Fe3O4基核壳纳米结构材料的制备及顺磁性研究

doi:10.3969/j.issn.2097-2806.2024.03.008

Abstract

Abstract:

Fe₃O₄@SiO₂ core-shell nanostructured materials were prepared with Fe₃O₄ as magnetic core and SiO₂ as shell. Surface hydrophilic modification of Fe₃O₄@SiO₂ was carried out with triethoxysilane. The effects of hydrophilic modification on its paramagnetism and catalytic properties were studied. The results showed that Fe₃O₄ with cubic structure was the main crystal phase in the core-shell materials. The SiO₂ at surface was amorphous, and the crystal structure of Fe₃O₄@SiO₂ remained unchanged after surface hydrophilic modification. The Fe₃O₄@SiO₂ material was irregular particles of 80-110 nm, in which the Fe₃O₄ was coated with SiO₂. The saturated magnetization of the Fe₃O₄@SiO₂ after hydrophilic treatment was reduced to 20.31 emu/g, indicative of superparamagnetism. This nanomaterial was applied to the wastewater containing Cd²⁺ for adsorption and degradation, where the removal rate was increased to 94.2%. The second-order kinetic model was more suitable for the adsorption of Cd²⁺ with Fe₃O₄@SiO₂, and the correlation coefficient of the model was 0.994 3, showing good fitting. The results showed that the adsorption rate of Cd²⁺ by Fe₃O₄@SiO₂ was greatly affected by chemisorption.

Key words: Fe₃O₄, SiO₂, core-shell structure, paramagnetic performance, cadmium ion, adsorption

CLC Number:

TQ032

Keyun Hu. Preparation and paramagnetic study of Fe₃O₄-based core-shell nanostructured materials[J].China Surfactant Detergent & Cosmetics, 2024, 54(3): 298-304.

Figures/Tables 12

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References 19

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试样	BET surface area/ （m²/g）	Pore volume/（cm³/g）	Average BJH pore diameter/nm
Fe₃O₄	84	0.175	60.5
Fe₃O₄@SiO₂	121	0.247	63.0
TES-Fe₃O₄@SiO₂	138	0.182	63.5

q_e^exp/（mg/g）	一级动力学				二级动力学
q_e^exp/（mg/g）	K₁/min^-1	q_e^cal/（mg/g）	R²		K₂/（g·（mg·min））	q_e^cal/（mg/g）	R²
9.082	0.041 58	8.852	0.760 6		0.021 81	9.250	0.994 3

Preparation and paramagnetic study of Fe₃O₄-based core-shell nanostructured materials

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Preparation and paramagnetic study of Fe3O4-based core-shell nanostructured materials

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Preparation and paramagnetic study of Fe₃O₄-based core-shell nanostructured materials