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Xiangyang Shi - One of the best experts on this subject based on the ideXlab platform.
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organic inorganic nanohybrids formed using Electrospun Polymer Nanofibers as nanoreactors
Coordination Chemistry Reviews, 2018Co-Authors: Zheng Qiao, Mingwu Shen, Yunchao Xiao, Meifang Zhu, Serge Mignani, Jean-pierre Majoral, Xiangyang ShiAbstract:Abstract This review article presents recent advances on the use of Electrospun Nanofibers as nanoreactors to synthesize various organic/inorganic hybrid nanomaterials consisting of a Polymeric matrix hosting in situ generated inorganic nanoparticles (NPs) for different applications. Electrospun Nanofibers possess attractive properties such as controllable fiber diameters, high aspect ratio, and high surface area to volume ratio, affording their uses as a unique nanoreactor system to fabricate a range of organic/inorganic hybrid nanomaterials. In particular, the nanohybrids consisting of metal, metal oxide, metal sulfide, or metal chloride NPs can be in situ generated within the Polymeric fiber matrix via different reactions such as UV and microwave irradiation, chemical reduction, heating treatment, and galvanic replacement reaction. The formed organic/inorganic hybrid nanomaterials have been used for environmental remediation, catalysis, electronic and sensing devices, energy, wound dressing, etc. Some of the key developments in this area of research will be introduced in detail.
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efficient catalytic reduction of hexavalent chromium using palladium nanoparticle immobilized Electrospun Polymer Nanofibers
ACS Applied Materials & Interfaces, 2012Co-Authors: Yunpeng Huang, Mingwu Shen, Meifang Zhu, Shige Wang, Rui Guo, Xueyan Cao, Xiangyang ShiAbstract:We report a facile and economic approach to fabricating catalytic active palladium (Pd) nanoparticle (NP)-immobilized Electrospun polyethyleneimine (PEI)/polyvinyl alcohol (PVA) Nanofibers for catalytic reduction of hexavalent chromium (Cr(VI)) to trivalent chromium (Cr(III)). In this study, PEI/PVA nanofibrous mats were first Electrospun from homogeneous mixture solution of PEI and PVA, followed by cross-linking with glutaraldehyde vapor to render the fibers with good water stability. The nanofibrous mats were then alternatively soaked in potassium tetrachloropallidate (K2PdCl4) and sodium borohydride solution, and the PdCl42- anions complexed with the free amine groups of PEI were able to be reduced to form zero-valent Pd NPs. The formed Pd NP-containing PEI/PVA Nanofibers were characterized by different techniques. We show that the immobilization of Pd NPs does not significantly change the morphology of the PEI/PVA Nanofibers; instead the mechanical durability of the fibers is significantly improved. T...
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fabrication of multiwalled carbon nanotube reinforced Electrospun Polymer Nanofibers containing zero valent iron nanoparticles for environmental applications
Journal of Materials Chemistry, 2010Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:A new approach to immobilizing zero-valent iron nanoparticles (ZVI NPs) into Electrospun Polymer Nanofibers with enhanced mechanical properties for environmental applications is presented. In this approach, multiwalled carbon nanotubes (MWCNTs) are mixed with polyacrylic acid (PAA)/polyvinyl alcohol (PVA) mixture Polymer solution for subsequent electrospinning to form uniform Nanofibers. The MWCNT-incorporated PAA/PVA Nanofibers are crosslinked and then used as a nanoreactor to complex Fe(III) ions through binding with the PAA carboxyl groups for the reductive formation of ZVI NPs. The MWCNT-incorporated PAA/PVA Nanofibers before and after immobilization with ZVI NPs are characterized using scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and mechanical property measurements. We show that the mechanical properties of uniform nanofibrous mats with and without ZVI NPs are significantly enhanced even with only 1.0 wt% MWCNTs incorporated. The MWCNT-reinforced PAA/PVA nanofibrous mats containing ZVI NPs (1.6 nm) display excellent capability to decolorize model dyes such as methyl blue, acridine orange, and acid fuchsine with a decoloration percentage of more than 90%. Likewise, the same nanofibrous mats are found to be able to effectively degrade trichloroethylene, a model chlorinated hydrocarbon contaminant, with a degradation efficiency approaching 93%. The MWCNT-reinforced PAA/PVA nanofibrous mats may be used for generating other functionalized nanofiber-based complex materials with enhanced mechanical properties for applications in environmental remediation, catalysis, sensing, and biomedical sciences.
