MOLECULES
·
2024
·Vol. 29
·期 8
·1703
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IF 4.2
Meihua Liang,Yong Yan,Jiaxuan Yang,Xiaodong Liu,Rongrong Jia,Yuanyuan Ge,Zhili Li,Lei Huang
Microelectromechanical systems (MEMS) gas sensors have numerous advantages such as compact size, low power consumption, ease of integration, etc., while encountering challenges in sensitivity and high resistance because of their low sintering temperature. This work utilizes the in situ growth of Zeolitic Imidazolate Framework-8 (ZIF-8) followed by its conversion to N-doped ZnO. The results obtained from scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicate that the in situ derivation of ZIF-8 facilitates the adhesion of ZnO particles, forming an island-like structure and significantly reducing the interfaces between these particles. Furthermore, powder X-ray diffraction (XRD) analysis, elemental mapping, and X-ray photoelectron spectroscopy (XPS) analysis confirm the conversion of ZIF-8 to ZnO, the successful incorporation of N atoms into the ZnO lattice, and the creation of more oxygen vacancies. The ZIF-8-derived N-doped ZnO/MEMS sensor (ZIF (3)-ZnO/MEMS) exhibits remarkable gas sensitivity for ethanol detection. At an operating temperature of 290 °C, it delivers a substantial response value of 80 towards 25 ppm ethanol, a 13-fold enhancement compared with pristine ZnO/MEMS sensors. The sensor also exhibits an ultra-low theoretical detection limit of 11.5 ppb to ethanol, showcasing its excellent selectivity. The enhanced performance is attributed to the incorporation of N-doped ZnO, which generates abundant oxygen vacancies on the sensor’s surface, leading to enhanced interaction with ethanol molecules. Additionally, a substantial two-order-of-magnitude decrease in the resistance of the gas-sensitive film is observed. Overall, this study provides valuable insights into the design and fabrication strategies applicable to high-performance MEMS gas sensors in a broader range of gas sensing.
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高影响因子
Small
·
2024
·
IF 13
Hongtao Zhang,Shiguo Yuan,Boyuan Zheng,Peng Wu,Xiuming He,Yi Zhao,Zhangfeng Zhong,Xiaofang Zhang,Jian Guan,Huajun Wang,Lei Yang,Xiaofei Zheng
Osteoarthritis (OA) is a progressively developing condition primarily characterized by the deterioration of articular cartilage and the proliferation of bone, along with ongoing inflammation. Although the precise pathogenesis remains somewhat elusive, restoring the homeostatic balance of the intra-articular microenvironment is crucial for the management of OA. Intra-articular injection of medication is one of the most direct and effective treatment methods; however, most injectable drugs used for osteoarthritis treatment, due to their rapid breakdown, quick release, poor biological activity, and frequent injections, leading to increased risk of infection and suboptimal therapeutic outcomes. In this study, a lubricating and dual-responsive injectable hydrogel based on zeolitic imidazolate frameworks-8 (ZIF-8) impregnated with Quercetin (Que) is designed, which can facilitate OA treatment by remodeling the microenvironment. The prepared injectable nanocomposite hydrogel (MH/CCM@ZIF-8@Que) exhibits pH and reactive oxygen species (ROS) responsiveness, alongside a controllable release of bioactive substances to modulate the microenvironment of bone tissue, thereby mitigating synovitis and the degeneration of cartilage matrix, while simultaneously facilitating cartilage repair. This developed thermosensitive injectable hydrogel, which effectively balances lubrication with the controlled release of bioactive substances, represents a highly promising therapeutic approach for osteoarthritis.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Qing Li,Jie Sheng,Wen-Qing Fei,Chun-Miao Zhang,Zhang-Hong Wan,Xin Wu,Xue-Fei Sun
Metal-organic framework (MOF)-derived catalysts have received growing attention as promising materials for wastewater decontamination . However, the practical use of these catalysts still encounters many challenges, such as poor separation from the reaction mixture, sub-ideal catalytic performance of monometallic MOFs, and large consumption of organic solvents in the preparation process. To address these issues, we adopted a “seed-growth epitaxial” strategy, substituting MeOH with the green solvent H 2 O to synthesize an environmentally friendly leaf-like vine-weaved fiber membrane, composed of two-dimensional bimetallic zeolitic imidazolate framework (ZnCo-ZIF) and polyacrylonitrile (PAN), which was utilized to activate peroxymonosulfate (PMS) for the degradation of norfloxacin (NOR). The ZnCo-ZIF/PAN fiber membrane possesses a substantial specific surface