Preparation of Positively Charged Nanofiltration Membrane Regulated by PDA Interlayer and Its Application in Water Treatment
BAO Yaqing1, HUANG Lijinhong2, LI Xindong1, HUANG Biaolin3, HUANG Wanfu3,*
1 School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 2 School of Architecture and Design Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 3 School of Resource and Environmental Engineering,Jiangxi Unviersity of Science and Technology,Ganzhou 341000, Jiangxi, China
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.
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