REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Yan Li,Mohammed Awad Abedalwafa,Chunfang Ni,Noor Sanbhal,Lu Wang
Materials for the removal and visual monitoring of ultra-trace levels of lead ions (Pb 2+ ) from impaired drinking water are essential and vital to reduce the enormous effect of Pb 2+ on human health. However, it remains a significant challenge to achieve both high adsorption capacity and low naked eye detection limit. Here, we present a strategy to create a Pb 2+ removal and contamination degree detecting system by combining electrospun nanofibrous membranes (NMs) with a flow-through system. This approach allows amino acids to graft on hydrolyzed-polyacrylonitrile (AA-HPAN) NMs to perform as adsorbents and colorimetric strips with tortuous porous structure and large surface area. The resultant AA-HPAN NMs exhibit the integrated properties of high adsorption capacity and excellent reversibility. Furthermore, the dynamic removal and recognition experiment were performed and a naked-eye detection limit of 0.048 μM using sodium rhodizonate as the color initiator. Considering the good removal and monitoring performance of the AA-HPAN NMs, this intriguing approach may pave the way for constructing of membranes with the versatility to sever as a preventive strategy to keep the public from Pb 2+ exposure.
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
ACS Applied Nano Materials
·
2022
·
IF 6.14
An Chen,Hongying Guo,Jinghui Zhou,Yijun Li,Xiwen He,Langxing Chen,Yukui Zhang
The demand for oil cleanup is one of the most urgent issues and has been involved in global sustainable and green economic development. Existing industrial separation techniques are inefficient and time-consuming, and flexible membranes with selective wettability are currently advantageous for oil/water separation. Here, we report an effectual strategy to prepare composite membranes by combining covalent organic frameworks (COFs) with electrospun nanofibers for oil/water separation. A dip-coating strategy was developed to prepare two different Schiff base COFs [2,4,6-triformylphloroglucinol–4,4′-diaminobiphenyl (Tp-BD) and 3,5-tris(4-aminophenyl)benzene–terephthalaldehyde (TAPB-TPA)] on polyacrylonitrile (PAN) nanofibers at room temperature, in which Tp-BD and TAPB-TPA COFs could grow in situ on the surface of single-lined PAN nanofibers, structurally forming rough structures on the nanoscale. The thickness of the COF layer could be controlled by the concentration and volume of the ligand solution. Furthermore, on the basis of the rough structure, lauryl groups were linked to COF nanofibers to simultaneously obtain excellent hydrophobic COF nanofibers and maintain oleophilicity. Finally, superhydrophobic PAN/COF nanofibers with a water contact angle of 167° were applied to separate water-in-oil mixtures. The separation efficiencies of different samples with different oil and water concentrations were all greater than 95%, and the recycling performances of the materials were also satisfactory. The results show that the as-prepared nanofiber membranes have great potential for separating water-in-oil mixtures.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 7
·1212
·
IF 3.4
Xuefei Chen,Lubing Zha,Fangmeng Zeng,Jie Meng,Tiandi Pan,Jindan Lv
Considering photocatalytic degradation technology has recently attracted great attention for dyeing wastewater treatment, the polyacrylonitrile (PAN) nanofibrous membrane coated with the TA/FeIIIcomplexes was proposed as a novel photocatalyst in this work. The successful self-assembly of TA/FeIIIcomplexes on the PAN nanofibrous membrane after layer-by-layer deposition of TA and FeIIIwas confirmed by the analyses of chemical structure, morphology, and hydrophilicity. With the number of coating cycles, more TA/FeIIIcomplexes coated on the PAN nanofibrous membrane, which contributed to the excellent photocatalytic activity. Whereas, when the coating cycles reached seven, the photocatalytic performance of the modified PAN nanofibrous membrane deteriorated due to the serious aggregation of TA/FeIIIcomplexes. Under optimum five coating cycles, owing to its great light absorbance capability, the modified PAN nanofibrous membrane achieved 98% degradation efficiency of RhB after 360 min illumination. This work would offer a promising high-performance photocatalyst for dyeing wastewater treatment.Keywords:photocatalysis;PAN nanofibrous membrane;TA/FeIIIcomplexes;coating cycle
研究领域:
环境科学
·
材料科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 2
·194-198
·
IF 1.022
Xing Guiying
Aminated polyacrylonitrile (PAN-NH) nanofiber mats prepared by electrospinning and then aminated by multiamines with different chemical structures have been used for the immobilization of palladium. The PAN-NH fiber morphologies were characterized by scanning electron microscopy (SEM) and the dispersion of palladium particles on the PAN-NH fiber were examined by transmission electron microscopy (TEM). The catalytic activity and recyclability of the prepared heterogeneous palladium catalysts have been evaluated by the Heck reaction of iodobenzene with n -butyl acrylate. It was found that the catalytic activities of PAN-NH-Pd catalysts could be correlated with the chelating energies of the PAN-NH fiber mats with Pd active species.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 3
·852-864
·
IF 17.2
Su Hongwei,Hu Hua,Li Zhenyu,Yan Guilong,Wang Li,Xiang Dong,Zhao Chunxia,Wu Yuanpeng,Chen Jingyu,Wang Ce
