凝固浴组成对SMA/CPVC共混超滤膜的结构与性能影响

doi:10.16085/j.issn.1000-6613.2020-0861

摘要/Abstract

摘要：

通过非溶剂致相分离（NIPS）法制备了苯乙烯-马来酸酐共聚物（SMA）/氯化聚氯乙烯（CPVC）共混超滤膜，探讨了凝固浴中不同溶剂（DMAc）含量对其超滤膜表面酸酐基团偏析程度、微观结构、亲水性、水通量、截留率和抗污染的影响。结果表明：凝固浴中溶剂含量的增加抑制了酸酐基团向膜表面的偏析，导致亲水性减弱；同时，铸膜液中溶剂与水分子之间扩散速率的变小引起延迟分相，使得膜表面孔径变小和分布变窄。当溶剂质量分数为3%时，超滤膜对牛血清白蛋白（BSA）截留率提升至98.10%、通量恢复率为96.82%，且不可逆污染率降为3.77%，表明凝固浴中适量的溶剂可进一步提高超滤膜抗污染性能。

关键词: 非溶剂致相分离, 超滤膜, 表面偏析, 抗污染

Abstract:

The styrene-maleic anhydride copolymer (SMA)/chlorinated polyvinyl chloride (CPVC) blend ultrafiltration membranes was prepared bynon-solvent induced phase separation (NIPS). The effects of different solvent (DMAc) content in coagulation bath on the degree of anhydride group segregation of membranes surface, microstructure, hydrophilicity, water flux, rejection and anti-pollution of the ultrafiltration membrane were discussed. The results showed that the increase of DMAc content in the coagulation bath inhibited the degree of segregation of anhydride on the membrane surface, resulting in the decrease of hydrophilicity. At the same time, the decrease of the diffusion rate between DMAc and water molecules in the casting solution caused delayed phase separation, which made the pore size of the membrane surface smaller and the distribution narrower. When the mass ratio of DMAc was 3%, the BSA retention rate of ultrafiltration membrane increased to 98.10% with the flux recovery rate of 96.82%, and the irreversible contamination rate decreased to 3.77%, indicating that the appropriate solvent in the coagulation bath could further improve the anti-pollution performance of the ultrafiltration membrane.

Key words: non-solvent phase separation, ultrafiltration membrane, surface segregation, anti-pollution

中图分类号:

TQ028.8

陈贵靖, 杨园园, 康冬冬, 邵会菊, 秦舒浩. 凝固浴组成对SMA/CPVC共混超滤膜的结构与性能影响[J]. 化工进展, 2021, 40(3): 1284-1291.

CHEN Guijing, YANG Yuanyuan, KANG Dongdong, SHAO Huiju, QIN Shuhao. Effect of coagulation bath composition on the structure and performance of SMA/CPVC blend ultrafiltration membrane[J]. Chemical Industry and Engineering Progress, 2021, 40(3): 1284-1291.

图/表 9

图1 错流膜池工作原理图

图2 共混超滤膜的红外光谱图

表1 共混超滤膜表面化学组成和平均孔径

序号	化学组成及其质量分数/%			平均孔径 /nm
序号	C	Cl	O	平均孔径 /nm
M0	57.73	38.12	4.15	31.5
M1	59.85	36.14	4.01	29.7
M2	60.46	35.78	3.76	25.6
M3	60.77	35.58	3.65	21.4
M4	61.20	35.46	3.34	19.7
M5	61.32	35.59	3.09	16.3

图3 M0和M1共混超滤膜表面的EDS

图4 共混超滤膜表面和断面电镜图以及孔径分布

图5 共混超滤膜在1.0s时的静态水接触角

图6 共混超滤膜的纯水通量和BSA截留率

图7 共混超滤膜的FRR和Rit

图8 共混超滤膜抗污染模型

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