溶液特性及共存物对纳滤膜去除水中全氟辛酸的影响

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Abstract Polyamide composite nanofiltration (NF) membrane was used to remove persistent organic pollutant-perfluorooctanoate acid (PFOA) from water. This research investigated the influence of PFOA concentration, ionic strength, pH value, typical macromolecular organic matter-bovine serum albumin (BSA), and the coexistence of BSA and Na⁺ in feed solution on PFOA rejection, respectively. The filtration experiments were conducted at an operating pressure of 0.8MPa for 24h. Results showed that the retention of PFOA increased with increasing PFOA concentration. The higher the ionic strength or pH of the feed solution, the higher the rejection rate of PFOA was. When BSA presented in PFOA feed solution, BSA could not only block some membrane pores, but also form an organic fouling layer on the membrane surface which increased the negative charge of the membrane surface. Thus, both size exclusion and electrostatic repulsion abilities of the NF membrane were enhanced. When BSA coexisted with Na⁺ in the feed water, the pore blocking degree of the NF membrane was more serious. The presence of Na⁺ made the organic fouling layer much thicker. Therefore, the sieving capacity of the NF membrane was enhanced.

Key words： perfluorooctanoate acid polyamide composite nanofiltration membrane solution characteristics bovine serum albumin inorganic ions

Received: 21 July 2021

PACS:

X703.5

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	WANG Jia-xuan
	HU Yu-ning
	YUE Xiang-lei
	WANG Lei
	LIU Zhe

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WANG Jia-xuan,HU Yu-ning,YUE Xiang-lei等. Effects of solution characteristics and coexisted substances on the removal of perfluorooctanoic acid from water by nanofiltration membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 665-671.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/665

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