利用Fe<sub>3</sub>O<sub>4</sub>纳米颗粒磁分离去除水中小粒径微塑料

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Abstract In this study, we developed a fluorescence quantitative analysis method to detect the concentration of Microplastics (MPs), and studied the removal of polystyrene MPs with Fe₃O₄ nanoparticles by magnetic separation in water. Results showed that the concentration of MPs (0.2~10.0mg/L) had a good linear relationship with fluorescence intensity and the correlation coefficients were all greater than 0.9990, indicating its feasibility to accurately determine MPs concentrations with different particle sizes (100~1000nm). The initial concentration of MPs and the dose of Fe₃O₄ nanoparticles had influence on the removal of MPs. Increasing the dose of Fe₃O₄ nanoparticles could obviously improve the removal efficiency of MPs in water. When the dose of Fe₃O₄ was 12mg/L, the removal efficiency could reach 90.8%. When the dose of Fe₃O₄ was low, the removal efficiency of MPs increased significantly with the increase of the initial concentration of MPs and the significance level was 0.015. However, when the dose of Fe₃O₄ was medium or high, the initial concentration had little influence on the removal effect, and the significance level was 0.073 and 0.060, respectively. The adhesion process of Fe₃O₄ nanoparticles to the MPs tended to equilibrium within 180 min, and the dynamics could be fitted using a quasi-first-order or quasi-second-order kinetic model.

Key words： magnetic nanoparticles microplastics magnetic separation removal polystyrene

Received: 08 January 2021

PACS:

X703

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	Articles by authors
	JIANG Wei-nan
	SUI Qian
	Lü Shu-guang

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JIANG Wei-nan,SUI Qian,Lü Shu-guang. Removal of small-sized microplastics from aqueous solution with Fe₃O₄ nanoparticles by magnetic separation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3601-3606.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3601

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