JOURNAL OF SOLID STATE CHEMISTRY
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2018
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IF 2.179
Mengmeng Fan,Fangyuan Gai,Yu Cao,Zhenbo Zhao,Yuhui Ao,Yunling Liu,Qisheng Huo
This work demonstrated the design and synthesis of millimetre-scale hierarchical porous spheres based on ZIF-8 and CS (chitosan) by in situ assembly and post-thermal treatment technology. The ZIF-8/CS spheres have been synthesized according to the assembly method, which exhibited honeycomb internal structures and micropores of 0.77 nm. While the annealed ZIF-8/CS spheres exhibited obvious mesopores with a BET surface area of 626.85 m 2 g −1 and maintained the honeycomb internal structures, which were obtained by calcinations in the tube furnace under nitrogen protection at 500 °C for four hours. The annealed ZIF-8/CS spheres exhibited hierarchical porous with macropores, micropores and mesopores after annealing process. The SEM image and the XRD pattern of annealed ZIF-8/CS spheres suggested the maintenance of shape and crystal structure of ZIF-8, indicated that the annealed ZIF-8/CS spheres were stable and robust. Particularly, the CO 2 uptake of annealed ZIF-8/CS spheres with 500 °C is 0.99 mmol/g, which obvious higher than that of as-synthesized ZIF-8/CS spheres and samples annealed at 450 °C, 525 °C and 550 °C. The enhancement of CO 2 uptake may attribute to the carbonization of CS and the enlarge micropores of ZIF-8 after annealing process. This approach could induce a simple way for industrial structuring ZIF-8-based adsorbents with improved CO 2 uptake.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2015
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IF 3.453
Hong Jiang,Qing Yan,Rizhi Chen,Weihong Xing
Pd@ZIF-8 nanoparticles with uniform size and morphology were prepared via an assembly method that enables the crystallization of ZIF-8 in methanol in the presence of polyvinylpyrrolidone (PVP)-modified Pd nanoparticles. The molar ratios of Pd/Zn 2+ and 2-methylimidazole (Hmim)/Zn 2+ are important parameters affecting the physical and catalytic properties of the Pd@ZIF-8. The catalytic activities of the hybrid catalysts were evaluated by the hydrogenation of p -nitrophenol to p -aminophenol. The results indicate that the increase of Pd loading and p -nitrophenol conversion can be tuned by adding more amounts of PVP-Pd colloid, but a suitable amount of PVP-Pd (Pd/Zn 2+ ≤ 0.012) is helpful to the control of particle size of Pd@ZIF-8 and encapsulation of the Pd nanoparticles within the ZIF-8 crystals. Pd@ZIF-8 catalysts prepared with excessive or equal molar of Hmim relative to Zn 2+ have similar morphology and uniform particle size, where the Pd nanoparticles are fully confined within the ZIF-8 crystals without aggregation. Furthermore, the Pd@ZIF-8 catalysts exhibit the better catalytic performance for the p -nitrophenol hydrogenation owing to the high loading of well-dispersed Pd nanoparticles with the decreased Hmim/Zn 2+ molar ratio. This work would aid the development of high-performance Pd@ZIF-8 catalysts.
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ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Cuiqing Wu,Qi Liu,Rongrong Chen,Jingyuan Liu,Hongsen Zhang,Rumin Li,Kazunobu Takahashi,Peili Liu,Jun Wang
Superhydrophobic coatings are highly promising for protecting material surfaces and for wide applications. In this study, superhydrophobic composites, comprising a rhombic-dodecahedral zeolitic imidazolate framework (ZIF-8@SiO2), have been manufactured onto AZ31 magnesium alloy via chemical etching and dip-coating methods to enhance stability and corrosion resistance. Herein, we report on a simple strategy to modify hydrophobic hexadecyltrimethoxysilan (HDTMS) on ZIF-8@SiO2 to significantly improve the property of repelling water. We show that various liquids can be stable on its surface and maintain a contact angle higher than 150°. The morphologies and chemical composition were characterized by means of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FI-IR). In addition, the anticorrosion and antiattrition properties of the film were assessed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization and HT, respectively. Such a coating shows promising potential as a material for large-scale fabrication.
