JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Xue Gao,Zhong-Kun Li,Jian Xue,Yong Qian,Li-Zhi Zhang,Jürgen Caro,Haihui Wang
Highly effective air filters are needed because of the increasing harm caused by air particulate matter pollution. Herein, two-dimensional titanium carbide Ti 3 C 2 T x MXene nanosheets with active surface-terminating groups (O, OH and F) were used to modify the polyacrylonitrile (PAN) nanofiber filters to strengthen their interaction force with PM2.5 . These forces were measured quantitatively through the force-distance curve-based AFM showing that the MXene modification of the PAN fiber induces three times larger interaction forces than before. The obtained filters show high PM2.5 removal efficiency of ∼99.7% with a low pressure drop of ∼42 Pa. Moreover, the presence of MXene nanosheets strongly inhibits the propagation of bacteria (e.g. E. coli and S. aureus ) in the filters. Such filters can significantly improve air quality, especially in public places such as hospitals.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 4
·1-16
·
IF 3.061
Guo Hui,Zhang Dong,Jiang Lanying
In this work, nanofibrous membranes for separating oil-in-water (O/W) emulsion were prepared by electrospinning. The membrane material was polymer blend of polyacrylonitrile (PAN)/polyvinyl alcohol (PVA), and by adjusting polymer composition and concentration, as well as applying crosslinking by glutaraldehyde (GD ) and hydrolysis inside NaOH solution, membrane with desired properties, particularly hydrophilicity and underwater oil repellency were obtained. For PAN/PVA composite membrane modified by glutaraldehyde for 1.5 h and NaOH for 1.5 h, the water contact angle initially was around 5° and decreased to 0 o with a transition time of only 0.3 s. The membrane also showed recommendable performance in O/W emulsion separation. Under a driving force of 0.8 kPa, the highest starting flux of 953 L/m 2 h and 532 L/m 2 h were registered with the treatment of surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE), respectively. The membrane recovered 96% of its initial flux in a 5-cycle reusability test using SFE, and the oil rejection coefficient maintained higher than 97%. FTIR and XPS characterizations confirmed the success in chemical modifications. It was also found that glutaraldehyde crosslinking helped to improve the macroscopic structure integrity of the membrane in aqueous environment.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Qijian Niu,Xiaolei Zhu,Yunhui Tang,Jun Nie,Guiping Ma
Different from the traditional method for fabricating core-shell structure nanofiber, the PAN/PDMS nanofibers with core-shell structure (PAN as the core layer and PDMS as the shell layer) have been illustrated, which combines with the synchronous photopolymerization during emulsion electrospinning process. The morphology and structure of as-fabricated PAN/PDMS nanofibers are characterized by SEM and TEM. The composition of PAN/PDMS nanofibers is characterized by FTIR, XPS, TG, and DTG, successfully. The photopolymerization process is characterized by UV–vis spectroscopy indirectly. The WCA tests show that it has good hydrophobicity, which makes it possible as functional material. Meanwhile, the most important thing is that the method provides a flexible design strategy of core-shell structure nanofibers.
