植物多酚功能化调控磁性材料磁絮凝高岭土悬浊液

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Abstract Plant polyphenol (PP) was used as a functional regulating ligand in preparation of Fe₃O₄@PP magnetic composite via in-situ self-assembly, which was applied in magnetic flocculation of kaolin suspension. The morphology of Fe₃O₄@PP was observed with SEM. The effects of Ca²⁺ ions, alkalinity, and humic acid concentration on flocculation performance of Fe₃O₄@PP were studied. The morphology and structural features of magnetic flocs during growth and breakage were observed using optical microscopy. The interaction mechanism between Fe₃O₄@PP and kaolin particles was investigated with the extended DLVO theory. The results showed that Fe₃O₄@PP had excellent dispersibility, chemical stability, and flocculation performance, which could overcome the interference of alkalinity and humic acid, achieving a maximum turbidity removal efficiency of 96.4%. During magnetic flocculation, magnetic flocs gradually became denser and formed long-chain aggregates with good resistance to breakage. The analysis of interaction energy indicated that magnetic force dominated the entire flocculation process. The total interaction potential and effective distance of magnetic force were three orders of magnitude higher than electrostatic and van der Waals forces. Furthermore, the total interaction energy was also affected by the properties of the suspension, such as pH value, Ca²⁺ ion concentration, and ion species.

Key words： magnetic flocculation Fe₃O₄ plant polyphenol DLVO theory kaolin particles

Received: 15 May 2023

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X703

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	LIU Chuang
	DU Si-cong
	CHENG Peng
	LIANG Wen-yan

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LIU Chuang,DU Si-cong,CHENG Peng等. Magnetic flocculation of kaolin suspension using magnetic materials functionally regulated with plant polyphenols[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6435-6444.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I12/6435

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