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2016
·Vol. 39
·期 18
·3647-3654
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IF 2.741
Yan Xu,Jingjie Jin,Xianliang Li,Yide Han,Hao Meng,Junbiao Wu,Xia Zhang
Core–shell metal–organic framework materials have attracted considerable attention mainly due to their enhanced or new physicochemical properties compared with their single-component counterparts. In this work, a core–shell heterostructure of CoFe 2 O 4 -Zeolitic Imidazolate Framework-8 (ZIF-8@CoFe 2 O 4 ) is successfully fabricated and used as an solid-phase extraction adsorbent to efficiently extract Congo Red and Basic Red 2 dyes from contaminated aqueous solution. Vibrating sample magnetometry indicates that the saturated magnetization of ZIF-8@CoFe 2 O 4 is 3.3 emu/g, which is large enough for magnetic separation. The obtained hybrid magnetic metal-organic framework based material ZIF-8@CoFe 2 O 4 can remove the investigated dyes very fast within 1 min of the contact time. The adsorbent ZIF-8@CoFe 2 O 4 also shows a good reusability. After regeneration, the adsorbent can still exhibit high removal efficiency (∼97%) toward Congo Red for five cycles of desorption–adsorption. This work reveals the great potential of core–shell ZIF-8@CoFe 2 O 4 sorbents for the fast separation and preconcentration of organic pollutants in aqueous solution before high-performance liquid chromatography analysis.
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MATERIALS & DESIGN
·
2024
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IF 7.6
Lijie Wang,Li Wan,Jianxin Wu,Yeke Chen,Yuting Yang,Tian Deng,JingTing Wu,Weiwei Xue,Li Song,Fang Dai
The guided tissue regeneration (GTR) procedure has become an important process for the treatment of periodontal tissue regeneration, using the membrane as a mechanical barrier to generate a distance across the defect that subsequently allowing bone regeneration. Due to the complexity of periodontal microenvironment caused by bacterial infections, inflammation, and fibrous tissue penetration, the guided tissue regeneration membrane is required to have antibacterial and barrier functions. We developed a loaded methylene blue @ ZIF-8 and hydroxyapatite gradient thermoplastic polyurethane Janus membrane for antibacterial osteogenic and barrier. This Janus membrane with a porous gradient structure was prepared to use phase-conversion method. The rough layer facilitated cell growth and promoted periodontal bone regeneration, whereas the smooth layer isolated the growing fiber tissue.The rapid release of reactive oxygen species in the early stage and continuous release of zinc ions by methylene blue @ZIF-8 can achieve long-term synergistic antibacterial effect, with antibacterial rates of 84 % and 72 % against Escherichia coli and Staphylococcus aureus, respectively, which can effectively reduce the local inflammation caused by bacteria. In summary, we applied the Janus membrane to a rat periodontal bone defect model, and the membrane showed good surgical performance, barrier properties, osteogenic properties, and antibacterial effects, which could have broad application prospects in the treatment of periodontal bone defects.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2024
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IF 3.8
Hui Yingfei,Wang Mingyue,Liu Yinsheng,Peng Liping,Tian Jiaying,Ren Borong,Guo Hao,Yang Wu
In this study, a ratiometric fluorescent sensor CdTe QDs@ZIF-8 with butterfly spectra is successfully constructed by in situ encapsulating mercaptopropionic acid-modified CdTe quantum dots in zeolitic imidazolate framework-8 (ZIF-8) with a simple strategy, and used for the detection of tetracycline in fluorescence/smartphone colorimetry dual-mode. ZIF-8 not only reduces the agglomeration of the quantum dots but also surprisingly generates a new green fluorescence signal at 524 nm while the red fluorescence of the CdTe quantum dots at 650 nm quenches when tetracycline is added. The two opposing fluorescence signals create a butterfly-shaped fluorescence spectrum, allowing the sensor to detect tetracycline over a linear range of 0–70 μM with the detection limit (LOD) of 0.0155 μM by using a ratiometric fluorescence technique. What is more, based on the obvious color change of the fluorescent sensor gradually from red to green under UV light, a highly stable point-of-care testing sensor has been developed for on-site detection of tetracycline through color recognition by smartphones, which can be used for real-time detection of this antibiotic in the range of 0–1000 μM with the LOD of 0.0249 μM. This work provides a simple and efficient method for the on-site detection of tetracycline. Graphical Abstract
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高影响因子
RSC Advances
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2024
·Vol. 14
·期 47
·34848-34854
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IF 3.9
Mutu Lin,Qiaohong Wang,Yun Dai,Jinyuan Chen,Yiming Lin
A highly sensitive and efficient home-use method is impressive and promising in the self-monitoring of chronic prostatitis (CP). Herein, we developed a glucose oxidase-zeolitic imidazolate framework-8-antibody composite (GOx@ZIF-8@Ab2) to achieve highly sensitive point-of-care testing (POCT) of urinary prostatic exosomal protein (PSEP) by combining it with a personal glucometer (PGM). The developed GOx@ZIF-8@Ab2 was prepared through a simple but effective biomineralization reaction and a strong binding affinity between Zn2+ and Fc region of the antibody. This bifunctional material GOx@ZIF-8@Ab2 could not only specifically recognize the PSEP via immunoreaction but also wrap a large number of GOx molecules. Following the sandwich immunoreaction, the prepared GOx@ZIF-8@Ab2 facilitated hydrolysis of glucose in a one-to-many fashion, amplifying the detection signal and greatly improving the sensitivity of PGM detection. In comparison to those of the conventional enzyme-linked immunosorbent assay (ELISA), the detection time of the developed technique was shortened to 45 minutes and its limit of detection (0.23 pg mL−1) was reduced by 4–5 orders of magnitude. This technique was successfully utilized for detecting PSEP in human urine samples with a recovery rate of 96–116%. Owing to its rapid, ultrasensitive, specific and portable features, the as-designed platform based on GOx@ZIF-8@Ab2 and the PGM device holds great promise as a home-use POCT platform for self-monitoring of CP and other chronic diseases.