area , facilitating the uniform and efficient exposure of bimetallic active sites. The results showed that ZnCo-ZIF/PAN was highly efficient in PMS activation, achieving a 93 % NOR removal within 120 min. The removal efficiency of NOR increased in accordance with doped Co. The catalyst demonstrated relatively high activity in the pH range of 3.0∼7.0. The radicals quenching experiments proved that SO 4 · − and ·OH were the crucial reactive oxygen species (ROS), which confirmed by electron paramagnetic resonance spectroscopy (EPR). The degradation pathways were proposed according to the intermediates identified by high-performance liquid chromatography-coupled mass spectrometry , including dehydrogenation , defluorination , hydroxylation , piperazinyl ring transformation, and quinolone group transformation. Importantly, the flexible ZnCo-ZIF/PAN composite nanofiber membrane can be separated 100 % from treated wastewater to solve the recycling and reuse problem of nanopowders . This study provides a new perspective for the design of bimetallic ZIF composite fibers with excellent catalytic properties and offers new ideas for their application in practical production.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lipeng Wu,Xiaomin Wang,Pengwei Zhao,Yongsheng Ji,Bin Li,Yongsheng Xu,Tao Liao,Qing Xia,Yang Li,Xiaobin Fan,Wenchao Peng
Atomic Zn-N-C materials are synthesized by direct carbonization of ZIF-8, which maintains the rhombic dodecahedron morphology (RDM) with abundant nanopores. Zn-N-C-RDM shows enhanced catalytic activity with bisphenol A (BPA) as model pollutant and peroxydisulfate (PDS) as oxidant. Molecular dynamic (MD) calculations show that mean square displacement (MSD) of PDS, BPA, and H 2 O molecules in the nanotunnels decreases obviously with smaller pore size. Due to the confinement, the BPA ( d i = 1.0 nm) and PDS ( d i = 0.5 nm) can easily enter and confined in the cavities of Zn-N-C-RDM. PDS can be therefore activated more easily to degrade BPA due to their faster diffusion and shorter transfer routes. > 97 % degradation of BPA can therefore be achieved by Zn-N-C-RDM within 20 min. Quenching experiments, electron paramagnetic resonance (EPR) and open circuit potential (OCP) results indicate that O 2 •− radical dominate the degradation. According to the density functional theory (DFT) results, the binding sites of Zn-pyridinic N are the main active sites. This work provides new insights for improving activity in Fenton-like reactions in the field of environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Danqiang Huang,Xiangyun Zhang,Jianfeng Dai,Zizhou Yuan
The rapid advancement of wireless communications, radar systems, and electronic devices has resulted in a substantial increase in electromagnetic interference (EMI), which poses a threat to electronic device performance and human health. This study addresses the urgent need for lightweight materials with strong absorption capacities, wide absorption bandwidths, and low thickness values. For this purpose, ZIF-67-derived C/Co nanofibers were synthesized via electrospinning, dipping, and high-temperature carbonization. Co 2+ ions were pre-anchored and encapsulated in polyacrylonitrile (PAN) fibers and are grown by immersion in an organic ligand. Utilizing 0.4 g of cobalt nitrate hexahydrate, the amount of encapsulated Co 2+ was optimized to provide the greatest electromagnetic wave absorption performance. Under these conditions, the reflection loss was −49.45 dB, and the maximum effective absorption bandwidth was 6.48 GHz, thereby covering the entire Ku band. The composite material demonstrated a significant improvement in impedance matching and electromagnetic wave dissipation, which was attributed to the uniform dispersion of Co particles and the formation of multi-component heterogeneous interfaces. This study presents a pragmatic method for creating high-performance materials that could potentially reduce electromagnetic interference (EMI) in the aerospace, telecommunications, and defense sectors.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Yan Wang,Bo Ding,Qingqing Bao,Yunying Zhao,Guohui Li,Yu Deng