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polyelectrolyte multilayer assisted immobilization of zero valent iron nanoparticles onto Polymer Nanofibers for potential environmental applications
ACS Applied Materials & Interfaces, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:We report a facile approach to synthesizing and immobilizing zero-valent iron nanoparticles (ZVI NPs) onto polyelectrolyte (PE) multilayer-assembled Electrospun Polymer Nanofibers for potential environmental applications. In this approach, negatively charged cellulose acetate (CA) Nanofibers fabricated by electrospinning were assembled with multilayers of poly(diallyldimethylammonium chloride) (PDADMAC) and polyacrylic acid (PAA) through electrostatic layer-by-layer assembly. The formed PAA/PDADMAC multilayers onto CA Nanofibers were then used as a nanoreactor to complex Fe(II) ions through the binding with the free carboxyl groups of PAA for subsequent reductive formation of ZVI NPs. Combined scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetry analysis studies demonstrate that the ZVI NPs are successfully synthesized and uniformly distributed into the PE multilayers assembled onto the CA Nanofibers. ...
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immobilization of zerovalent iron nanoparticles into Electrospun Polymer Nanofibers synthesis characterization and potential environmental applications
Journal of Physical Chemistry C, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Xiangyang ShiAbstract:We present a facile approach to immobilizing zerovalent iron nanoparticles (ZVI NPs) into Electrospun Polymer nanofibrous mats. Electrospun poly(acrylic acid) (PAA)/poly(vinyl alcohol) (PVA) nanofibrous mats were treated at an elevated temperature to render them water stable. The water-insoluble nanofibrous mats were then used as nanoreactors to complex ferric iron for subsequent formation and immobilization of ZVI NPs. Scanning electron microscopy (SEM) studies show that the smooth, uniform morphology of the Electrospun nanofibrous mats does not significantly change after immobilization with ZVI NPs. Energy-dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and thermogravimetric analysis (TGA) were used to characterize the Polymer Nanofibers before and after the immobilization of ZVI NPs. We show that the formed ZVI NPs are uniformly distributed into the Electrospun Nanofibers with a mean partic...
Mingwu Shen - One of the best experts on this subject based on the ideXlab platform.
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organic inorganic nanohybrids formed using Electrospun Polymer Nanofibers as nanoreactors
Coordination Chemistry Reviews, 2018Co-Authors: Zheng Qiao, Mingwu Shen, Yunchao Xiao, Meifang Zhu, Serge Mignani, Jean-pierre Majoral, Xiangyang ShiAbstract:Abstract This review article presents recent advances on the use of Electrospun Nanofibers as nanoreactors to synthesize various organic/inorganic hybrid nanomaterials consisting of a Polymeric matrix hosting in situ generated inorganic nanoparticles (NPs) for different applications. Electrospun Nanofibers possess attractive properties such as controllable fiber diameters, high aspect ratio, and high surface area to volume ratio, affording their uses as a unique nanoreactor system to fabricate a range of organic/inorganic hybrid nanomaterials. In particular, the nanohybrids consisting of metal, metal oxide, metal sulfide, or metal chloride NPs can be in situ generated within the Polymeric fiber matrix via different reactions such as UV and microwave irradiation, chemical reduction, heating treatment, and galvanic replacement reaction. The formed organic/inorganic hybrid nanomaterials have been used for environmental remediation, catalysis, electronic and sensing devices, energy, wound dressing, etc. Some of the key developments in this area of research will be introduced in detail.
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efficient catalytic reduction of hexavalent chromium using palladium nanoparticle immobilized Electrospun Polymer Nanofibers
ACS Applied Materials & Interfaces, 2012Co-Authors: Yunpeng Huang, Mingwu Shen, Meifang Zhu, Shige Wang, Rui Guo, Xueyan Cao, Xiangyang ShiAbstract:We report a facile and economic approach to fabricating catalytic active palladium (Pd) nanoparticle (NP)-immobilized Electrospun polyethyleneimine (PEI)/polyvinyl alcohol (PVA) Nanofibers for catalytic reduction of hexavalent chromium (Cr(VI)) to trivalent chromium (Cr(III)). In this study, PEI/PVA nanofibrous mats were first Electrospun from homogeneous mixture solution of PEI and PVA, followed by cross-linking with glutaraldehyde vapor to render the fibers with good water stability. The nanofibrous mats were then alternatively soaked in potassium tetrachloropallidate (K2PdCl4) and sodium borohydride solution, and the PdCl42- anions complexed with the free amine groups of PEI were able to be reduced to form zero-valent Pd NPs. The formed Pd NP-containing PEI/PVA Nanofibers were characterized by different techniques. We show that the immobilization of Pd NPs does not significantly change the morphology of the PEI/PVA Nanofibers; instead the mechanical durability of the fibers is significantly improved. T...
