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Fabrication and salt fractionation performance of nanofiltration membrane with high perm-selectivity

Authors： DING Huahong, ZHENG Tong, GE Yuhang, LIU Meihong, YU Sanchuan

Units： 1. Hangzhou Creflux Membrane Technology Co., Ltd. Hangzhou, 311121, China. 2. School of Science, Zhejiang Sci-Tech University, Hangzhou, 310018, China.

KeyWords： Nanofiltration membrane; Interfacial polymerization; Perm-selectivity; Sodium sulfate removal; Concentrated brine

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(2):103-109

Abstract：

In this study, the physico-chemical and performance properties of nascent polyamide (PA) thin-film composite membrane were tuned via secondary interfacial reaction with tannic acid (TA) as the reactive material. Composite membrane with high perm-selectivity was fabricated through investigating the effects of secondary interfacial reaction on membrane property and separation performance. The results indicated that TA molecules deposited densely onto the surface of the PA-based nascent TFC membrane through esterification reaction between their phenolic hydroxyl groups and the residual acyl chloride groups. Compared with the PA layer, the PA-TA layer showed decreased mean pore size, narrowed pore size distribution and intensified surface negative charge. The desired PA-TA membrane possessed a low molecular weight-cut off of around 210 g/mol, pure water permeability of 120 L/(m2·h·MPa), Na2SO4 rejection of 99.3 % and NaCl rejection of 60.2 % to 0.5 g/l aqueous solution under 0.5 MPa. The PA-TA membrane also exhibited an average Na2SO4 rejection above 98.5%, water flux of about 120 L/(m2·h·MPa), and almost no NaCl rejection to concentrated brine of 200 g/L NaCl and 10.0 g/L Na2SO4under 3.0 MPa, 40.0 ℃ and a concentrating factor of 5. The separation performance of PA-TA membrane to concentrated brine was better than that of commercial membrane NF270.

Funds：

浙江省重点研发计划项目（2021C03172，2020C03080）、国家自然科学基金项目（21978275）

AuthorIntro：

丁华烘（1974.03），男，浙江杭州人，工程师，从事纳滤膜材料的制备及应用研究

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