Agmatine is an important basic drug and nutritional supplements, which exhibits significant physiological activities. Traditional methods, such as whole-cell catalysis, require substantial pyridoxal 5′-phosphate (PLP) addition, which accounts for 15 % of production costs. In this study, we utilized purified arginine decarboxylase (AdiA-M2) that leverages the intrinsic PLP cofactor, without the need for additional PLP supplementation, and ZIF-8 was employed to enhance the pH tolerance. The successful incorporation of AdiA-M2 into the ZIF-8 structure was confirmed through scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The immobilized arginine decarboxylase demonstrated markedly enhanced performance under alkaline conditions, along with improved thermal stability and storage activity compared to its free enzyme counterpart. Specifically, the immobilized AdiA@ZIF-8 system achieved an initial conversion rate of 95.16 %, after five recycles the titer attained 266.69 g/L without the extra PLP addition, which is 1.67 times higher than the best current production approach. The adopted enzyme-catalysis system eliminated the need for additional cofactors, thereby lowering costs and providing valuable insights for the industrial production of agmatine.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Naipu He,Wen Li,Tingting Shi,Zongjie Li,Fengchuan Guo,Zongxin Li,Xuerui Zhao
ZIF-8@chitosan (CS)/polyvinylpyrrolidone (PVP) hydrogels (CPxHGZ) were fabricated by in situ growth of metal–organic framework (MOF) crystals on the network of CS/PVP semi-interpenetrating hydrogels. The ZIF-8 crystals were assembled in the channel of hydrogel and coated by networks of hydrogel. Morphology and distribution of the ZIF-8 crystals in CS/PVP hydrogels were modulated by the polymer network of hydrogels. PVP played a key role in guiding the growth of ZIF-8 crystals and preventing aggregation of ZIF-8 crystals in the network of CS/PVP hydrogel. Additionally, the PVP content in hydrogels influencing the adsorption capacity of CPxHGZ for CO2 was explored. With increasing PVP content in the hydrogels, the equilibrium adsorption of CPxHGZ for CO2 was increased. Especially, the equilibrium adsorption of CP10HGZ for CO2 was increased by 22%, which was higher than that of the pure ZIF-8 crystals. The results of kinetic simulation, XRD spectra, and FT-IR spectra revealed that the adsorption mechanism of CPxHGZ for CO2 was mainly chemisorption. The presence of multisites, including the amine groups in CS and PVP as well as metals in ZIF-8, was beneficial for enhancing the adsorption capacity of CPxHGZ for CO2.
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PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Bo Fang,Jie Xie,Dazhao Yu,Xinyue Zhang,Chaojie Jing,Hui Guo,Yuzhu Li,Wenzuo Li,Jie Liu
The hydrophilic benzimidazole@ZIF-8@tannic acid (ZBT) nanoparticles and the pH-responsive modified epoxy (EP) coatings based on ZBT were prepared innovatively. The result exhibited that the ZBT had excellent compatibility with the EP coatings, and the addition of ZBT improved the protective properties of the EP coatings, which were attributed to the formation of the Zn(OH) 2 deposition film, the inhibitor adsorption film and the ferric tannate film on the steel substrate. Meanwhile, the original adhesion and wet adhesion strengths of the ZBT/EP coatings were both enhanced, which was mainly attributed to the enhanced interaction between the ZBT/EP coatings and the carbon steel, and the crosslinking density and the degree of curing of the coatings were also improved. After 173 days of immersion, the impedance value of the ZBT coatings remained at 7.89 × 10 7 Ω·cm 2 , while the EP coatings decreased to 3.94 × 10 3 Ω·cm 2 . The wet adhesion loss of EP and ZBT/EP coatings was 63.6 % and 27.1 %, respectively. In the end, the protective mechanism of the ZBT/EP coatings was first proposed.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Puyue Liu,Yiming Dong,Xiaoxuan Li,Yu Zhang,Zhi Liu,Yingying Lu,Xuewen Peng,Ruifang Zhai,Yiping Chen
The misuse and overuse of chloramphenicol poses severe threats to food safety and human health. In this work, we developed a magnetic solid-phase extraction (MSPE) pretreatment material coated with a multilayered metal – organic framework (MOF), Fe 3 O 4 @ (ZIF-8) 3 , for the separation and enrichment of chloramphenicol from fish. Furthermore, we designed an artificial-intelligence-enhanced single microsphere immunosensor. The inherent ultra-high porosity of the MOF and the multilayer assembly strategy allowed for efficient chloramphenicol enrichment (4.51 mg/g within 20 min). Notably, Fe 3 O 4 @ (ZIF-8) 3 exhibits a 39.20% increase in adsorption capacity compared to Fe 3 O 4 @ZIF-8. Leveraging the remarkable decoding abilities of artificial intelligence, we achieved the highly sensitive detection of chloramphenicol using a straightforward procedure without the need for specialized equipment, obtaining a notably low detection limit of 46.42 pM. Furthermore, the assay was successfully employed to detect chloramphenicol in fish samples with high accuracy. The developed immunosensor offers a robust point-of-care testing tool for safeguarding food safety and public health.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhaochuan Yu,Chao Deng,Chenhui Ding,Xing Zhang,Yuqian Liu,Chao Liu,Zhichao Lou,Farzad Seidi,Jingquan Han,Qiang Yong,Huining Xiao
