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Preparation of high performance polysulfonamide acid-stable nanofiltration composite membranes

Authors： Xue Yujie, Wu Bixin, Yao Dongxue, Gao Huiihui, Meng Jianqiang

Units： State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： thin film composite membrane; polysulfonamide; nanofiltration membrane; salt rejection; acid-stable; interlayer

ClassificationCode：TB324

year,volume(issue):pagination： 2022,42(6):77-86

Abstract：

Polysulfonamide (PSA) is a classic acid-stable membrane materials. The flux of PSA membranes prepared by traditional interfacial polymerization is low, which often hinders its application. PSA composite membranes were prepared by interfacial polymerization with polysulfone (PSF) commercial membranes as substrate membranes, tannic acid/iron (TA/Fe) as interlayer, 1,6-hexanediamine (HDA) as aqueous phase monomer and 1,3,6-naphthalene trisulfonyl chloride (NTSC) as organic phase monomer. The structure and morphology of membranes were characterized by XPS, SEM and AFM. The results show that the continuous defect-free PSA layer could be prepared at lower monomer concentration by introducing the interlayer, which reduced the thickness and surface roughness of PSA layer. The water flux of PSF-TA/Fe-PSA membrane was 18±1.2 L/m2 h and the rejection was 99.1±0.1 % under 1 MPa and 25°C for 1000 ppm Na2SO4 solution, its performance is significantly higher than PSA membranes without interlayer (the flux was 5.4±0.3 L/m2 h; Na2SO4 rejection was 93.3±1.6%). The TA/Fe interlayer restricts the amine monomer diffusion and the growth of microstructures of PSA surface bumps, rendering the PSA layer thinner and smoother. The acid immersion experiment showed that PSF-TA/Fe-PSA membrane could still maintain excellent nanofiltration performance after 24 hours immersion in 20 w/v% H2SO4.

Funds：

国家自然科学基金（22075206, 21875162）

AuthorIntro：

薛玉杰（1996-），女，山东济宁，硕士研究生，研究方向为纳滤膜制备及工艺研究

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