Paun Gabriela, Neagu Elena, Parvulescu Viorica, Anastasescu Mihai, Petrescu Simona, Albu Camelia, Nechifor Gheorghe, Radu Gabriel Lucian
National Institute for Research-Development of Biological Sciences, 060031 Bucharest, Romania.
"Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania.
Membranes (Basel). 2022 Jul 4;12(7):689. doi: 10.3390/membranes12070689.
This study presents the preparation of hybrid nanofiltration membranes based on poly(1,4-phenylene ether ether sulfone), polyacrylonitrile, poly(vinyl pyrrolidone), and SBA-15 mesoporous silica. Laser treatment of polymeric solutions to enhance the hydrophilicity and performance of membranes was investigated. The membranes' structure was characterized using scanning electron (SEM) and atomic force (AFM) microscopy and contact angle measurements. The addition of PAN in the casting solution produced significant changes in the membrane structure, from finger-like porous structures to sponge-like porous structures. Increased PAN concentration in the membrane composition enhanced the hydrophilicity of the membrane surface, which also accounted for the improvement in the antifouling capabilities. The permeation of apple pomace extract and the content of polyphenols and flavonoids were used to evaluate the efficacy of the hybrid membranes created. The results showed that the hybrid nanofiltration membranes based on PPEES/PAN/PVP/SBA-15: 15/5/1/1 and 17/3/1/1 exposed to laser for 5 min present a higher rejection coefficient to total polyphenols (78.6 ± 0.7% and 97.8 ± 0.9%, respectively) and flavonoids (28.7 ± 0.2% and 50.3 ± 0.4%, respectively) and are substantially better than a commercial membrane with MWCO 1000 Da or PPEES-PVP-based membrane.
本研究介绍了基于聚（1,4 - 亚苯基醚醚砜）、聚丙烯腈、聚乙烯吡咯烷酮和SBA - 15介孔二氧化硅制备混合纳滤膜的方法。研究了对聚合物溶液进行激光处理以提高膜的亲水性和性能。使用扫描电子显微镜（SEM）、原子力显微镜（AFM）和接触角测量对膜的结构进行了表征。在铸膜液中添加聚丙烯腈（PAN）使膜结构发生了显著变化，从指状多孔结构变为海绵状多孔结构。膜组合物中PAN浓度的增加提高了膜表面的亲水性，这也解释了其抗污染能力的提高。通过苹果渣提取物的渗透以及多酚和黄酮类化合物的含量来评估所制备的混合膜的功效。结果表明，基于PPEES/PAN/PVP/SBA - 15: 15/5/1/1和17/3/1/1且经5分钟激光处理的混合纳滤膜对总多酚（分别为78.6±0.7%和97.8±0.9%）和黄酮类化合物（分别为28.7±0.2%和50.3±0.4%）具有更高的截留系数，并且明显优于截留分子量为1000 Da的商业膜或基于PPEES - PVP的膜。
