FUEL PROCESSING TECHNOLOGY
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2023
·
IF 7.5
Qiang Le,Zan Liu,Zhilin Cheng
In this work, a novel core-shell nanostructured coaxial nanofiber membranes (CFMs) were successfully produced by the coaxial electrospinning . The structure and composition of CFMs were probed by a series of characterizations. The results demonstrated that the CFMs were comprised of the versatile core-shell structure nanofibers, therein Cu(I)/UIO-66 scattered in the shell layer and HNTs dispersed in the core layer. As applied in the selective adsorption desulfurization , the Cu(I)/UIO-66 embedded on the surface of the nanofiber undertook the adsorption active sites, while HNTs in core layer served as enhancing the mechanical performance of PAN nanofibers. The CFMs had the superior adsorption performance in the batch adsorption (maximum:40.14 mg·g −1 ) and fixed-bed adsorption (maximum: 47.43 mg·g −1 ) capacities for benzothiophene (BT) from fuel oil, respectively. Furthermore, due to having the robust mechanical performance, the CFMs exhibited the preferable recycling adsorption and mechanical stability . The adsorption mechanism of BT molecules on CFMs was explored by the kinetics, isotherms and thermodynamic models , indicating the existence of the synergistic effect of physical adsorption and chemical adsorption.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 9
·3913-3920
·
IF 3.069
Mengxin Zhang,Meishan Li,Wangui Wu,Junkun Chen,Xiuling Ma,Zhangjing Zhang,Shengchang Xiang
In this work, ZIF-67 decorated with polyacrylonitrile (PAN) was electrospun to obtain composite ZIF-67/PAN nanofibers, which were used to construct C-ZIF-67/PAN-800 via one-step pyrolysis at 800 °C under a N2 atmosphere. Then, a strategy for constructing a sensor for the simultaneous determination of hydroquinone (HQ) and catechol (CC) was proposed using a C-ZIF-67/PAN-800-modified glass carbon electrode (GCE). Additionally, C-ZIF-67-800 was fabricated as a reference through the pyrolysis of ZIF-67 in the absence of PAN at 800 °C. C-ZIF-67/PAN-800/GCE showed much better electrochemical activity for the simultaneous determination of HQ and CC than C-ZIF-67-800/GCE. Under optimal conditions, C-ZIF-67/PAN-800/GCE exhibited a wide detection range of 1–120 μM and 1–200 μM for HQ and CC, respectively, and both detection limits were 1.0 μM. Our work proves that the electrochemical properties of MOF-derived porous carbon materials can be tuned by electrospinning.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yifei Zhan,Jianwu Lan,Jiaojiao Shang,Lin Yang,Xinmei Guan,Wenxu Li,Siqi Chen,Ying Qi,Shaojian Lin
A ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat was successfully fabricated via stepwise in-situ growth method. The morphology and composition of the resultant ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat were confirmed by emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS), respectively. Next, methylene blue (MB) was employed as a contaminant to evaluate photocatalytic activity of prepared composite photocatalysts under visible light and natural sunlight irradiation. As expected, the ZIF-8/Ag/AgCl/TiO 2 decorated PAN nanofibrous mat exhibited high photocatalytic activity under both light sources, owing to the synergistic effect among ZIF-8, Ag/AgCl and TiO 2 . The degradation efficiency of the targeted PAN nanofibrous mat under visible light could reach to 98.02% within 120 min towards 20 mL of 50 mg/L MB aqueous solution. Most importantly, the fabricated ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat exhibited outstanding recyclability, the corresponding degradation efficiencies were up to 90.16% after five cycles and approximately 80% after ten cycles, respectively. Additionally, the resultant nanofibrous mat showed a long-term stability against acid and alkaline, and excellent antimicrobial performance against S. aureus and E. coli .
