Abstract In this study, a hydrophobic porous organic polymer (PP) synthesized via Friedel-Crafts alkylation of dichloro-p-xylene, was functionalized with hydrophilic sulfonate functional group to form PP-SO3H, prior to incorporation into the polyamide layer of a hollow fiber pressure retarded osmosis (PRO) TFN membrane. Sulfonate functionalization of the PP material improved the compatibility of the nanomaterial with the aqueous amine precursor during the in situ interfacial polymerization, leading to a decrease in aggregation of the nanoparticles. The effect of nanomaterial loading on the membranes' performance was also elucidated. PP-SO3H incorporation resulted in significant improvement of surface hydrophilicity, which along with improved porosity, facilitated enhanced water transport across the membrane and maintained an acceptable salt rejection of the selective layer. The best-performing membrane with PP-SO3H loading of 0.002 wt% showed a 46.3 L m−2 h−1 water flux and power density of 14.6 W m−2, which are both the highest values recorded. This study suggests that the functionality and chemical properties of the nanomaterial in a TFN membrane is essential in improving altogether the osmotic performance and salinity gradient power harvesting capability during PRO.

中文翻译：

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磺酸盐官能化多孔聚合物掺入薄膜纳米复合膜增强水渗透性和渗透发电

摘要 在这项研究中，通过二氯对二甲苯的 Friedel-Crafts 烷基化合成的疏水性多孔有机聚合物 (PP) 用亲水性磺酸盐官能团官能化形成 PP-SO3H，然后再掺入中空纤维的聚酰胺层中。压力延迟渗透 (PRO) TFN 膜。在原位界面聚合过程中，PP 材料的磺酸盐官能化提高了纳米材料与水性胺前体的相容性，从而减少了纳米颗粒的聚集。还阐明了纳米材料负载对膜性能的影响。PP-SO3H 的掺入显着提高了表面亲水性，同时提高了孔隙率，促进增强的水跨膜传输并保持选择性层的可接受的盐截留率。PP-SO3H 负载量为 0.002 wt% 的性能最佳的膜显示出 46.3 L m-2 h-1 的水通量和 14.6 W m-2 的功率密度，这两个值都是记录的最高值。这项研究表明，TFN 膜中纳米材料的功能和化学性质对于提高 PRO 过程中的渗透性能和盐度梯度能量收集能力至关重要。