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fabrication of multiwalled carbon nanotube reinforced Electrospun Polymer Nanofibers containing zero valent iron nanoparticles for environmental applications
Journal of Materials Chemistry, 2010Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:A new approach to immobilizing zero-valent iron nanoparticles (ZVI NPs) into Electrospun Polymer Nanofibers with enhanced mechanical properties for environmental applications is presented. In this approach, multiwalled carbon nanotubes (MWCNTs) are mixed with polyacrylic acid (PAA)/polyvinyl alcohol (PVA) mixture Polymer solution for subsequent electrospinning to form uniform Nanofibers. The MWCNT-incorporated PAA/PVA Nanofibers are crosslinked and then used as a nanoreactor to complex Fe(III) ions through binding with the PAA carboxyl groups for the reductive formation of ZVI NPs. The MWCNT-incorporated PAA/PVA Nanofibers before and after immobilization with ZVI NPs are characterized using scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and mechanical property measurements. We show that the mechanical properties of uniform nanofibrous mats with and without ZVI NPs are significantly enhanced even with only 1.0 wt% MWCNTs incorporated. The MWCNT-reinforced PAA/PVA nanofibrous mats containing ZVI NPs (1.6 nm) display excellent capability to decolorize model dyes such as methyl blue, acridine orange, and acid fuchsine with a decoloration percentage of more than 90%. Likewise, the same nanofibrous mats are found to be able to effectively degrade trichloroethylene, a model chlorinated hydrocarbon contaminant, with a degradation efficiency approaching 93%. The MWCNT-reinforced PAA/PVA nanofibrous mats may be used for generating other functionalized nanofiber-based complex materials with enhanced mechanical properties for applications in environmental remediation, catalysis, sensing, and biomedical sciences.
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polyelectrolyte multilayer assisted immobilization of zero valent iron nanoparticles onto Polymer Nanofibers for potential environmental applications
ACS Applied Materials & Interfaces, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:We report a facile approach to synthesizing and immobilizing zero-valent iron nanoparticles (ZVI NPs) onto polyelectrolyte (PE) multilayer-assembled Electrospun Polymer Nanofibers for potential environmental applications. In this approach, negatively charged cellulose acetate (CA) Nanofibers fabricated by electrospinning were assembled with multilayers of poly(diallyldimethylammonium chloride) (PDADMAC) and polyacrylic acid (PAA) through electrostatic layer-by-layer assembly. The formed PAA/PDADMAC multilayers onto CA Nanofibers were then used as a nanoreactor to complex Fe(II) ions through the binding with the free carboxyl groups of PAA for subsequent reductive formation of ZVI NPs. Combined scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetry analysis studies demonstrate that the ZVI NPs are successfully synthesized and uniformly distributed into the PE multilayers assembled onto the CA Nanofibers. ...
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immobilization of zerovalent iron nanoparticles into Electrospun Polymer Nanofibers synthesis characterization and potential environmental applications
Journal of Physical Chemistry C, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Xiangyang ShiAbstract:We present a facile approach to immobilizing zerovalent iron nanoparticles (ZVI NPs) into Electrospun Polymer nanofibrous mats. Electrospun poly(acrylic acid) (PAA)/poly(vinyl alcohol) (PVA) nanofibrous mats were treated at an elevated temperature to render them water stable. The water-insoluble nanofibrous mats were then used as nanoreactors to complex ferric iron for subsequent formation and immobilization of ZVI NPs. Scanning electron microscopy (SEM) studies show that the smooth, uniform morphology of the Electrospun nanofibrous mats does not significantly change after immobilization with ZVI NPs. Energy-dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and thermogravimetric analysis (TGA) were used to characterize the Polymer Nanofibers before and after the immobilization of ZVI NPs. We show that the formed ZVI NPs are uniformly distributed into the Electrospun Nanofibers with a mean partic...
Xuejun Kang - One of the best experts on this subject based on the ideXlab platform.