Despite the tremendous efforts on developing antibacterial wearable textile materials containing Ti 3 C 2 T x MXene, the singular antimicrobial mechanism, poor antibacterial durability, and oxidation susceptibility of MXene limits their applications. In this context, flexible multifunctional cellulosic textiles were prepared via layer-by-layer assembly of MXene and the in-situ synthesis of zeolitic imidazolate framework-8 (ZIF-8). Specifically, the introduction of highly conductive MXene enhanced the interface interactions between the ZIF-8 layer and cellulose fibers, endowing the green-based materials with outstanding synergistic photothermal/photodynamic therapy (PTT/PDT) activity and adjustable electromagnetic interference (EMI) shielding performance. In-situ polymerization formed a MXene/ZIF-8 bilayer structure, promoting the generation of reactive oxygen species (ROS) while protecting MXene from oxidation. The as-prepared smart textile exhibited excellent bactericidal efficacy of >99.99 % against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) after 5 min of NIR (300 mW cm −2 ) irradiation which is below the maximum permissible exposure (MPE) limit. The sustained released Zn 2+ from the ZIF-8 layer achieved a bactericidal efficiency of over 99.99 % within 48 h without NIR light. Furthermore, this smart textile also demonstrated remarkable EMI shielding efficiency (47.7 dB). Clearly, this study provides an elaborate strategy for designing and constructing multifunctional cellulose-based materials for a variety of applications.
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高影响因子
Catalysts
·
2018
·Vol. 8
·期 3
·96
·
IF 3.465
Miaad Adnan,Kai Li,Li Xu,Yunjun Yan
This study presents a one-step encapsulation method for synthesizing X-shaped zeolitic imidazolate frameworks (ZIF-8) and immobilizingRhizomucor mieheilipase (RML). We proved that the morphological structure of ZIF-8 had changed after immobilization with enhanced characterization using a field-emission scanning electron microscope, an energy-dispersive spectrometer, a transmission electron microscope, a Fourier transform infrared spectrometer, and powder X-ray diffraction. The surface area and pore size of the carrier were investigated before and after immobilization using Brunauer–Emmett–Teller and Barrett–Joyner–Halenda methods, respectively. RML@ZIF-8 exhibited high recovery activity of up to 2632%, representing a 26-fold increase in its free lipase. Encapsulated RML was used for biodiesel production from soybean oil in an isooctane system with a conversion yield of 95.6% under optimum conditions. The resulting reusability of the immobilized enzyme indicated no substantial decline in the conversion yield, which remained at 84.7% of the initial activity after 10 cycles. The stability and high performance of the immobilized enzyme are attributed to the harmony between RML and ZIF-8 based on the easy synthesis of ZIF-8 and the short time required to immobilize RML.Keywords:X-shape ZIF-8;Rhizomucor mieheilipase (RML);encapsulation technique;biodiesel yield;soybean oil
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xiaolong Han,Tingting Hu,Ye Wang,Huiyong Chen,Yuqi Wang,Ruiqing Yao,Xiaoxun Ma,Jiding Li,Xifei Li
In this article, ZIF-8 nanoparticles were synthesized in water and directly added to a polyethyleneglycol (PEG) aqueous solution (water-based mixing process) to prepare ZIF-8/PEG mixed matrix membranes (MMMs) for pervaporation desulfurization. The structure and properties of ZIF-8 particles were characterized by Fourier Transform-Infrared Spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and BET analysis. The surface composition and structural morphology of all ZIF-8/PEG MMMs were systematically investigated by FT-IR and SEM. The effect of ZIF-8 content on the pervaporation performance of ZIF-8/PEG membranes was investigated. Versus pure PEG membranes, both the total flux and the sulfur enrichment factor of the ZIF-8/PEG MMMs were remarkably increased. This phenomenon is attributed to the good compatibility between PEG and ZIF-8 particles and the high thiophene selective sorption of ZIF-8 particles (confirmed by molecular simulation). Optimal pervaporation performance was achieved at a 4 wt% loading of ZIF-8 particles with the flux of 1.96 kg/(m 2 h) and the sulfur enrichment factor of 8.93. These increased by 397.46% and 18.75% versus pristine PEG membrane, respectively. In addition, the effect of operation temperature and feed sulfur content on membrane performance were also systematically investigated.
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