表面活性剂改性的磁性纳米颗粒对重金属吸附特征

doi:10.11896/cldb.23090040

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Abstract Fe₃O₄@SDS, Fe₃O₄@CTAB, Fe₃O₄@SNC 16, and Fe₃O₄@NPC 16 (collectively called “Fe₃O₄@surfactants”) nanoparticles with good adsorption properties were prepared in this work by surface modification of ferric oxide using four kinds of surfactants differing in charge pola-rity, i.e., SDS (anionic surfactant), CTAB (cationic surfactant), and SNC 16 and NPC 16 (amphoteric surfactants). The prepared magnetic nanoparticles were characterized by means of XRD, TEM, FTIR, vibrating-sample magnetometry (VSM), and XPS. The effects of surfactant modification on the performance of magnetic Fe₃O₄ for adsorbing As(Ⅲ) were investigated by adsorption kinetics, adsorption isotherms, and adsorption thermodynamics. The prepared Fe₃O₄@surfactants particles were approximately spherical, with average particle sizes of around 10 nm. All the Fe₃O₄@surfactants had saturation magnetizations larger than 70 emu·g^-1, making them magnetically separable from solutions. The adsorption processes of As(Ⅲ) by Fe₃O₄@surfactants could reach equilibrium within 60 min, and corresponded well with the pseudo-second order kinetic model and the Freundlich isotherm expression, indicating the mechanisms of chemisorption-dominant multi-molecular-layer adsorption. Under the same conditions, Fe₃O₄@CTAB showed the highest adsorption capacity for As(Ⅲ) (55.174 mg/g), largely superior to the other Fe₃O₄@surfactants, and could maintain 85% of its initial As(Ⅲ) removal efficiency after five cycles of reuse. This study provides technical support for developing novel magnetically separable nano-sorbent materials effective in removing As(Ⅲ) from water.

Key words： triiron tetraoxide surfactant trivalent arsenic nanomaterial adsorption

Published: 25 March 2025 Online: 2025-03-24

CLC number:	TB321
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	SHI Hao
	WANG Ya
	ZHAO Yuling
	LUO Yanli
	YANG Fangyuan
	ZHOU Jinlong

Cite this article:

SHI Hao,WANG Ya,ZHAO Yuling, et al. Study on the Adsorption Characteristics of Heavy Metal by Surfactant-modified Magnetic Nanoparticles[J]. Materials Reports, 2025, 39(6): 23090040-8.

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https://www.mater-rep.com/EN/10.11896/cldb.23090040 OR https://www.mater-rep.com/EN/Y2025/V39/I6/23090040

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