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Application of Packed-Nanofibers Solid-phase Extraction for Determination of Rhodamine B in Sausage
Journal of Food Engineering and Technology, 2019Co-Authors: Jianjun Deng, Tao Kang, Xuejun KangAbstract:A method for the determination of Rhodamine B in sausage was developed and validated. After extraction of Rhodamine B with acetonitrile from foodstuffs, a novel Electrospun Polymer Nanofibers packed micro-column was used for cleaning and concentrating of the analyte in the sample. High performance liquid chromatography with fluorescence detection (HPLC-Flu) was used for the determination of Rhodamine B in the sample. The mobile phase was composed of 3.0 g L-1 phosphate buffer and methanol (3:7, volume ratio), and the pH was adjusted to 7. 0 with orthophosphoric acid. The results showed that the standard curve was linear over the validated concentrations range of 2-500 ng g-1, and the limit of detection (LOD) and the limit of quantitation (LOQ) for Rhodamine B spiked samples was 0. 2 ng g-1 and 0. 7 ng g-1, respectively. The average recoveries of Rhodamine B were 90.4% -94.3% for sausage, and the relative standard deviation of the method was from 1.7% to 3.8%. This proposed method was applied to real sample, and there was no Rhodamine B found in sausage.
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Electrospun Polymer Nanofibers as a solid phase extraction sorbent for the determination of trace pollutants in environmental water
Analytical and Bioanalytical Chemistry, 2008Co-Authors: Xuejun Kang, Liqin Chen, Yilei Zhang, Hongmei WeiAbstract:This paper describes the novel preparation of three kinds of Nanofibers [poly(styrene-co-methacrylic acid), poly(styrene-co-p-styrene sulfonate), polystyrene] investigated as solid-phase extraction (SPE) sorbents to extract six compounds (nitrobenzene, 2-naphthol, benzene, n-butyl p-hydroxybenzoate, naphthalene, p-dichlorobenzene) in environmental water by high-performance liquid chromatography. Parameters affecting extraction efficiency were investigated in detail to explore the extraction mechanism of the Nanofibers. Under optimized conditions, six compounds followed an excellent linear relationship in the range 10–5,000 ng mL−1 with coefficients of determination (r2) greater than 0.99. The repeatability (expressed as relative standard deviations) was from 3.0 to 7.0%, corresponding to 2.0 mL of water samples at 25 and 500 ng mL−1 spiked levels for the six compounds. The limits of detection varied from 0.01 to 0.15 ng mL−1 (signal-to-noise ratio of3). A comparison of the SPE using Nanofibers as sorbents and the most commonly used octadecylsilica SPE cartridges was carried out in terms of absolute recovery, sensitivity, and reproducibility for the compounds investigated. Finally, the method was applied to four real water samples. The results highlighted the importance of functional groups, and the polarity of Nanofibers in controlling sorption of target compounds, and clearly showed that the new method could be a viable and environmentally friendly technique for analyzing pollutants in environmental samples.
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the investigation of Electrospun Polymer Nanofibers as a solid phase extraction sorbent for the determination of trazodone in human plasma
Analytica Chimica Acta, 2007Co-Authors: Xuejun Kang, Cao Pan, Yingfang Yao, Yian WangAbstract:Abstract A novel micro-extraction procedure was developed through the use of an Electrospun Polymer nanofiber as a solid-phase extraction (SPE) sorbent to directly extract trazodone from human plasma. The target compound was then monitored by a high performance liquid chromatography with ultraviolet detector (HPLC-UV) system. Parameters of influencing the extraction efficiency, such as fiber diameter, fiber packing amount, eluted solvent, pH and ionic strength were investigated. Under the optimized conditions, a linear response for trazodone over the range of 20–2000 ng mL−1 was achieved with a γ2 value of 0.9996. The precision of the method was examined with relative standard deviations of 5.7, 2.7, 2.2% corresponding to 50, 200, and 500 ng mL−1, respectively, of trazodone spiked into 0.1 mL of plasma samples. The extraction recoveries of 58.3–75.2% and the relative recoveries of 94.6–105.5% were obtained. The limit of detection (LOD) was determined to be 8 ng mL−1. A 15 min of HPLC gradient was successfully applied to determine trazodone from human plasma. Due to its simplicity, selectivity and sensitivity, the method may be applied to pharmacokinetic and pharmacodynamic studies of drugs.
Shili Xiao - One of the best experts on this subject based on the ideXlab platform.