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高影响因子
Small Methods
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2024
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IF 10.7
Chunyang Li,Yujian Li,Shaoyan Wu,Gui Li,Juan Li,Yan Zhao,Huan Cai,Jia Shu,Mingxuan Song,Qing Fu,Jianbo Yuan,Xin Gao,Zhujun Ai,Xiaosong Li,Rui Chen,Zhong Zuo
Catalytic nanoparticle@metal-organic framework (MOF) composites have attracted significant interest in point-of-care testing (POCT) owing to their prominent catalytic activity. However, the trade-off between high loading efficiency and high catalytic activity remains challenging because high concentrations of nanoparticles tend to cause the misjoining and collapse of the MOFs. Herein, a facile strategy is reported to encapsulate high concentrations of platinum (Pt) nanoparticles into zeolitic imidazolate framework-8 (ZIF-8) using polydopamine (PDA) as a support for Pt@ZIF-8 and as a flexible scaffold for further immobilization of Pt nanoparticles. The resulting composite (Pt@ZIF-8@PDA@Pt) exhibits ultrahigh Pt nanoparticle loading efficiency, exceptional catalytic activity, stability, and a bright colorimetric signal. Following integration with lateral flow immunoassay (LFIA), the detection limits for pre- and post-catalysis detection of B-type natriuretic peptide (NT-proBNP) are 0.18 and 0.015 ng mL −1 , respectively, representing a 6-fold and 70-fold improvement compared to gold nanoparticle-based LFIA. Moreover, Pt@ZIF-8@PDA@Pt-based LFIA achieves 100% diagnostic sensitivity for NT-proBNP in a cohort of 184 clinical samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Xingyu Kang,Jianhui Lv,Lei Han,Bin Huang,Huizhang Zhao,Dong Wang,Hairui Fang
Nitrogen oxide (NO 2 ) is common by-products of industrial production, posing significant health risks to workers. Therefore, real-time monitoring of NO 2 is crucial. In this study, innovative In 2 O 3 -ZnO nano-materials were prepared by combining In 2 O 3 with ZIF-8 via electrospinning, for detecting trace amounts of NO 2 at room temperature (RT). Compared to pure In 2 O 3 , the In 2 O 3 -ZnO nano-materials (V2) with a 10 % weight ratio of ZIF-8 exhibited a significantly higher response (389.99) and a faster response time (16.9 s) to NO 2 under ultraviolet (UV) irradiation at RT. The superior gas sensing performance of the V2 nano-materials is attributed to the formation of n-n heterojunctions, enhanced optical absorption, increased oxygen vacancy ratio, and excellent dispersion among the nano-materials. The results demonstrate that V2 nano-materials can detect NO 2 at parts-per-billion (ppb) levels at RT, making them suitable for monitoring trace amounts of NO 2 in open environments. Furthermore, a portable real-time NO 2 monitoring device was constructed using V2 as the sensing material, an LM358-based amplifier circuit for data acquisition, an STM32F103C8T6 microcontroller as the main control unit, and a buzzer as an alarm device. Compared to devices using a helical Ni-Cr wire as an indirect heat source, this integrated NO 2 detection device offers real-time alarms with lower energy consumption. This application not only enhances worker health and safety in industrial environments but also demonstrates higher energy efficiency in practical application.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 6
·066502
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IF 3.1
Guang Li,Xiangmei Tang,Kuang Sheng,Can Fang,Yiduo Zeng,Zhaomin Lu,Yaping Wang,Hu Zhou,Qingfeng Yi
Carbon-based electrocatalysts derived from zeolitic imidazolate framework-8 (ZIF-8) have garnered significant attention, owing to their structural advantages, high surface area, and tunable active sites. Herein, we report the synthesis of heteroatom sulfur (S) modified ZIF-8 derived carbon nanocages (ZnS@N/S-C) for oxygen electrocatalysis through self-assembly and two-step pyrolysis. The resultant ZnS@N/S-C exhibits catalytic activity towards oxygen reduction reaction (ORR) with high half-wave potential (0.86 V) and stability (91.4%), separately, which is comparable to or superior to Pt/C. Furthermore, the application of ZnS@N/S-C as a cathode for Zn-air batteries (ZABs) demonstrates performance metrics such as an open-circuit voltage of 1.407 V, a power density of 114.4 mW cm−2, and a specific capacity of 764.6 mAh gZn−1, etc surpassing Pt/C. The performance of ZnS@N/S-C can be attributed to the fact that the introduction of S significantly increases the specific surface area, pore volume, and defect extent of the catalyst, while optimizing the electronic structure and generating ZnS active nanocrystals. This work employs a simple sulfurization strategy to enhance the ORR activity of ZIF-8-derived Zn-based catalysts with fully filled 3d orbitals, providing guidance for the development of such materials.
