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Fabrication and Characterization of Monodisperse Magnetic Porous Nickel Microspheres as Novel Catalysts.

Teng C, He J, Zhu L, Ren L, Chen J, Hong M, Wang Y - Nanoscale Res Lett (2015)

Bottom Line: The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction.The unique porous nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol.The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.

View Article: PubMed Central - PubMed

Affiliation: Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology & Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.

ABSTRACT
A facile and efficient hard-templating strategy is reported for the preparation of porous nickel microspheres with excellent uniformity and strong magnetism. The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characterized by scanning electron microscopy, X-ray powder diffraction, N2 adsorption-desorption isotherms, thermogravimetric analysis, and magnetic hysteresis measurement. The obtained porous nickel microspheres were monodispersed with a particle size of 0.91 μm and crystallite size of 52 nm. Their saturation magnetization was much higher than that of Ni nanoparticles. The unique porous nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol. The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.

No MeSH data available.


Time-dependent UV–vis spectrum of the reaction mixture for the 4-NP reduction reaction using the porous Ni microsphere as a catalyst
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Fig5: Time-dependent UV–vis spectrum of the reaction mixture for the 4-NP reduction reaction using the porous Ni microsphere as a catalyst

Mentions: After addition of NaBH4 to the 4-NP solution, UV–vis absorbance changed from 317 to 400 nm due to the formation of 4-NPate. If no porous Ni catalyst was added, the absorbance at 400 nm remain unchanged revealing no reduction of 4-NP. When our porous Ni microspheres were added, the absorbance at 400 nm gradually decreased until no absorbance after 6 h, indicating complete reduction of 4-NP (Fig. 5). The initial bright yellow solution became colorless during the reaction course. The Ni microspheres can be easily recovered with a sand-core filter. When applying an external magnetic field, the Ni microspheres promptly transported to the wall of the reaction flask (Fig. 4), and the solution became transparent and easily separable.Fig. 5


Fabrication and Characterization of Monodisperse Magnetic Porous Nickel Microspheres as Novel Catalysts.

Teng C, He J, Zhu L, Ren L, Chen J, Hong M, Wang Y - Nanoscale Res Lett (2015)

Time-dependent UV–vis spectrum of the reaction mixture for the 4-NP reduction reaction using the porous Ni microsphere as a catalyst
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593984&req=5

Fig5: Time-dependent UV–vis spectrum of the reaction mixture for the 4-NP reduction reaction using the porous Ni microsphere as a catalyst
Mentions: After addition of NaBH4 to the 4-NP solution, UV–vis absorbance changed from 317 to 400 nm due to the formation of 4-NPate. If no porous Ni catalyst was added, the absorbance at 400 nm remain unchanged revealing no reduction of 4-NP. When our porous Ni microspheres were added, the absorbance at 400 nm gradually decreased until no absorbance after 6 h, indicating complete reduction of 4-NP (Fig. 5). The initial bright yellow solution became colorless during the reaction course. The Ni microspheres can be easily recovered with a sand-core filter. When applying an external magnetic field, the Ni microspheres promptly transported to the wall of the reaction flask (Fig. 4), and the solution became transparent and easily separable.Fig. 5

Bottom Line: The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction.The unique porous nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol.The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.

View Article: PubMed Central - PubMed

Affiliation: Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology & Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.

ABSTRACT
A facile and efficient hard-templating strategy is reported for the preparation of porous nickel microspheres with excellent uniformity and strong magnetism. The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characterized by scanning electron microscopy, X-ray powder diffraction, N2 adsorption-desorption isotherms, thermogravimetric analysis, and magnetic hysteresis measurement. The obtained porous nickel microspheres were monodispersed with a particle size of 0.91 μm and crystallite size of 52 nm. Their saturation magnetization was much higher than that of Ni nanoparticles. The unique porous nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol. The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.

No MeSH data available.