High-performance multifunctional filtration membranes are highly required in treating practically complex oily wastewater systems, but still a challenge unsolved. Herein, we propose a facile route to address these challenges simultaneously by simply constructing electrospun pre-oxidized polyacrylonitrile nanofibrous membrane (p-PAN NM). Given the pre-oxidation process, the p-PAN NM displays not only robust anti-corrosive tolerance against diverse corrosive media, but also superhydrophilicity/underwater superoleophobicity. Additionally, ~ 99% separation efficiency, ~ 100% oil-fouling recovery, and ultra-long service life (up to 265 h) have been realized in separating large-scale surfactant stabilized soybean/crude oil-in-water emulsions. Furthermore, strong anti-corrosive performance against various corrosive media (e.g., 1 M HCl, 1 M NaOH, or 10 wt% NaCl) has been achieved as well. Spin-unrestricted density functional theory (DFT) computations implemented in the Dmol3 modulus has been conducted to understand the robust fouling recovery and the variation of surficial wettability after pre-oxidation. These outstanding filtration functions make our NM hold great potential in separating viscous oil/water emulsions under harsh conditions. Graphical Abstract
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
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yuman Zhou,Huanru Liao,Qinghuan Qi,Chaozhong Guo,Kun Qi,Kangkang Ou,Jianxin He,Hongbo Wang,Rongwu Wang,Xiaogang Chen
Stretchable yarn strain sensors demonstrate incomparable advantages for application in wearable electronic devices, such as health monitors, interfaces for human–computer interactions, and flexible robots, because of their good flexibility and ease of integration with other components and fabrics. In this study, a graphene oxide (GO)-doped polyacrylonitrile nanofiber-coated hybrid yarn with a uniformly wavy structure was used as the elastic substrate, and an in situ polymerized polypyrrole conductive polymer was applied to the nanofiber surface to construct a highly stretchable yarn strain sensor. The obtained sensor exhibited an advantageous wavy structure, which endowed it with a wide monitoring range of 0–500%. The large number of nanofibers in the wave also provided a large contact area, which endowed the sensor with an outstanding resistance change of 173.13 under stretching. In addition, the sensor could monitor the bending deformation; the bending sensitivity was 16.6 at a bending degree of 4 cm. Meanwhile, the sensor exhibited stable cycle durability, and only a small sensitivity loss rate was evident after 10,000 cycles during stretching and bending. In addition, the sensor exhibited ideal weaveability and integration and could be easily woven into any fabric. Significantly, it could monitor human muscle vibration and body movement, indicating its high potential for application in wearable electronic devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2018
·Vol. 29
·期 3
·560-571
·
IF 1.444
Xu Zhiqun,Wei Congcong,Jin Jiali,Xu Wenkai,Wu Qiao,Gu Junjie,Ou Minrui,Xu Xiaoping
In this study, a novel electrospun nanofibrous composite was synthesized from polyacrylonitrile (PAN) and well-dispersed oxide nanoparticles containing Ti and Ag (PAN-TA). The nanoparticles incorporated into the nanofibers can endow the composite with photocatalytic and antimicrobial ability. The morphologies and structure of the nanofibers were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Controlled experiments were carried out with the effects of chemical modification, solution pH, temperature, dosage, contact time, and initial concentration of the dye. The methylene blue (MB) dye was completely removed within 20 min at room temperature 25 ºC with high maximum retention capacity of 155.4 mg g-1. Moreover, equilibrium data and kinetics data indicated that the dye adsorption agreed well with the Langmuir isotherm model and pseudo-second order model, respectively. In addition, the nanofibers could be easily separated from dye solution and showed high reusability for numerous repeat cycles, thus indicating good application prospects for the wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xu Yang,Yuhong Zhou,Zhaojie Sun,Chunhui Yang,Dongyan Tang
ZIF-8@ZIF-8/PAN nanofibers were fabricated by the incorporation of zeolitic imidazolate frameworks (ZIFs) with electrospun polyacrylonitrile (PAN) nanofibers, and following by the in-situ growth of ZIFs onto the surface of the nanofibers. The abundant micropores and active sites of ZIFs supplied the effective adsorption and reduction to heavy metal ions of Cr(VI). The obtained novel nanofibers overcome the crystal agglomeration of ZIF-8 effectively and maintained the porous structures by the nanofibrous morphology of PAN and the evenly distributed ZIF-8, and thus exhibited relative higher surface area (871.0 m 2 g −1 ) and excellent loading efficiency of ZIF-8 (82.9 %). As target adsorbate, Cr(VI) could be removed from aqueous media effectively with the maximum adsorption capacity ( q max ) of 39.68 mg g −1 , and with better recyclability. Significantly, guided with the proposed feasible adsorption-reduction mechanism of Cr(VI), toxic Cr(VI) ions could be further reduced partially to the relative harmless Cr(III). Potentially, the present stable and advantageous approach to loading and growing metal organic frameworks (MOFs) onto electrospun nanofibers could be extended to other water-stable MOFs and to remove various heavy metal ions.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Junlu Sheng,Min Zhang,Yue Xu,Jianyong Yu,Bin Ding
