纳米碳酸钙对nano-CaCO3/PES复合膜结构与性能的影响

doi:10.16085/j.issn.1000-6613.2023-1727

摘要/Abstract

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

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

中图分类号:

TQ314

王玉周, 陈增, 曹东鑫, 周杰辉, 安旭, 马天琦. 纳米碳酸钙对nano-CaCO₃/PES复合膜结构与性能的影响[J]. 化工进展, 2024, 43(11): 6310-6316.

WANG Yuzhou, CHEN Zeng, CAO Dongxin, ZHOU Jiehui, AN Xu, MA Tianqi. Effect of nano-CaCO₃ on structure and properties of nano-CaCO₃/PES composite membrane[J]. Chemical Industry and Engineering Progress, 2024, 43(11): 6310-6316.

图/表 7

图1 nano-CaCO3质量分数对铸膜液黏度的影响（70℃）

图2 不同质量分数nano-CaCO3在膜中分散情况的TEM图像

图3 不同nano-CaCO3质量分数下超滤膜的表面SEM图像

图4 不同nano-CaCO3质量分数下超滤膜的断面SEM图像

图5 不同nano-CaCO3质量分数下超滤膜的力学性能和亲水性

图6 不同nano-CaCO3质量分数对超滤膜分离性能的影响

图7 BSA溶液在纯水过滤和污染过程中膜渗透率的变化（Ⅰ、Ⅲ、Ⅴ为纯水阶段，Ⅱ、Ⅳ为污染阶段）和在纯水过滤操作中得到的膜的渗透率恢复率

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纳米碳酸钙对nano-CaCO₃/PES复合膜结构与性能的影响

Effect of nano-CaCO₃ on structure and properties of nano-CaCO₃/PES composite membrane

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