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 25
·3550-3558
·
IF 3.304
Fang Tang,Meizhu Zhang,Zhongbo Li,Zhaofang Du,Bensong Chen,Xuan He,Siyu Zhao
Surface-enhanced Raman scattering (SERS) is one of the most promising methods in detecting trace amounts of molecules owing to its high sensitivity, fast response, and high molecular specificity. One of the key issues for SERS applications is to fabricate highly sensitive and homogeneous SERS substrates. Here, we present a template-assisted synthetic approach to fabricate urchin-like Ag-nanoparticle (Ag-NP) decorated ZnO-nanorods grafted on hexagonally ordered polyacrylonitrile (PAN) nanopillar arrays as flexible and reliable surface-enhanced Raman scattering (SERS) substrates, which are achieved by a combined process of molding highly ordered PAN-nanopillar array films, electrochemical depositing ZnO nanorods onto molded PAN nanopillar arrays, then sputtering Ag-NPs onto the surface of ZnO nanorods. The resultant hetero-hierarchical nanostructure exhibits not only much stronger SERS activity but also uniform SERS signals over the whole arrays based on the high density of nanogaps (hot spots) between the neighboring Ag-NPs on both the same ZnO-nanorods and adjacent ZnO-nanorods and the highly ordered PAN-nanopillar arrays. Using the Ag-NP assembled ZnO-nanorod arrays as SERS-substrates, not only 10−13 M Rhodamine 6G has been identified, but also 10−8 M parathion-methyl has been recognized, showing great potential in detection of trace organic pollutants in the environment. Furthermore, the Ag-NPs@ZnO-nanorods could achieve self-cleaning and reactivation of SERS-activity by simple UV light irradiation and retain stable SERS sensitivity even after five cycles, demonstrating the high reusability of the hybrid substrates.
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POLYMER COMPOSITES
·
2018
·
IF 1.943
Bin Wang,Yue Ma,Bing Na,Ruihua Lv,Hesheng Liu,Weiping Li,Haiying Zhou
Polymer film capacitors with high stability and reliability at elevated temperatures are promising for next-generation power electronic systems and hybrid electric vehicles. In this work, sandwich-structured composite films with good dielectric thermal stability were fabricated based on hybrid membranes of poly(vinylidene fluoride)/polyacrylonitrile blend nanofibrous skeleton highly filled with BaTiO 3 nanoparticles. Composite films with 64.7 vol% BaTiO 3 nanoparticles in the core layer exhibited high permittivity (38.1) and low loss (0.046) at 1 kHz and room temperature, and the dielectric permittivity and loss were only slightly increased to 41.5 and 0.08, respectively, at 120°C. Good dispersion and high loading of BaTiO 3 nanoparticles in the composites films contributed to enhanced dielectric thermal stability and permittivity. Moreover, the composite films showed good flexibility, which could be ascribed to its sandwich-structure. Our work paves a generic way to fabricate flexible composite films with excellent dielectric thermal stability via high loadings of ceramic nanoparticles. POLYM. COMPOS., 39:E1841–E1848, 2018. © 2018 Society of Plastics Engineers
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REACTIVE & FUNCTIONAL POLYMERS
·
2013
·
IF 2.505
Shi Dongjian,Sui Jing,Duan Fang,Chen Mingqing,He Bingxiao
Thermal-sensitive poly( N , N -diethylacrylamide) grafted poly(acrylonitrile/styrene) (PDEAm- g -PAN/PSt) polymeric microspheres were prepared from PDEAm macromonomer, St and AN by dispersion copolymerization . The polymeric microspheres had raspberry-like morphology with large surface area. Palladium–metal (Pd–M) (M: copper, Cu, silver , Ag) bimetallic nanoparticles were stabilized on the surface of the PDEAm- g -PAN/PSt microspheres via the coordinate interaction between amide groups in PDEAm and metal ions with the reduction of the corresponding ions. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetry analysis (TGA) results confirmed the size and composition of the immobilized Pd–M nanoparticles. The Pd–M bimetallic nanoparticles showed superior catalytic efficiencies for the reduction of 4-nitrophenol (4-NP) than the monometallic nanoparticles. The catalytic activity of the Pd–M bimetallic catalysts could be controlled by the molar ratio of Pd and M ions and composition of Pd–M nanoparticles. Moreover, the catalytic property of the Pd–M nanoparticles could be regulated by temperature and increased with increasing the temperature above lower critical solution temperature (LCST). Furthermore, the Pd–M nanoparticles could be easily recycled and reused to catalyze 4-NP for five times without loss of activity. These bimetallic nanoparticles possess great potential in future practical application in catalytic technology.
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DESALINATION
·
2024
·
IF 8.3
Tian Gao,Ping Fu,Wan-Long Li,Wan-Ting Lin,Yuan-Hui Yu,Xiao-Jun Huang,Zhi-Kang Xu,Ling-Shu Wan
Nanofiltration (NF) membranes with superior permeability and selectivity are highly desirable for the applications. The development of non-polyamide loose NF membranes with high permeability and dye/salt selectivity has aroused great attention in recent years. In this work, 2-hydroxy-1,4-naphthoquinone, a natural compound commonly existed in plants, was chosen to prepare loose NF membranes via the co -deposition with polyethyleneimine (PEI). By optimizing the deposition conditions, we successfully fabricated amine-quinone network coatings on the surface of polyacrylonitrile (PAN) ultrafiltration membranes, and further cross-linked the coatings with glutaraldehyde to improve the compactness and stability. For this kind of loose NF membrane, the rejections to dyes with a molecular weight larger than 600 Da reach 98 %, and the water permeance keeps above 10 L·m −2 ·h −1 ·bar −1 . In contrast, the rejections to inorganic salts (NaCl, Na 2 SO 4 , MgCl 2 , and MgSO 4 ) are only about 10 %, and the selectivity of the dye molecule alcian blue against NaCl can reach 430. These results prove that this novel composite membrane can realize effective separation for dyes with different molecular weights and desalination for dye solutions. The present work will open up an avenue for designing loose NF membranes with novel separation layers.
