Abstract:

Nano-CaCO₃/PES composite membrane was prepared by non-solvent induced phase separation (NIPS) technology to understand the morphology, mechanical properties, hydrophilicity, separation properties and anti-fouling properties of nano-CaCO₃/PES composite membrane. The morphology, physical chemistry properties and separation properties of the composite membranes were characterized. The effects of nano-CaCO₃ weight fraction on the structure and properties of the membranes were investigated. The results showed that nano-CaCo₃ could effectively optimize the structure of the membrane, and simultaneously improve the physical chemistry performance and separation efficiency. When nano-CaCO₃ weight fraction was 0.3%, the mechanical strength of the composite membrane was 3.8MPa. Compared to pure PES materials, the mechanical strength was increased by 65%. The hydrophilicity was also improved. The permeability of pure water was 450L/(m²·h·bar) (1bar=10⁵Pa), which was increased by 1.7 times. At the same time, the retention rate of BSA was over 99% and the anti-pollution property of BSA was improved from 48.8% to 77.1% , which had good anti-pollution effect. The present study offered a highly effective and straightforward approach to optimize membrane structure and enhance membrane performance, thereby holding significant practical application value.

Key words: nano-CaCO₃, dispersity, composite membrane, mechanical properties, separation performance, anti-fouling performance

摘要：

为深入了解nano-CaCO₃/PES复合膜的形态结构、力学性能、亲水性、分离性能和抗污染性能，通过非溶剂诱导相分离（NIPS）技术制备了nano-CaCO₃/PES复合膜。对复合膜的形态结构和物理化学性能以及分离性能进行了表征，重点考察了nano-CaCO₃质量分数对膜结构与性能的影响。结果说明了nano-CaCO₃在膜中均匀分散时，可有效优化膜结构，并同步提升膜的物理化学性能，提高分离效率。当nano-CaCO₃质量分数为0.3%时，所得到的复合膜机械强度为3.8MPa；对比纯PES材料，其机械强度增加了65%；亲水性也有效改善，纯水渗透性为450L/(m²·h·bar)（1bar=10⁵Pa），提高了1.7倍，同时保持99%以上的BSA截留率；对BSA抗污性能从48.8%显著提高至77.1%，具有良好的抗污染效果。本项研究为优化膜结构、提升膜性能方面提供了一个高效、简便的方法，在实际应用中具有重要的价值。

关键词: 纳米碳酸钙, 分散性, 复合滤膜, 力学性能, 分离性能, 抗污染性能