Effect of calcination temperature on the structure and hydroxylation activity of Ni0.5Cu0.5Fe2O4 nanoparticles |
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| Authors: | Xiaoyan Tan Ying ZhaoGuiying Li Changwei Hu |
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| Affiliation: | a Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, PR China
b The Institute of Applied Chemistry, Central South University of Forestry and Technology, Changsha, Hunan 412006, PR China |
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| Abstract: | 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 FeB3+, CuA2+ and O on the spinel surface. The hydroxylation activity is relative to the amount of CuB2+ species on the spinel surface. The lattice oxygen species on the spinel surface are favorable for the deep oxidation of phenol. |
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| Keywords: | Nanocrystalline Ni0.5Cu0.5Fe2O4 Surface characteristics Sol-gel method XPS Hydroxylation |
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