研究领域:
膜科学
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材料科学
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环境工程
·
化学工程
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CELLULOSE
·
2022
·Vol. 29
·期 7
·3817-3827
·
IF 6.123
Yang Yinzhi,Gao Min,Wu Yuyang,Liu Zheng,Xie Jinpeng,Deng Zhongmin,Cai Guangming,Cao Xinwang,Ke Wei
In this study, polyacrylonitrile (PAN) @ bamboo shoot shell cellulose nanowhisker (BSCN) @ carbon nanotube (CNT) electrospun composite membrane with enhanced dye adsorption performance was prepared. Methyl blue (MB) was used for dye experiment. The results showed that with the increase of BSCNs, the diameter of the nanofibers in composite membranes gradually increased. When 1.2% BSCNs was added, the removal rate of methylene blue is up to 92.56%, and the kinetics was also investigated. The prepared different composite membranes were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermal gravimetric analysis (TGA) to investigate the surface morphology of fabricated structures, functional groups on the surface of nanofibers and thermal properties. The prepared TEMPO oxidized BSCN based composite membranes can be used as an excellent substrate in the elimination of methylene blue, which is promising in the development of environment-friendly water purifying materials.
研究领域:
材料科学
·
环境科学
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COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Mingyao Dai,Bodu Fang,Lichao Zou,Siwen Deng,Hao Ren,Yalan Li,Jiabin Chen,Shulong Zeng,Shaohong Shi,Fangchao Cheng
With the rapid development of 5G communication technology, the surge in the number of antenna modules for intelligent terminal equipment has led to the intensification of electromagnetic radiation and interference problems, posing a major threat to electronic equipment safety, information systems stability, and human health. Traditional electromagnetic shielding materials have made it difficult to meet the demand for intelligent, integrated electronics. In this study, we proposed an in-situ sedimentation strategy to fabricate flexible polyacrylonitrile/graphene@multi-walled carbon nanotubes (PAN/Gr@MWCNTs) composite film with hierarchical double-layered structures, thus realizing ultra-thin, highly conductive, and excellent electromagnetic shielding and Joule heating properties. Particularly, the as-formed hierarchical film possessed an ultra-thin thickness of 0.158 mm and a high conductivity of 1660.26 S/m, simultaneously accompanied by an electromagnetic interference shielding efficiency (EMI SE) of 42.82 dB and a specific shielding efficiency (SSE) of 271.01 dB/mm. In addition, the film exhibited excellent Joule heating capability in the voltage range of 1.50–2.25 V. This study provides innovative ideas for developing flexible electromagnetic shielding films, which are of great scientific significance and potential application in electromagnetic radiation protection.
