1D Ag@Co3O4 Nanocomposite Catalysts Derived from Bimetallic Coordination Polymers†

doi:10.7503/cjcu20160199

Abstract

Abstract:

1D, magnetic Ag@Co₃O₄ nanocomposite catalysts were prepared using a synthesized precursor of bimetallic coordination polymers Co(MAA)₂/Ag(Ⅰ) nanoribbon. The structure of the obtained material was characterized by Fourier transform infrared spectroscopy(FTIR), proton nuclear magnetic resonance(¹H NMR), powder X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscope(TEM). The results suggested that both the Ag and Co₃O₄ nanocrystals distributed uniformly in the entire Ag@Co₃O₄ nanoribbon. Meanwhile, UV-Visible absorption spectrum(UV-Vis) was used to investigate the catalytic performance of Ag@Co₃O₄ nanocomposites towards the reduction of methyl blue(MB) dye by sodium borohydride(NaBH₄). The results show that the material has excellent catalytic activity, cyclic stability and magnetic separation ability.

Key words: Bimetallic coordination polymer, Ag, Co3O4, Nanocomposite material, Catalytic property

CLC Number:

O643
O631

TrendMD:

ZHANG Jiajia, CUI Fang, SHAO Qing, XU Linxu, CUI Tieyu. 1D Ag@Co₃O₄ Nanocomposite Catalysts Derived from Bimetallic Coordination Polymers^†[J]. Chem. J. Chinese Universities, 2016, 37(10): 1876.

Figures/Tables 8

Fig.1 FTIR(A) and 1H NMR(B) spectra of Co(MAA)2 nanoribbons

Fig.2 Raman spectra of Co(MAA)2(a) and Co(MAA)2/Ag(Ⅰ)(b) nanoribbons

Fig.3 SEM(A,E), TEM(B—D, F—H) images and EDX elemental mappings(I) of Co(MAA)2 nanoribbons(A—D) and Co(MAA)2/Ag(I)(E—I) nanoribbonsInsets in (A) and (E): EDS spectra of Co(MAA)2 and Co(MAA)2/Ag(Ⅰ) nanoribbons, respectively.

Fig.4 Proposed structure model of Co(MAA)2 nanoribbons

Fig.5 SEM(A), TEM(B), HRTEM(C, D) images and EDX elemental mappings(E, F) of Ag@Co3O4 nanoribbons

Fig.6 Powder XRD pattern of Ag@Co3O4 nanoribbons

Fig.7 Time-dependent UV-Vis absorption spectra of the reaction solution in the presence of Ag@Co3O4 composites(A) and UV-Vis absorption spectra of the MB in different reaction systems(B) Inset of (A): the plots of the ln(ct/c0) vs. reaction time.

Fig.8 Significant decrease in the concentration of mixture of MB and NaBH4 solution as a function of the amounts of Ag@Co3O4 composites after reaction for 5 min(A), the digital camera photo of magnetic separation(B) and values of k1 for successive reactions employing Ag@Co3O4 composites(C)

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1D Ag@Co₃O₄ Nanocomposite Catalysts Derived from Bimetallic Coordination Polymers^†

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