Synthesis of Active MFe2O4/γ-Fe2O3 Nanocomposites (Metal = Ni or Co) for Reduction of Nitro-Containing Pollutants and Methyl Orange Degradation

被引：51
作者：
El-Subruiti, G. M. [1 ]
Eltaweil, A. S. [1 ]
Sallam, S. A. [1 ]
机构：
[1] Alexandria Univ, Chem Dept, Fac Sci, Alexandria, Egypt
来源：
NANO | 2019年 / 14卷 / 10期
关键词：
Nickel ferrite; maghemite; catalytic reduction; methyl orange; FIBROUS NANO-SILICA; CATALYTIC-REDUCTION; FACILE SYNTHESIS; P-NITROPHENOL; MAGNETIC-PROPERTIES; ORGANIC POLLUTANTS; HIGHLY EFFICIENT; GREEN SYNTHESIS; IRON-OXIDE; AZO DYES;
D O I：
10.1142/S179329201950125X
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Metal-ferrite/maghemite nanocomposites (NiFe2O4/***gamma-Fe2O3 and CoFe2O4/7-Fe2O3) were synthesized via doping maghemite with metal salt (NiCl2 or CoCl2) followed by reduction of metal ions using NaBH4. The synthesized metal-ferrite/maghemite nanocomposites were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared (FTIR) and the amounts of the dopant-metal (Ni/Co) were determined using ICP-OES technique. Results showed that this synthetic route produced nanocomposites with highly active ferrite phases MFe2O4. The synthesized nanocomposites exhibited exceptional catalytic activities for the reduction of 4-nitrophenol and 2-nitroaniline as well as the catalytic degradation of methyl orange. Specific activity parameter of NiFe2O4/gamma-Fe2O3 and CoFe2O4/gamma-Fe2O3 toward reduction of 4-NP reached 993.9 and 929.8 s(-1) g(metal)(-1), respectively. These high values of specific activities are higher than most reported metal-ferrite composites prepared via traditional co-precipitation methods. Besides, strong magnetic properties of the prepared metal-ferrite/maghemites facilitates easy separation process for several reuses.
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页数：12
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