Improvement of permeability and rejection of an acid resistant polysulfonamide thin-film composite nanofiltration membrane by a sulfonated poly(ether ether ketone) interlayer
Improvement of permeability and rejection of an acid resistant polysulfonamide thin-film composite nanofiltration membrane by a sulfonated poly(ether ether ketone) interlayer
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DOI：
10.1016/j.seppur.2020.116528
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发表时间：
2020-05
影响因子：
8.6
通讯作者：
Ye Zhu;Pengjia Dou;Hailong He;Hongling Lan;Shan Xu;Yuebiao Zhang;T. He;J. Niu
中科院分区：
文献类型：
--
作者：
Ye Zhu;Pengjia Dou;Hailong He;Hongling Lan;Shan Xu;Yuebiao Zhang;T. He;J. Niu
耐酸纳滤膜在矿山、钢铁、电镀等行业的废酸处理中有着很高的需求。本研究以磺化聚醚醚酮（SPEEK）为中间层聚合物，采用界面聚合法制备了耐酸型聚磺酰胺（PSA）薄膜复合材料（TFC）纳滤膜。以二乙烯三胺（DETA）和萘-1,3,6-三磺酰氯（NTSC）为单体进行反应。SPEEK介导的纳滤膜的负电荷明显高于无中间层的纳滤膜。观察到对二价阴离子的高排斥，其次是对二价阳离子的低排斥。观察了SPEEK夹层PSA - NF膜在长时间加压试验中的结构稳定性和酸性稳定性。扫描电镜、能量色散x射线能谱、原子力显微镜和光谱椭偏仪分析表明，在极薄的亲水性SPEEK涂层后制备了极薄光滑的PSA活性层。性能和形貌的变化主要是由于亲水性的改善，单体在水相DETA中渗透到PSF的孔隙中，以及单体向界面扩散进行界面聚合的改善。具有SPEEK中间层的PSA纳滤膜具有光滑的薄活性层，水通量为17.4 L·m−2·h−1，在10 bar时的na2so4截留率为99.7%，显著高于无中间层的PSA纳滤膜。SPEEK在控制界面聚合过程中的优异性能为制备性能增强的纳滤膜提供了新的候选材料。
Acid resistant nanofiltration membranes are highly demanded for waste acid management in various industries, such as mining, steel, electroplating etc. In this study, sulfonated poly(ether ether ketone) (SPEEK) was introduced as a new interlayer polymer for preparing an acid-stable polysulfonamide (PSA) thin-film composite (TFC) nanofiltration membrane by interfacial polymerization. Diethylenetriamine (DETA) and naphthalene-1,3,6-trisulfonylchloride (NTSC) were used as monomers in reaction. SPEEK mediated nanofiltration membranes showed significantly higher negative charges than the membrane with no interlayer. High rejection for bivalent anions was observed followed by low rejection to bivalent cations. Structural stability during a long time pressurized test and acid stability were observed for PSA NF membranes with SPEEK interlayer. Analysis by scanning electron microscopy, energy dispersive X-Ray spectroscopy, atomic force microscopy and spectroscopic ellipsometer indicated that a very thin and smooth PSA active layer was prepared after a very thin hydrophilic SPEEK coating. The performance and morphology change was attributed to the improvement in hydrophilicity, blockage of monomer in water phase DETA from penetration into the pores of PSF and improvement of the diffusion of monomers to the interface for interfacial polymerization. The PSA nanofiltration membranes with SPEEK interlayer showed a smooth thin active layer and water flux (17.4 L·m−2·h−1) and a 1000 mg/L Na2SO4rejection (99.7%) at 10 bar, which is significantly higher than the membrane without interlayer. The excellent performance of SPEEK in controlling the interfacial polymerization process adds a new candidate for preparing nanofiltration membranes with enhanced performance.