The demand of water-resistant and breathable materials applied to a separation medium and protective garments is steadily increasing. Typical approaches to obtain these functional materials are based on hydrophobic agents and porous substrates with small fiber diameter, tiny pore, and high porosity. However, a fluorinated hydrophobic finishing agent usually employed in providing effective waterproofness is limited with respect to their environmental persistence and toxic potential. Herein, with the aim to keep a balance between the water-resistance and breathability as well as mechanical properties, we fabricate a novel fluoride-free functional membrane by electrospun polyacrylonitrile (PAN) nanofibers modified with polydimethylsiloxane (PDMS). As determined by morphological, DSC, and FT-IR analyses, the curing reaction of PDMS macromolecules formed an abundance of hydrophobic adhesive structures, which improved the waterproof performance dramatically and imparted relative good breathability at the same time. By systematically tuning the curing temperature as well as the concentration of PDMS, the modified PAN membranes with 4 wt % PDMS possessed good water-resistance (80.9 kPa), modest vapor permeability (12.5 kg m–2 d–1), and air permeability (9.9 mm s–1). Compared with pristine PAN membranes, the modified membranes were endowed with enhanced tensile stress of 15.7 MPa. The good comprehensive performance of the as-prepared membranes suggested their potential applications in protective clothing, membrane distillation, self-cleaning materials, and other medical products. Furthermore, the proposed relationship between porous structure and waterproof/breathable property as one considerable principle is applicable to designing functional membranes with different levels of protective and comfortable performance.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 101
·99353-99360
·
IF 3.289
Jiaojie He,Wei Wang,Wenxin Shi,Fuyi Cui
La2O3 nanoparticle-doped PAN nanofiber mats were prepared by an electrospinning process. During the formation process, PAN nanofibers served as the matrix for immobilizing the La2O3 nanoparticles. Due to the great hydrophilicity of PAN nanofibers and the strong chemical affinity of phosphate/lanthanum bonds, the functional composite nanofiber mats exhibited high removal capacity for phosphate with a maximum adsorption capacity of 77.76 mg P per g (La), which guaranteed severe phosphate-deficient conditions. The effects of both the effective nutrient (phosphate) starvation and the close contact of E. coli with composites led to great antibacterial activity. The nutrient starvation (indirect antibacteria) was proved to be the primary mechanism. The intimate contact (direct antibacteria) was revealed as a supplementary role that only induced cell death without the existence of phosphate. The results demonstrated the feasibility of this antibacterial strategy through phosphate-starvation. In addition, the composite nanofiber mats implied a practical application by virtue of a simple fabrication and easy separation from the heterogeneous systems after using.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2022
·
IF 2.455
Jinyu Wang,Xiangshun Li,Liming Wang,Xiaohong Qin,Yunhua Cui
The color of textiles plays a crucial role in meeting humans’ aesthetics needs and pleasure. Nanofiber has potential application prospects in textile and apparel due to its superior properties, such as the high specific surface area and porosity. Simultaneously, the coloring property has attracted widespread attention. However, the dyeing of polyacrylonitrile (PAN) nanofibers with reactive dyes remains a challenge due to the lack of reactive groups. Herein, an efficient strategy is proposed to successfully color electrospun PAN nanofibers with CI Reactive Red 2, enabled by introducing polyethyleneimine (PEI). Firstly, through entangling the molecular chain of PEI in solution, PAN is endowed with abundant cationic groups. Then, PAN/PEI nanofibers were obtained by electrospinning technology and further dyed using the reactive dye. More specifically, the different dyeing parameters, such as dyeing time, temperature, concentration and PEI concentration, were optimized. Compared to pure PAN nanofiber, PAN/PEI nanofiber achieved a higher dye uptake (96%) and better color fastness. This work offers an energy-saving and simple manner for improving the dyeing performance of PAN nanofibers using reactive dye.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chunhao Li,Caifeng Wang,Yiting Liu,Yang Zhang,Shuai Wang,Ruisheng Zhao,Aiju Xu
Photoresponsive materials may be used to improve the humidity of a microenvironment, thus improving the comfort of people occupying that space. In this work, by constructing a synergistic layer (amino groups) and a regulating layer (spiropyran compounds) on the surface of polyacrylonitrile (PAN) electrospun membranes, we successfully developed fiber materials with excellent mechanical stability that can reversibly regulate the humidity of the microenvironment. Spiropyran molecules can undergo photoisomerization (reversible polar-nonpolar structure interconversion) by conversion of ultraviolet/visible light. The wettability and microenvironment humidity can be controlled bidirectionally under different light sources. More importantly, the amino groups on the fiber surface can assist the ring-opened merocyanine in absorbing water molecule, thus playing a synergistic role. Moreover, changing the electrospinning voltages can help regulate the porosity of the fiber materials, which can change wettability and the humidity range regulation. The energy change of spiropyran before and after water absorption was obtained by density functional theory calculations, and it is further proven that the synergistic layer can promote the ability of humidity regulation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）