PDA夹层调控的荷正电纳滤膜的制备及在水处理中的应用

doi:10.11896/cldb.21090216

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Abstract At present, most commercial nanofiltration membranes show negative charge in solution, while according to the Donnan effect, positively charged nanofiltration membranes have more advantages in separating positively charged substances in wastewater. In this work, polydopamine (PDA) interlayer was constructed on MOF doped mixed matrix base membrane, and then positively charged polyamide composite nanofiltration membrane was prepared by crosslinking reaction of polyethyleneimine (PEI) and homobenzoyl chloride (TMC). The concentration and time of dopamine (DA) deposition and the addition conditions of TMC organic phase were optimized; the permeation and interception of 1 g/L MgCl₂, NaCl, MgSO₄ and Na₂SO₄ solutions by two kinds of composite nanofiltration membranes before and after the addition of PDA interlayer were compared; the treatment of heavy metal solutions containing Cu²⁺, Ni²⁺ and Pb²⁺ and five anionic and ionic dyes by the modified membrane was investigated. Finally, the pollution resistance of the membrane was evaluated. The results showed that when 2 g/L DA was deposited on the ultrafiltration support layer for 90 min, the concentration of PEI aqueous phase was 1.2%, immersion time was 7 min, the concentration of TMC organic phase was 0.5% and crosslinking time was 120 s, the comprehensive performance of the modified membrane was the best. At this time, the hydrophilicity of the modified membrane was improved, the contact angle was 51.5°, the surface roughness of the membrane decreased, and its isoelectric point is about pH=9, showed positive charge in general solution.The retention rate of MgCl₂ by the modified membrane increased to 94.26%. At 0.8 MPa, the water flux to Cu²⁺, Ni²⁺ and Pb²⁺ solutions was more than 40 L/(m²·h), and the ion retention rates were 96.57%, 95.23% and 94.73% respectively. At the same time, the rejection rate of several dyes can reach more than 90%. Therefore, the positively charged nanofiltration membrane modified by PDA interlayer has a good application prospect in wastewater.

Key words： polydopamine (PDA) polyethyleneimine (PEI) positively charged nanofiltration membrane heavy metals dyes

Published: Online: 2023-03-27

CLC number:

TQ028.8

Fund:National Natural Science Foundation of China (51864017,41662004).

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	Articles by authors
	BAO Yaqing
	HUANG Lijinhong
	LI Xindong
	HUANG Biaolin
	HUANG Wanfu

Cite this article:

BAO Yaqing,HUANG Lijinhong,LI Xindong, et al. Preparation of Positively Charged Nanofiltration Membrane Regulated by PDA Interlayer and Its Application in Water Treatment[J]. Materials Reports, 2023, 37(6): 21090216-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21090216 OR http://www.mater-rep.com/EN/Y2023/V37/I6/21090216

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