Burts Katsiaryna S, Plisko Tatiana V, Penkova Anastasia V, Yuan Bingbing, Ermakov Sergey S, Bildyukevich Alexandr V
Department of Analytical Chemistry, Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia.
Key Laboratory of Green Chemical Media and Reactions Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China.
Polymers (Basel). 2025 Apr 28;17(9):1199. doi: 10.3390/polym17091199.
Correlations between conditions of the polyaniline (PANI) interlayer formation on the surface of a polysulfone (PSF) porous membrane substrate and the structure and performance of thin-film composite (TFC) membranes for nanofiltration with a polyamide (PA) selective layer prepared via interfacial polymerization (IP) were studied. It was shown that application of the PANI layer significantly enhanced hydrophilicity (the water contact angle decreased from 55 ± 2° down to 26-49 ± 2°), decreased pore size and porosity, and increased the surface roughness of the selective layer surface of porous PSF/PANI membrane substrates due to the formation of bigger PANI globules, which affect the formation of the PA layer of TFC membranes via IP. It was shown that the application of the PANI intermediate layer yielded the formation of a thinner PA selective layer, a decline in surface roughness, and an increase in hydrophilicity (the water contact angle declined from 28 to <10°) and crosslinking degree of the selective layer of TFC NF membranes. The developed approach allows us to enhance the water permeation up to 45-64 L·m·h at ΔP = 0.5 MPa and improve membrane selectivity (rejection coefficient of MgSO->99.99%; LiCl-5-25%; sulfadimetoxine-80-95%) and also ensure enhanced long-term operational stability of TFC nanofiltration membranes with a PANI interlayer. Moreover, Mg/Li separation factor values were found to increase to 37 and 58 for PANI-modified membranes compared to 9 and 8 for the reference NF-PSF membranes.
研究了聚砜（PSF）多孔膜基材表面聚苯胺（PANI）中间层形成条件与通过界面聚合（IP）制备的具有聚酰胺（PA）选择层的纳滤复合薄膜（TFC）膜的结构和性能之间的相关性。结果表明，PANI层的应用显著提高了亲水性（水接触角从55±2°降至26 - 49±2°），减小了孔径和孔隙率，并由于形成了更大的PANI球粒而增加了多孔PSF/PANI膜基材选择层表面的粗糙度，这通过IP影响了TFC膜PA层的形成。结果表明，PANI中间层的应用导致形成了更薄的PA选择层，表面粗糙度降低，亲水性增加（水接触角从28°降至<10°）以及TFC纳滤膜选择层的交联度增加。所开发的方法使我们能够在ΔP = 0.5 MPa时将水通量提高到45 - 64 L·m⁻²·h⁻¹，并提高膜的选择性（MgSO₄的截留系数>99.99%；LiCl - 5 - 25%；磺胺二甲氧嘧啶 - 80 - 95%），还能确保具有PANI中间层的TFC纳滤膜具有更高的长期运行稳定性。此外，发现PANI改性膜的Mg/Li分离因子值增加到37和58，而参考NF - PSF膜的分离因子值为9和8。
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