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Lei Wu,Qiuyan Ye,Kun Zhang,Xiaoyan Guo,Jiaqiao Li,Yongnan Chen,Fan Fang,Hantao Chang
The inherent porous structure of Micro-arc oxidation (MAO) coatings may facilitate penetration of corrosive ions into the substrate, thereby compromising its corrosion resistance. In this work, the metal-organic framework (MOF) ZIF-8 was employed to seal the micropores in the MAO coating of titanium alloy (MAO-Ti) through a secondary growth method involved initially physically pre-loading crystal seeds into the micropores, followed by solvent thermal synthesis. Consequently, an excellent cohesive pore-sealing coating known as ZIF-8@MAO was successfully developed. The anchoring effect between ZIF-8 in the micropores and the substrate forms a solid blocking layer, which can effectively avoid the issue of traditional sealing layers detaching easily. Additionally, the arranged ZIF-8 crystals on the surface of MAO-Ti imparts excellent hydrophobicity and high stability to the alloy, evidenced by contact angle tests conducted under various solution environments, where the water contact angles (WCAs) exceeded 140°. Moreover, ZIF-8 microcrystals act as effective sealants for the micropores of MAO-Ti, effectively safeguarding the internal titanium alloy matrix against chloride ion infiltration and ensuring long-term corrosion resistance. Electrochemical tests assessing the corrosion resistance of the coatings revealed a significant improvement in the corrosion resistance of the ZIF-8@MAO pore-sealing coating compared to the primary MAO-Ti coating. The charge transfer resistance ( R ct ) increased from 2.05 × 10 4 Ω/cm 2 to 1.287 × 10 9 Ω/cm 2 , while the current density ( I corr ) declined from 2.03 × 10 −8 A/cm 2 to 2.65 × 10 −13 A/cm 2 .
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Wenling Wu,Xuan Zhang,Anding Shao,Gang Zhen,Yang Cheng,Xiangfei Wang,Jianfeng Zhu,Hongjie Luo
The corrosion of ancient bronze relics and protection measures after excavation are of great importance to the study of historical and cultural heritage. At present, the bionic superhydrophobic surface anticorrosive coating is one of the main anticorrosive measures of bronze cultural relics. It aims to construct a barrier to prevent the contact between corrosive media and bronze to reduce the invasion of corrosive media. However, due to structural defects such as micropores in a single organic coating, corrosive media (O2, Cl–, and H2O) can penetrate the coating to the metal matrix. Nanomaterials such as MXenes and metal–organic frameworks (MOFs) can fill structural defects such as microholes and microcracks of the coating, thereby improving the density of the coating. Therefore, to improve the performance of organic waterborne polyurethane (WPU) coatings with good chemical protection, nanomaterial ZIF-8/Ti3C2Tx was introduced based on the organic–inorganic hybrid theory. Finally, the coating was modified by 1H,1H,2H,2H-perfluorodecyltriethoxysilane, and the organic–inorganic composite coating was prepared. Characterizations of the composite coating were performed via Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer–Emmett–Teller method, field-emission scanning electron microscopy/energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Colorimetric measurements and reversibility experiments of the coating were also evidenced. According to the electrochemical impedance spectroscopy assessments, the |Z|0.01 Hz value of the F-WPU@ZIF-8/Ti3C2Tx composite coating in a 3.5 wt % NaCl solution, which was higher compared to other composite coatings. Moreover, the icorr value of the F-WPU@ZIF-8/Ti3C2Tx (3.344 × 10–6 A cm–2) composite coating is reduced by 2 orders of magnitude compared with F-WPU@ZIF-8 and F-WPU@Ti3C2Tx coatings. As a result, this organic–inorganic F-WPU@ZIF-8/Ti3C2Tx composite coating has good anticorrosion properties to bronze without causing an obvious color difference change and has potential application prospects in various metal material fields.
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