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

摘要/Abstract

摘要：

以Fe₃O₄为磁核，SiO₂为外壳，制备了Fe₃O₄@SiO₂核壳纳米结构材料，使用三乙氧基硅烷对Fe₃O₄@SiO₂进行表面亲水改性，研究了亲水改性对Fe₃O₄@SiO₂顺磁性能和催化性能的影响。结果表明：立方相结构的Fe₃O₄是核壳材料中主要的晶体相，表面的SiO₂为非晶态，表面亲水处理后未改变Fe₃O₄@SiO₂的晶格结构，Fe₃O₄@SiO₂为80~110 nm的不规则颗粒状，SiO₂包覆在Fe₃O₄外部，亲水处理后改善了颗粒的分布均匀性。亲水处理的Fe₃O₄@SiO₂的饱和磁化强度降低至20.31 emu/g，具有超顺磁性。以含Cd²⁺的金属废水为吸附降解对象，表面亲水处理后的Fe₃O₄@SiO₂去除率提高至94.2%，二级动力学模型更适合于Fe₃O₄@SiO₂对Cd²⁺的吸附，模型的相关系数为0.994 3，拟合效果更好，表明了Fe₃O₄@SiO₂对Cd²⁺的吸附速率受化学吸附的影响较大。

关键词: 四氧化三铁（Fe₃O₄）, 二氧化硅（SiO₂）, 核壳结构, 顺磁性能, 镉离子, 吸附

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

中图分类号:

TQ032

胡可云. Fe₃O₄基核壳纳米结构材料的制备及顺磁性研究[J]. 日用化学工业（中英文）, 2024, 54(3): 298-304.

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

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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

Fe₃O₄基核壳纳米结构材料的制备及顺磁性研究

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

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