.6% to 94.0%, if the MnO 2 loading capacity was increased from 98 mg g −1 to 344 mg g −1 .
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PROGRESS IN ORGANIC COATINGS
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2021
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IF 5.161
Jianhua Ran,Hongbo Chen,Shuguang Bi,Qingfeng Guo,Changwang Yan,Xiaoning Tang,Deshan Cheng,Guangming Cai,Xin Wang
Excellent photocatalytic activity was achieved on textiles via polydopamine-assisted deposition of Zeolitic Imidazolate Framework-8 (ZIF-8)/TiO 2 composite nanoparticles. Cotton fabrics as the substrate were templated with polydopamine followed by in-situ deposition of ZIF-8/TiO 2 photocatalysts. The heterogeneous nucleation growth of ZIF-8 was effectively improved by the chelation effects between polydopamine and Zn 2+ . SEM, FTIR, XPS, XRD, and TG analysis were employed to study the morphology, chemical constituent, micro-structure and thermal stability of ZIF-8/TiO 2 deposited fabrics. Photoluminescence (PL) spectra have indicated that the composite structure is beneficial in improving the charge transfer ability and decreasing the re-union rate of photogenerated electron pair holes. The mechanism was proposed to reveal both the in-situ deposition of nanocomposites on fiber surface and photocatalytic activity. The ZIF-8/TiO 2 deposited cotton fabrics exhibit good photocatalytic activity and recyclability leading to potential industrial wastewater treatment applications.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Mina Keshvardoostchokami,Mahyar Majidi,Abbasali Zamani,Bo Liu
Fe 3 O 4 /chitosan/ZIF-8 nanocomposite as a novel bio-adsorbent for phenol removal is reported in the current work. The nanocomposite was prepared in situ, and ZIF-8 particles with rhombic dodecahedron morphology were grown on the composite successfully. FTIR, XRD, FESEM, TEM, BET, and VSM were applied to analyze the nanocomposite physiochemically. Central composite design model (CCD) was applied to optimize effective factors such as phenol initial concentration, pH, time, and adsorbent dosage on phenol uptake. The optimum condition was 77.21% (6.43 mg/g) uptake of phenol from 20 mL solution with initial phenol concentration of 20.22 mg/L and pH = 9.91, by 0.1 g of the adsorbent after 43.44 min. The pseudo-second-order and Langmuir patterns as kinetic and isotherm models interpreted phenol adsorption very well. The current research presents a deep understanding of the formation of Fe 3 O 4 /chitosan/ZIF-8 nanocomposite, which has a suitable potential in phenol adsorption.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 48
·21183-21191
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IF 3.288
Pengyao Yu,Sheng Liu,Yuchen Cui,Kun Sun,Ling Zhang,Hailing Guo,Yongming Chai,Chenguang Liu,Lili Fan,Ge Yang,Chunzheng Wang,Svetlana Mintova
A uniform bimetallic hollow ZnFe–N/C (80–180 nm) electrocatalyst is synthesized using a precursor ZnFe-ZIF-8 (100–200 nm) subjected to pyrolysis in an argon atmosphere at 800 °C for 2 hours. The ZnFe–N/C catalyst was deposited on a glassy carbon electrode (GCE), and exhibited a superior electrocatalytic activity with a high onset potential (0.97 V vs. RHE) and half-wave potential (0.85 V vs. RHE), high stability in an alkaline electrolyte, and remarkable resistance to methanol. The high performance of the ZnFe–N/C-3 electrocatalyst is attributed to the hollow structure containing metallic Fe/Fe3C and N doping.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Eryue Song,Kaifeng Wei,Haiqian Lian,Jingxian Hua,Hongxu Tao,Tingting Wu,Yichang Pan,Weihong Xing
Metal-organic frameworks (MOFs) used as molecular sieve membranes materials to gas separation has attracted much attention. However, the separation performance was also limited by its intrinsic flexibility of frameworks. Controlling its flexibility is still a big challenge. Herein, the doping of 2-aminobenzimidazole (ambz) into the ZIF-8 framework can obviously improve its original rigidity, which is due to the improved rigidity of the Zn‒N bond. Correspondingly, the high-quality doped ZIF-8 membrane for effective separation of C 3 H 6 /C 3 H 8 mixture were also fabricated. Compared with the permeation results on pure ZIF-8 membranes, the ambz-doped ZIF-8 membrane exhibited two specific transportation performance improvements. The first was that drop extent of C 3 H 6 /C 3 H 8 selectivity on the doped ZIF-8 membrane with the increase in feeding pressure was decreased, and the selectivity was also irreversible as the feeding pressure was released. This phenomenon was attributed to improved rigidity of the framework. The second was that the C 3 H 6 permeance was almost independent on the permeating temperature, which was also totally different with that on the pure ZIF-8 membrane, resulting from the significant change of adsorptive heat and diffusion energy of propylene on the ambz-doped ZIF-8 membrane. Therefore, this ambz-doped ZIF-8 membrane is promising in real world C 3 H 6 /C 3 H 8 separation.