研究领域:
材料科学
·
电子工程
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Xiangyu Wang,Weihong Su,Ping Ning,Iseult Lynch
To address the challenges posed by both the inherent limitations including aggregation and passivation of nano zero-valent iron (nZVI) and the treatment of acidic chromium-containing wastewater under mild conditions, a three-dimensional sulfonated covalent organic framework (SCOF) polyacrylonitrile (PAN) blended membrane loaded with nZVI (Fe 0 /SCOF-PAN) was fabricated via a green steam-assisted multiphase blending method combined with freeze-drying. Innovatively, SCOF was introduced into the PAN matrix to achieve dual modification, where the electrostatic repulsion provided by sulfonic acid groups significantly improved the dispersion of nZVI. Additionally, the membrane structure created acidic microenvironment within its cavities, effectively mitigating nZVI passivation. Experimental results demonstrated that the Fe 0 /SCOF-PAN composite exhibits excellent nZVI loading capacity and high Cr(VI) removal performance. Compared with unmodified PAN-supported nZVI, the Cr(VI) removal efficiency increased by 33.8%, and the loading capacity improved by 21.9 mg/g, while the removal efficiency remained above 90% in actual wastewater. Based on pseudo-first-order kinetics modeling, Sips isotherm analysis, thermodynamic studies, and XPS characterization, the high removal efficiency of Fe 0 /SCOF-PAN was attributed primarily to the redox reactions involving nZVI and its derived Fe 2+ species, supplemented by the active sites and functional groups of SCOF, which contributed through electrostatic attraction and chelation. This study presents a low-energy strategy for synthesizing SCOF-PAN blended membranes, offering a novel approach for designing high-performance nZVI supported materials and advancing the treatment of acidic chromium-laden industrial wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yongman Liu,Xueyi Zhou,Haoxin Li,Wenjing Zhang,Yubin Wang,Junjie Li,Shangquan Wu,Shuo Feng
A porous crimped TPU/PAN-MXene sensor was prepared via electrospinning. • High sensitivity, wide strain range and excellent mechanical properties are achieved. • It monitors multiple human activities and recognizes various complex gestures. • Combined with 3D-DIC, the sensor realizes dynamic full-field strain mapping. Flexible wearable strain sensors offer high comfort and sensitivity, making them increasingly important for health monitoring and human–computer interaction. However, conventional sensors only measure average strain via electrical signal changes, lacking the ability to capture key deformation features — such as strain direction, spatial distribution, and temporal evolution — during complex human motion. Here, we developed a porous crimped nanofibrous membranes sensor via electrospinning and ultrasonication, using a composite of thermoplastic polyurethane (TPU), polyacrylonitrile (PAN), and MXene. The sensor possesses high sensitivity (gauge factor > 4974 at high strain), a wide detection range (0%–550%), exceptional tensile strength (6.8 MPa), durability (elongation at break: 1488%), and excellent stability (1800 cycles). Moreover, the sensor demonstrated excellent performance in monitoring a range of physiological activities, such as flexion of finger, elbow, wrist and knee, as well as vocalization and swallowing. Assisted by machine learning, it enables precise recognition of various complex gestures. More importantly, by integrating the sensor with digital image correlation, we dynamically captured full-field displacement and strain during human motion, revealing the spatial distribution and dynamic propagation characteristics of strain. This study offers insights for optimizing flexible sensor structures by visualizing the full-field strain evolution, and paves the way for advanced applications in wearable electronics and biomechanical monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Fei Zhan,Chuanwei Zhou,Fengjian Yang,Changsheng Liu,Lili Sun,Yuan Yuan
UPG-PAN integrates self-lubrication, wet adhesion, and fatigue resistance. • UPG-2 achieved 3.22 MPa strength and 92.5% fatigue resistance. • Glycerol migration lowered contact angle to 28° and friction to 0.035. • PAN-2 provided 27.53 kPa wet adhesion to subchondral bone. • UPG-PAN showed good cytocompatibility and milder early tissue response. Articular cartilage remains a significant clinical challenge. The ideal implant would support joint loads, resist fatigue, reduce friction, adhere to wet subchondral bone and demonstrate good biocompatibility. Although hydrogels have a hydration profile similar to that of cartilage, many lack long-term durability under load. Elastomers have higher mechanical strength, but they often show poor surface lubrication and weak wet-tissue adhesion. In this study, we developed a biomimetic bilayer elastomeric cartilage substitute, named UPG-PAN. It contains a self-lubricating upper elastomer layer, UPG, and a wet-adhesive lower hydrogel layer, PAN. In the UPG layer, thermoplastic polyurethane (TPU) forms the elastic load-bearing framework. Poly(ethylene glycol)-modified poly(glycerol sebacate) (PEGS) and glycerol (Gly) regulate chain entanglement, reversible hydrogen bonding, surface hydration, and energy dissipation. The UPG-2 elastomers maintained MPa-level compressive strength (∼3.22 MPa), tunable modulus (∼1.58 MPa), stable cyclic compression behavior, and good fatigue resistance (∼92.5%). Gly migrated toward the material surface during formation and drying. This migration formed an OH-rich hydrated lubricating layer. The layer improved surface wettability and helped maintain low friction during reciprocating sliding (∼0.035 COF). The PAN layer was prepared by photocuring PEGS-Ac, PEGS-NH 2 , and acrylic acid (AAc). This layer formed a continuous UPG-PAN interface and strong wet adhesion to bone (∼27.53 kPa). The adhesion was related to interfacial chain interpenetration, hydrogen bonding, crosslinking, and electrostatic interactions. L929 cell culture and rat subcutaneous implantation showed good biological safety. Compared with TPU-PAN, UPG-PAN showed improved cytocompatibility and a milder early inflammatory response. Overall, UPG-PAN combines fatigue-resistant mechanical support, self-lubrication, wet fixation, and biocompatibility. This bilayer design may help slow local cartilage degeneration and delay invasive joint replacement in patients with focal cartilage defects.
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