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fabrication of multiwalled carbon nanotube reinforced Electrospun Polymer Nanofibers containing zero valent iron nanoparticles for environmental applications
Journal of Materials Chemistry, 2010Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:A new approach to immobilizing zero-valent iron nanoparticles (ZVI NPs) into Electrospun Polymer Nanofibers with enhanced mechanical properties for environmental applications is presented. In this approach, multiwalled carbon nanotubes (MWCNTs) are mixed with polyacrylic acid (PAA)/polyvinyl alcohol (PVA) mixture Polymer solution for subsequent electrospinning to form uniform Nanofibers. The MWCNT-incorporated PAA/PVA Nanofibers are crosslinked and then used as a nanoreactor to complex Fe(III) ions through binding with the PAA carboxyl groups for the reductive formation of ZVI NPs. The MWCNT-incorporated PAA/PVA Nanofibers before and after immobilization with ZVI NPs are characterized using scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and mechanical property measurements. We show that the mechanical properties of uniform nanofibrous mats with and without ZVI NPs are significantly enhanced even with only 1.0 wt% MWCNTs incorporated. The MWCNT-reinforced PAA/PVA nanofibrous mats containing ZVI NPs (1.6 nm) display excellent capability to decolorize model dyes such as methyl blue, acridine orange, and acid fuchsine with a decoloration percentage of more than 90%. Likewise, the same nanofibrous mats are found to be able to effectively degrade trichloroethylene, a model chlorinated hydrocarbon contaminant, with a degradation efficiency approaching 93%. The MWCNT-reinforced PAA/PVA nanofibrous mats may be used for generating other functionalized nanofiber-based complex materials with enhanced mechanical properties for applications in environmental remediation, catalysis, sensing, and biomedical sciences.
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polyelectrolyte multilayer assisted immobilization of zero valent iron nanoparticles onto Polymer Nanofibers for potential environmental applications
ACS Applied Materials & Interfaces, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:We report a facile approach to synthesizing and immobilizing zero-valent iron nanoparticles (ZVI NPs) onto polyelectrolyte (PE) multilayer-assembled Electrospun Polymer Nanofibers for potential environmental applications. In this approach, negatively charged cellulose acetate (CA) Nanofibers fabricated by electrospinning were assembled with multilayers of poly(diallyldimethylammonium chloride) (PDADMAC) and polyacrylic acid (PAA) through electrostatic layer-by-layer assembly. The formed PAA/PDADMAC multilayers onto CA Nanofibers were then used as a nanoreactor to complex Fe(II) ions through the binding with the free carboxyl groups of PAA for subsequent reductive formation of ZVI NPs. Combined scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetry analysis studies demonstrate that the ZVI NPs are successfully synthesized and uniformly distributed into the PE multilayers assembled onto the CA Nanofibers. ...
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immobilization of zerovalent iron nanoparticles into Electrospun Polymer Nanofibers synthesis characterization and potential environmental applications
Journal of Physical Chemistry C, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Xiangyang ShiAbstract:We present a facile approach to immobilizing zerovalent iron nanoparticles (ZVI NPs) into Electrospun Polymer nanofibrous mats. Electrospun poly(acrylic acid) (PAA)/poly(vinyl alcohol) (PVA) nanofibrous mats were treated at an elevated temperature to render them water stable. The water-insoluble nanofibrous mats were then used as nanoreactors to complex ferric iron for subsequent formation and immobilization of ZVI NPs. Scanning electron microscopy (SEM) studies show that the smooth, uniform morphology of the Electrospun nanofibrous mats does not significantly change after immobilization with ZVI NPs. Energy-dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and thermogravimetric analysis (TGA) were used to characterize the Polymer Nanofibers before and after the immobilization of ZVI NPs. We show that the formed ZVI NPs are uniformly distributed into the Electrospun Nanofibers with a mean partic...
Rui Guo - One of the best experts on this subject based on the ideXlab platform.
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efficient catalytic reduction of hexavalent chromium using palladium nanoparticle immobilized Electrospun Polymer Nanofibers
ACS Applied Materials & Interfaces, 2012Co-Authors: Yunpeng Huang, Mingwu Shen, Meifang Zhu, Shige Wang, Rui Guo, Xueyan Cao, Xiangyang ShiAbstract:We report a facile and economic approach to fabricating catalytic active palladium (Pd) nanoparticle (NP)-immobilized Electrospun polyethyleneimine (PEI)/polyvinyl alcohol (PVA) Nanofibers for catalytic reduction of hexavalent chromium (Cr(VI)) to trivalent chromium (Cr(III)). In this study, PEI/PVA nanofibrous mats were first Electrospun from homogeneous mixture solution of PEI and PVA, followed by cross-linking with glutaraldehyde vapor to render the fibers with good water stability. The nanofibrous mats were then alternatively soaked in potassium tetrachloropallidate (K2PdCl4) and sodium borohydride solution, and the PdCl42- anions complexed with the free amine groups of PEI were able to be reduced to form zero-valent Pd NPs. The formed Pd NP-containing PEI/PVA Nanofibers were characterized by different techniques. We show that the immobilization of Pd NPs does not significantly change the morphology of the PEI/PVA Nanofibers; instead the mechanical durability of the fibers is significantly improved. T...