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Chenyang Xu,Li Zhong,Cui Liu,Nian Li,Shudong Zhang,Zhenyang Wang,Min Xi
The heat release of ambient temperature objects (0–100 °C) is often in the form of mid- to far-infrared radiation outward (∼4000 to 200 cm–1). In order to maintain warm objects, it is theoretically feasible to construct a kind of flexible material with infrared reflection ability targeting the band of mid- to far-infrared. In this paper, we proposed a type of nanofiber mat with excellent infrared reflection and thermal insulation performance. The ITO nanoclusters were introduced into the polyacrylonitrile (PAN) nanofibers via the electrospinning technique. The performed experimental test proved that the infrared reflection ability of the nanofiber mat can be enhanced because of the increased diameter of nanofiber upon the introduction of the ITO nanocluster as well as the localized surface plasmon resonance (LSPR) effects of ITO nanoclusters in the mid- to far-infrared range. It worth mentioning that the prepared nanofiber mat showed good air-permeability and mechanical properties due to the PAN matrix. Moreover, the performed experiments and numerical simulation analysis also suggested improved infrared reflection performance with respect to the size of aggregated ITO nanoclusters and their LSPR coupling effects in the nanofiber mat. The performed thermal insulation tests also indicated that the electrospun ITO/PAN nanofiber mat is promising for the thermal insulation of ambient temperature objects via IR radiation regulation.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
DOI
Gels
·
2025
·Vol. 11
·期 5
·317
·
IF 5.3
Xiubing Yao,Lingxiao Lan,Qiankun Hun,Xuanan Lu,Jianghua Wei,Xinghua Liang,Pengcheng Shen,Ying Long,Yifeng Guo
Solid-state electrolytes are widely expected to enhance the performance of lithium-ion batteries, providing higher energy density and improved safety. However, challenges still need to be solved in their practical application due to low ionic conductivity and high interfacial resistance at room temperature. In this study, we successfully developed a high-performance gel polymer electrolyte (GPEs) by blending poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) and polyacrylonitrile (PAN) through UV curing, cross-linking with ethoxylated trimethylolpropane triacrylate (ETPTA), and incorporating Li6.4La3Zr1.4Ta0.6O12(LLZTO). At room temperature, the ionic conductivity of the GPEs was 2.8 × 10−4S/cm, with a lithium-ion transference number of 0.6. Moreover, during lithium plating/stripping tests, the assembled Li/PPEL/Li symmetric cell exhibited stable cycling for up to 600 h at a current density of 0.1 mA/cm2. Notably, the GPEs enabled the LiFePO4/GPEs/Li battery to achieve excellent performance, delivering high discharge capacities at room temperature (164.3 mAh g−1at 0.1 C and 88.8 mAh g−1at 1 C), with a capacity retention of 89.4% after 200 cycles at 0.5 C. Therefore, solid-state batteries using this electrolyte exhibit excellent performance, including adequate capacity and cycling stability.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 12
·1782
·
IF 4.034
Yanhua Song,Yi Wang,Lan Xu,Mingdi Wang
A modified parallel electrode method (MPEM), conducted by placing a positively charged ring between the needle and the paralleled electrode collector, was presented to fabricate aligned polyacrylonitrile/graphene (PAN/Gr) composite nanofibers (CNFs) with nanopores in an electrospinning progress. Two kinds of solvents and one kind of nanoparticle were used to generate pores on composite nanofibers. The spinning parameters, such as the concentration of solute and solvent, spinning voltage and spinning distance were discussed, and the optimal parameters were determined. Characterizations of the aligned CNFs with nanopores were investigated by scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), high-resistance meter, and other methods. The results showed that graphene (Gr) nanoparticles were successfully introduced into aligned CNFs with nanopores and almost aligned along the axis of the CNFs. The MPEM method could make hydrophobic materials more hydrophobic, and improve the alignment degree and conductive properties of electrospun-aligned CNFs with nanopores. Moreover, the carbonized CNFs with nanopores, used as an electrode material, had a smaller charge-transfer resistance, suggesting potential application in electrochemical areas and electron devices.Keywords:graphene;aligned nanofibers;porous nanocomposites;electrospinning
研究领域:
材料科学
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纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Xuezhu Wang,Shunlong Pan,Ming Zhang,Junwen Qi,Xiuyun Sun,Cheng Gu,Lianjun Wang,Jiansheng Li
