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Structural Magnetic and Catalytic Evaluation ofSpinel Co Ni and Co–Ni Ferrite Nanoparticles Fabricated byLow-Temperature Solution Combustion Process

机译:的结构磁性和催化评估尖晶石CoNi和Co-Ni铁氧体纳米粒子的制备低温溶液燃烧过程

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摘要

Here, we present the low-temperature (∼600 °C) solution combustion method for the fabrication of CoFe2O4, NiFe2O4, and Co0.5Ni0.5Fe2O4 nanoparticles (NPs) of 12–64 nm range in pure cubic spinel structure, by adjusting the oxidant (nitrate ions)/reductant (glycine) ratio in the reaction mixture. Although nitrate ions/glycine (N/G) ratios of 3 and 6 were used for the synthesis, phase-pure NPs could be obtained only for the N/G ratio of 6. For the N/G ratio 3, certain amount of Ni2+ cations was reduced to metallic nickel. The NH3 gas generated during the thermal decomposition of the amino acid (glycine, H2NCH2COOH) induced the reduction reaction. X-ray diffraction (XRD), Raman spectroscopy, vibrating sample magnetometry, and X-ray photoelectron spectroscopy techniques were utilized to characterize the synthesized materials. XRD analyses of the samples indicate that the Co0.5Ni0.5Fe2O4 NPs have lattice parameter larger than that of NiFe2O4, but smaller than that of CoFe2O4 NPs. Although the saturation magnetization (Ms) of Co0.5Ni0.5Fe2O4 NPs lies in between the saturation magnetization values of CoFe2O4 and NiFe2O4 NPs, high coercivity (Hc, 875Oe) of the NPs indicate their hard ferromagnetic behavior. Catalyticbehavior of the fabricated spinel NPs revealed that the samples containingmetallic Ni are active catalysts for the degradation of 4-nitrophenolin aqueous medium.
机译:在这里,我们介绍了一种低温(〜600°C)溶液燃烧方法,用于通过制备纯立方尖晶石结构制备12–64 nm范围内的CoFe2O4,NiFe2O4和Co0.5Ni0.5Fe2O4纳米颗粒(NPs)。反应混合物中氧化剂(硝酸根离子)/还原剂(甘氨酸)的比例。虽然使用3和6的硝酸根离子/甘氨酸(N / G)比率进行合成,但仅当N / G比率为6时才能获得纯相NP。对于N / G比率3,一定量的Ni 2 + 阳离子被还原为金属镍。氨基酸(甘氨酸,H2NCH2COOH)热分解过程中产生的NH3气体引起还原反应。利用X射线衍射(XRD),拉曼光谱,振动样品磁力分析和X射线光电子能谱技术来表征合成材料。样品的X射线衍射分析表明,Co0.5Ni0.5Fe2O4 NPs的晶格参数大于NiFe2O 4 ,但小于CoFe 2 O 4。 NP。尽管Co 0.5 Ni 0.5 Fe 2 O 4 的饱和磁化强度(M s ) sub> NP位于CoFe 2 O 4 和NiFe 2 O 4 NP的饱和磁化强度之间,高矫顽力(H c ,875NP的Oe)表明其硬铁磁行为。催化尖晶石NPs的行为表明样品中含有金属镍是降解4-硝基苯酚的活性催化剂在水性介质中。

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