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Novel hollow α-Fe2O3 nanofibers via electrospinning for dye adsorption.

Gao Q, Luo J, Wang X, Gao C, Ge M - Nanoscale Res Lett (2015)

Bottom Line: In this work, hollow α-Fe2O3 nanofibers made of rice-like nanorods were successfully synthesized via a simple hydrothermal reaction on polyvinyl alcohol (PVA) nanofiber template followed by calcination.The crystallographic structure and the morphology of the as-prepared α-Fe2O3 nanofibers were characterized by X-ray diffraction, energy dispersive X-ray spectrometer, and scanning electron microscope.This work provided a versatile strategy for further design and development of functional nanofiber-nanoparticle composites towards various applications.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122 China ; State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200438 China.

ABSTRACT
Nanomaterials such as iron oxides and ferrites have been intensively investigated for water treatment and environmental remediation applications. In this work, hollow α-Fe2O3 nanofibers made of rice-like nanorods were successfully synthesized via a simple hydrothermal reaction on polyvinyl alcohol (PVA) nanofiber template followed by calcination. The crystallographic structure and the morphology of the as-prepared α-Fe2O3 nanofibers were characterized by X-ray diffraction, energy dispersive X-ray spectrometer, and scanning electron microscope. Batch adsorption experiments were conducted, and ultraviolet-visible spectra were recorded before and after the adsorption to investigate the dye adsorption performance. The results showed that hollow α-Fe2O3 fiber assembles exhibited good magnetic responsive performance, as well as efficient adsorption for methyl orange in water. This work provided a versatile strategy for further design and development of functional nanofiber-nanoparticle composites towards various applications.

No MeSH data available.


DSC curves of PVA nanofibers (a) as-spun, (b) after thermal treatment, and (c) coated with Fe3O4 magnetic nanoparticles.
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Fig3: DSC curves of PVA nanofibers (a) as-spun, (b) after thermal treatment, and (c) coated with Fe3O4 magnetic nanoparticles.

Mentions: Figure 3 shows the DSC curves of as-spun PVA nanofibers, PVA nanofibers after heat treatment, and PVA nanofibers coated with Fe3O4 nanoparticles. The enthalpy of 100% crystalline PVA is 138.6 J/g [26]. From Table 1, the crystallinity of as-spun PVA nanofibers is 51.4%. After heat treatment at 180°C for 5 min, the crystallinity of PVA nanofibers increased to 56.7%, which is due to the removal of H2O in the PVA matrix, so that the hydrogen bonding between PVA macromolecules is enhanced, thereby promote the crystallization. After the hydrothermal reaction for the deposition of Fe3O4 nanoparticles, the crystallinity of PVA-Fe3O4 composite decreased from 56.7% to 31.4%. Meanwhile, the melting point slightly decreased from 223°C to 222°C. During the process of hydrothermal synthesis, some water molecules squeezed into the PVA molecular chains, weakened the hydrogen bonding of -OH groups.Figure 3


Novel hollow α-Fe2O3 nanofibers via electrospinning for dye adsorption.

Gao Q, Luo J, Wang X, Gao C, Ge M - Nanoscale Res Lett (2015)

DSC curves of PVA nanofibers (a) as-spun, (b) after thermal treatment, and (c) coated with Fe3O4 magnetic nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401480&req=5

Fig3: DSC curves of PVA nanofibers (a) as-spun, (b) after thermal treatment, and (c) coated with Fe3O4 magnetic nanoparticles.
Mentions: Figure 3 shows the DSC curves of as-spun PVA nanofibers, PVA nanofibers after heat treatment, and PVA nanofibers coated with Fe3O4 nanoparticles. The enthalpy of 100% crystalline PVA is 138.6 J/g [26]. From Table 1, the crystallinity of as-spun PVA nanofibers is 51.4%. After heat treatment at 180°C for 5 min, the crystallinity of PVA nanofibers increased to 56.7%, which is due to the removal of H2O in the PVA matrix, so that the hydrogen bonding between PVA macromolecules is enhanced, thereby promote the crystallization. After the hydrothermal reaction for the deposition of Fe3O4 nanoparticles, the crystallinity of PVA-Fe3O4 composite decreased from 56.7% to 31.4%. Meanwhile, the melting point slightly decreased from 223°C to 222°C. During the process of hydrothermal synthesis, some water molecules squeezed into the PVA molecular chains, weakened the hydrogen bonding of -OH groups.Figure 3

Bottom Line: In this work, hollow α-Fe2O3 nanofibers made of rice-like nanorods were successfully synthesized via a simple hydrothermal reaction on polyvinyl alcohol (PVA) nanofiber template followed by calcination.The crystallographic structure and the morphology of the as-prepared α-Fe2O3 nanofibers were characterized by X-ray diffraction, energy dispersive X-ray spectrometer, and scanning electron microscope.This work provided a versatile strategy for further design and development of functional nanofiber-nanoparticle composites towards various applications.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122 China ; State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200438 China.

ABSTRACT
Nanomaterials such as iron oxides and ferrites have been intensively investigated for water treatment and environmental remediation applications. In this work, hollow α-Fe2O3 nanofibers made of rice-like nanorods were successfully synthesized via a simple hydrothermal reaction on polyvinyl alcohol (PVA) nanofiber template followed by calcination. The crystallographic structure and the morphology of the as-prepared α-Fe2O3 nanofibers were characterized by X-ray diffraction, energy dispersive X-ray spectrometer, and scanning electron microscope. Batch adsorption experiments were conducted, and ultraviolet-visible spectra were recorded before and after the adsorption to investigate the dye adsorption performance. The results showed that hollow α-Fe2O3 fiber assembles exhibited good magnetic responsive performance, as well as efficient adsorption for methyl orange in water. This work provided a versatile strategy for further design and development of functional nanofiber-nanoparticle composites towards various applications.

No MeSH data available.