Fluoride contamination in groundwater is a worldwide problem that is related to human health. Zirconium-based adsorbents possess satisfactory selective defluoridation capacities. However, narrow efficiency pH range, easy aggregation and difficult separation are the main obstructions in practical application. In this study, the branched polyethyleneimine (bPEI) modified hydrous zirconium oxide (HZO)/polyacrylonitrile (PAN) nanofibers (NFs) are synthesized by immobilizing bPEI-HZO into PAN nanofibers via electrospinning. The resultant bPEI-HZO/PAN NFs exhibit a wide working pH range and an excellent adsorption capacity toward fluoride (67.51 mg·g −1 ) even at neutral condition, indicating non-negligible superiority in the practical application of groundwater defluoridation. This enhanced adsorption performance along with extended wider working pH range are ascribed to the optimization of the adsorbents from both composition and structure. Compositionally, the modification of bPEI improves the surface property of HZO, and thus increases fluoride capacity in alkaline groundwater. Structurally, electrospinning conquers the drawbacks of nano-adsorbents for both easy aggregation and difficult separation. In addition, the effect of co-existing ions was further investigated and the X-ray photoelectron spectroscopy (XPS) as well as fourier transform infrared spectrum (FTIR) measurements were used to clarify the fluoride adsorption mechanism. Furthermore, the dynamic adsorption and regeneration performance were accomplished through the fixed-bed column experiment. All the results indicated that bPEI-HZO/PAN NFs are promising materials for defluoridation from groundwater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Yang Chen,Ning Wang,Martin Jensen,Xianfeng Li
Nanofiber membranes have attracted considerable interest in water filtration owing to their unique structure and excellent performance, but large pore size and wide pore size distribution combined with weak inter-fiber strength are major limitations for practical applications. This work describes a facile and efficient method for nanofiber membrane fabrication with stable mechanical properties, high separation and excellent antifouling performance. The nanofiber membranes are prepared from a mixture of a low melting point polymer (thermoplastic polyurethane , TPU, T m = 52 °C) and a structural skeleton-forming polymer (polyacrylonitrile, PAN, T m = 317 °C) that undergoes electrospinning and hot-pressing. Hot-pressing treatment at 50–80 °C and 2 MPa melts the TPU phase to create inter-fiber connections, thereby reducing the nanofiber membrane pore size and improving its dimensional stability and mechanical properties. The connectivity of the nanofiber membrane can be controlled by adjusting the ratio of TPU and PAN in the nanofiber and the hot-pressing temperature. The tensile strength and Young's modulus of the hot-pressed membrane are 24.5 MPa and 630.6 MPa, which are 4.8 times and 6.0 times higher than the nascent membrane, respectively. The membrane pressed at 80 °C shows excellent filtration performance, with a high pure water flux of 8490 L m −2 h −1 and active sludge and 100 nm SiO 2 suspension retention efficiency of 99.99%. In addition, the hot-pressed membranes exhibited excellent antifouling performance and mechanical properties, meet the reusability and long-term service demand. Therefore, hot-pressed composite nanofiber membranes made of low melting point thermoplastic polymer and a skeleton polymer provide a facile and economical approach for the development of high-performance separation media.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 10
·1320
·
IF 3.9
Yinshan Xie,Xinning Wang,Hulin Li,Tao Wang,Wei Feng,Jian Li
Membrane separation has been widely utilized to eliminate pollutants from wastewater. Among them, a polyacrylonitrile (PAN) ultrafiltration (UF) membrane has presented outstanding stability, and distinguished chemical and thermal properties. However, UF membranes inevitably incur fouling issues during their operation procedure caused by contaminant adhesion on the membrane surface, which would restrict the operational efficiency and increase the maintenance cost. The conventional physical and chemical cleaning is not an effective technique to reduce the fouling due to the additional chemical addition and inevitable structure damage. Recently, UF membranes combined with photocatalytic materials are suggested to be a useful approach to conquer the membrane fouling issues. Herein, TiO2nanoparticles were utilized to blend with a PAN casting solution for fabricating a composite UF membrane via a phase inversion method. With a certain TiO2addition, the obtained membranes presented an enhancement of hydrophilicity, which could promote the water permeability and antifouling performance. The optimized M3 membrane prepared with 15.0 wt% PAN and 0.6 wt% TiO2exhibited an excellent water permeability up to 207.0 L m−2h−1bar−1with an outstanding 99.0% BSA rejection and superior antifouling property. In addition, the photocatalytic TiO2nanoparticles endowed the M3 membrane with a remarkable self-cleaning ability under the UV irradiation. This facile construction method offered new insight to enhance the UF membrane separation performance with an enhanced antifouling ability.Keywords:polyacrylonitrile;ultrafiltration;membrane fouling;TiO2;photocatalysis
