Indexed by:
Journal Papers
First Author:
Li, Mo
Correspondence Author:
Li, XC (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, R&D Ctr Membrane Sci & Technol, Sch Chem Engn, Dalian 116024, Peoples R China.
Co-author:
Li, Xiangcun,Qi, Xinhong,Luo, Fan,He, Gaohong
Date of Publication:
2015-05-12
Journal:
LANGMUIR
Included Journals:
SCIE、EI、Scopus
Document Type:
J
Volume:
31
Issue:
18
Page Number:
5190-5197
ISSN No.:
0743-7463
Abstract:
The preparation of nonspherical magnetic core-shell nanostructures with uniform sizes still remains a challenge. In this study, magnetic iron oxide@SiO2-Au@C particles with different shapes, such as pseduocube, ellipsoid, and peanut, were synthesized using hematite as templates and precursors of magnetic iron oxide. The as-obtained magnetic particles demonstrated uniform sizes, shapes, and well-designed core-shell nanostructures. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) analysis showed that the Au nanoparticles (AuNPs) of similar to 6 nm were uniformly distributed between the silica and carbon layers. The embedding of the metal nanocrystals into the two different layers prevented the aggregation and reduced the loss of the metal nanocrystals during recycling. Catalytic performance of the peanut-like particles kept almost unchanged without a noticeable decrease in the reduction of 4-nitrophenol (4-NP) in 8 min even after 7 cycles, indicating excellent reusability of the particles. Moreover, the catalyst could be readily recycled magnetically after each reduction by an external magnetic field.
Translation or Not:
no