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Science Advances
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2020
·Vol. 6
·期 12
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IF 13.117
Lizhen He,Guanning Huang,Hongxing Liu,Chengcheng Sang,Xinxin Liu,Tianfeng Chen
Rational design of potent antioxidative agent with high biocompatibility is urgently needed to treat ischemic reperfusion-induced ROS-mediated cerebrovascular and neural injury during ischemia strokes. Here, we demonstrate an in situ synthetic strategy of bioactive zeolitic imidazolate framework-8–capped ceria nanoparticles (CeO2@ZIF-8 NPs) to achieve enhanced catalytic and antioxidative activities and improved stroke therapeutic efficacy. This nanosystem exhibits prolonged blood circulation time, reduced clearance rate, improved BBB penetration ability, and enhanced brain accumulation, where it effectively inhibits the lipid peroxidation in brain tissues in middle cerebral artery occlusion mice and reduces the oxidative damage and apoptosis of neurons in brain tissue. CeO2@ZIF-8 also suppresses inflammation- and immune response–induced injury by suppressing the activation of astrocytes and secretion of proinflammatory cytokines, thus achieving satisfactory prevention and treatment in neuroprotective therapy. This study also sheds light on the neuroprotective action mechanisms of ZIF-8–capped nanomedicine against reperfusion-induced injury in ischemic stroke.
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PubMed
高影响因子
Applied Nanoscience
·
2020
·Vol. 10
·期 5
·1409-1419
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IF 2.88
Ge Bo,Yang Hang,Xu Xiaochen,Ren Guina,Zhao Xingchuan,Pu Xipeng,Li Wenzhi
How to efficiently treat dissolved and insoluble pollutants in water is a difficult problem. In the presence of ZIF-8 and BiOBr, superhydrophobic aerogel with oil/water separation and photodegradation performance was prepared by simply dipping the functional composite material in the support surface of the melamine sponge. The problem of surface oil pollution can be solved using its superhydrophobicity and superoleophilicity. The existence of BiOBr in aerogels makes it possible for the pollutants dissolved in water to degrade under light irradiation. The band gap width of BiOBr ( E g = 2.6 eV) and the density of the photogenerated carriers (5.21 × 10 23 cm −3 ) were determined by DRS and the Mott–Schottky curve, respectively. The positions of the valence band (2.97 eV) and conduction band (0.37 eV) were confirmed by theoretical calculation. The robustness between the functional coating and the substrate was ensured through 4000 friction (1.06 × 10 5 Pa) and 100 compression tests, which shows good mechanical stability of the material. This study is expected to provide a new way of thinking with regard to water pollution treatment and material multi-function.
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APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Meixia Wang,Jing Zhang,Xibin Yi,Xinfu Zhao,Benxue Liu,Xiaochan Liu
In this study, chitosan was used to prepare nitrogen-doped carbon aerogels (CAs) anchored by ZIF-8 derived porous carbon (ZIF-8-C) using a facile in-situ deposition method combined with subsequent carbonization. CAs possessing a 3D mesoporous structure with interlaced nanosheets can be used as the skeleton for growth of ZIF-8 derived microporous carbon. The coexistence of mesopores and micropores can not only create more channels for electrolyte ions accessing, but also can provide electrical-double-layer capacitance. The results of electrochemical performance revealed that the ZCCA composite electrode shows the large specific capacitance of 241.6 F/g at a current density of 0.5 A/g in 2.0 M KOH electrolyte and superior cycle performance (capacity retention of 90% after 5000 cycles). The improvement in the electrochemical properties is owed to its hierarchically porous structure, ultrahigh specific surface area and moderate nitrogen contents. The preparation method offers the smart design of CAs-supported MOF-derived material for high-performance energy storage applications.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 95
·期 3
·730-738
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IF 2.659
Yating Wang,Xu Li,Xiu Dai,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinglong Wang
BACKGROUND With the rapid industrial and urbanization development, a large amount of oily wastewater is generated from various sources. It is mutagenic and carcinogenic to human health and seriously affects the ecosystem. In this study PLA/ZIF-8@C600 nanofibers were prepared for oil adsorption. RESULTS Hybrid nanoparticles (ZIF-8@C600) of carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8) with high specific surface area and porous structure were prepared by co-deposition and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FITR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and contact angle measurement. Biodegradable composite nanofiber membranes of poly(lactic acid) (PLA) and ZIF-8@C600 were manufactured by electrospinning. The SEM and contact angle results showed that the addition of ZIF-8@C600 could adjust the diameter, porosity, pore size and hydrophobicity of the composite electrospun nanofibers. The PLA/ZIF-8@C600 porous membranes had good oil sorption properties in oil–water mixture and emulsion. The oil adsorption capacity of the sample with 1 wt% ZIF-8@C600 was improved by ∼72.59% compared with that of pure PLA (13.5 g g −1 ), which demonstrated that the PLA/ZIF-8@C600 fibers were good candidates as oil sorbents. The adsorption kinetics of the membranes on paraffin liquid was in accordance with pseudo-second-order kinetics. CONCLUSION The addition of hybrid ZIF-8@C600 improved the hydrophobic properties and oil adsorption capacity of PLA/ZIF-8@C600 porous membranes. Because PLA is an environmentally friendly polymer, composite membranes based on it can avoid secondary pollution. Overall, these findings have good prospects for future treatment of oily wastewater. © 2019 Society of Chemical Industry
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