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Guangyao Wang,Zhuoran Feng,Lin Sun,Miao Wang,Yulu Li,Lanling Xiu,Yueguang Fang,Junwei Ye
In order to reduce the possible harm caused by air pollution, including particulate matters (PM), harmful gases and airborne pathogens, high-efficiency air filtration materials are attracting more and more attention. Therefore, multifunctional materials that can filter these pollutants and kill pathogenic bacteria simultaneously are urgently desired. Herein, a copper-coordinated nanofibrous membrane, named PAN-P-Cu, was successfully prepared based on polyacrylonitrile (PAN) nanofibers grafted polyethyleneimine (PEI) by electrospinning and coordination assembly method. The PAN-P-Cu showed high filtration efficiency (99.9%) towards PM 0.3 under an airflow velocity of 5.3 cm s −1 and high filtration efficiency (99.94%) towards PM 10 , respectively. Importantly, used membrane could be regenerated by a simple washing process. Moreover, PAN-P-Cu possessed removal property of 60 mg g −1 for hydrogen sulfide through the occurrence of chemical reactions. Furthermore, the PAN-P-Cu also exhibited excellent antibacterial activities against Escherichia coli and Staphylococcus aureus (>99.99%). This work may provide new insights on designing high-performance and multi-functional air filtration materials for public health protection in complicated environments.
研究领域:
材料科学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Hongqiang Zhang,Tiansheng Bai,Jun Cheng,Fengjun Ji,Yuxiang Qiu,Zhen Zeng,Yuanyuan Li,Chenwu Zhang,Jingyu Lu,Lijie Ci,Deping Li
Irreversible capacity loss during the initial charge–discharge process poses a significant challenge to the practical application of high-theoretical-capacity anodes in lithium-ion batteries. Therefore, prelithiation technology has emerged as a pivotal choice for the advancement of high-energy-density lithium-ion batteries. Herein, we introduce a bilayer coating strategy with Li2S-polyacrylonitrile (Li2S-PAN) as the prelithiation source. Specifically, Li2S-PAN can selectively release active lithium ions during the initial charge process with a specific capacity of 695 mAh g–1. When integrated into a LiFePO4 cathode, Li2S-PAN can achieve a 48.2% additional capacity. Furthermore, the LiFePO4|SiC full cell exhibits a ∼20.0% initial lithium compensation with the reversible capacity increasing from 101 to 121 mAh g–1. Overall, this work proposes a facile and scalable route for the future application of high-theoretical-capacity anodes (silicon, tin, etc.) in the lithium-ion battery industry.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Fangyuan Yang,Feiyu Zhu,Hao Shi,Xuzhen Dong,Jie Sheng,Jinlong Zhou
In this experiment, PAN/Fe3O4@CTAB magnetic nanofibers (average diameter of 386 nm) were prepared by electrospinning for the removal of As(V) from an aqueous solution. Material characterization was analyzed using phase analysis of X-ray diffraction (XRD), a Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), and thermogravimetric analysis (TG), which demonstrated that the magnetic nanoparticles were successfully incorporated into the fiber membrane. Batch adsorption experiments revealed that the process followed pseudo-second-order kinetics and Langmuir isotherm models, achieving a maximum adsorption capacity of 138.66 mg/g, higher than that of unmodified PAN/Fe3O4 (93.59 mg/g). The adsorption efficiency of this adsorbent was high (97% removal in 300 min) and remained at 91% after five regeneration cycles (initial value of 98.65%). The response surface methodology (RSM) was also employed to construct and analyze the model to investigate the effects of three critical adsorption parameters, pH, adsorption time, and adsorbent concentration, on As(V). The optimal conditions for adsorption were determined to be a pH of 3.81, an adsorption time of 342 min, and an adsorbent concentration of 1.36 g/L, achieving an arsenic ion removal rate of 98.62%. The experimental results were found to be in accordance with the theoretical parameters, thereby providing further evidence that the synthesized material is an excellent adsorbent for the treatment of water pollution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）