Magnetic flocculation of kaolin suspension using magnetic materials functionally regulated with plant polyphenols

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

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6435-6444.

Water Pollution Control

Magnetic flocculation of kaolin suspension using magnetic materials functionally regulated with plant polyphenols

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

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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.

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DLVO theory / Fe₃O₄ / kaolin particles / magnetic flocculation / plant polyphenol

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LIU Chuang, DU Si-cong, CHENG Peng, LIANG Wen-yan. Magnetic flocculation of kaolin suspension using magnetic materials functionally regulated with plant polyphenols[J]. China Environmental Science. 2023, 43(12): 6435-6444

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