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fabrication of multiwalled carbon nanotube reinforced Electrospun Polymer Nanofibers containing zero valent iron nanoparticles for environmental applications
Journal of Materials Chemistry, 2010Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:A new approach to immobilizing zero-valent iron nanoparticles (ZVI NPs) into Electrospun Polymer Nanofibers with enhanced mechanical properties for environmental applications is presented. In this approach, multiwalled carbon nanotubes (MWCNTs) are mixed with polyacrylic acid (PAA)/polyvinyl alcohol (PVA) mixture Polymer solution for subsequent electrospinning to form uniform Nanofibers. The MWCNT-incorporated PAA/PVA Nanofibers are crosslinked and then used as a nanoreactor to complex Fe(III) ions through binding with the PAA carboxyl groups for the reductive formation of ZVI NPs. The MWCNT-incorporated PAA/PVA Nanofibers before and after immobilization with ZVI NPs are characterized using scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and mechanical property measurements. We show that the mechanical properties of uniform nanofibrous mats with and without ZVI NPs are significantly enhanced even with only 1.0 wt% MWCNTs incorporated. The MWCNT-reinforced PAA/PVA nanofibrous mats containing ZVI NPs (1.6 nm) display excellent capability to decolorize model dyes such as methyl blue, acridine orange, and acid fuchsine with a decoloration percentage of more than 90%. Likewise, the same nanofibrous mats are found to be able to effectively degrade trichloroethylene, a model chlorinated hydrocarbon contaminant, with a degradation efficiency approaching 93%. The MWCNT-reinforced PAA/PVA nanofibrous mats may be used for generating other functionalized nanofiber-based complex materials with enhanced mechanical properties for applications in environmental remediation, catalysis, sensing, and biomedical sciences.
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polyelectrolyte multilayer assisted immobilization of zero valent iron nanoparticles onto Polymer Nanofibers for potential environmental applications
ACS Applied Materials & Interfaces, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Qingguo Huang, Xiangyang ShiAbstract:We report a facile approach to synthesizing and immobilizing zero-valent iron nanoparticles (ZVI NPs) onto polyelectrolyte (PE) multilayer-assembled Electrospun Polymer Nanofibers for potential environmental applications. In this approach, negatively charged cellulose acetate (CA) Nanofibers fabricated by electrospinning were assembled with multilayers of poly(diallyldimethylammonium chloride) (PDADMAC) and polyacrylic acid (PAA) through electrostatic layer-by-layer assembly. The formed PAA/PDADMAC multilayers onto CA Nanofibers were then used as a nanoreactor to complex Fe(II) ions through the binding with the free carboxyl groups of PAA for subsequent reductive formation of ZVI NPs. Combined scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetry analysis studies demonstrate that the ZVI NPs are successfully synthesized and uniformly distributed into the PE multilayers assembled onto the CA Nanofibers. ...
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immobilization of zerovalent iron nanoparticles into Electrospun Polymer Nanofibers synthesis characterization and potential environmental applications
Journal of Physical Chemistry C, 2009Co-Authors: Shili Xiao, Mingwu Shen, Rui Guo, Shanyuan Wang, Xiangyang ShiAbstract:We present a facile approach to immobilizing zerovalent iron nanoparticles (ZVI NPs) into Electrospun Polymer nanofibrous mats. Electrospun poly(acrylic acid) (PAA)/poly(vinyl alcohol) (PVA) nanofibrous mats were treated at an elevated temperature to render them water stable. The water-insoluble nanofibrous mats were then used as nanoreactors to complex ferric iron for subsequent formation and immobilization of ZVI NPs. Scanning electron microscopy (SEM) studies show that the smooth, uniform morphology of the Electrospun nanofibrous mats does not significantly change after immobilization with ZVI NPs. Energy-dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and thermogravimetric analysis (TGA) were used to characterize the Polymer Nanofibers before and after the immobilization of ZVI NPs. We show that the formed ZVI NPs are uniformly distributed into the Electrospun Nanofibers with a mean partic...