期刊
APPLIED SURFACE SCIENCE
卷 257, 期 14, 页码 6256-6263出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.02.056
关键词
Nanocrystalline Ni0.5Cu0.5Fe2O4; Surface characteristics; Sol-gel method; XPS; Hydroxylation
类别
资金
- National Natural Science Foundation of China [20072024, 20502017]
- PCRIRT [IRT0846]
- Analytical and Testing Center of Sichuan University
Nanocrystalline Ni0.5Cu0.5Fe2O4 was synthesized by sol-gel method with varying calcination temperature over the range of 500-1000. The powders obtained were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). In addition, thermal analysis (TG-DTG-DTA) of the precursor was carried out. The study reveals the simultaneous decomposition and ferritization process at rather low temperature (280-350). For the crystalline structure investigated, single cubic spinel is gained when the precursor was decomposed at 800-1000, whereas separated crystal CuO formed when calcination temperature is below 800. The increase of calcination temperature favors the appearance of Fe-B(3+), Cu-A(2+) and O on the spinel surface. The hydroxylation activity is relative to the amount of Cu-B(2+) species on the spinel surface. The lattice oxygen species on the spinel surface are favorable for the deep oxidation of phenol. (C) 2011 Elsevier B. V. All rights reserved.
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