膜科学与技术

g-C3N4改性PVDF-CTFE混合基质超滤膜的制备与性能

作者：王新艳，张伟政，李海峰，宋飞飞，王志文，冯献社

单位： 1.山东招金膜天股份有限公司，烟台264000;2. 招远市住房和城乡建设局烟台264000;3.山东招金集团有限公司烟台264000

关键词：聚偏氟乙烯-三氟氯乙烯；石墨氮化碳；混合基质膜；光催化剂；染料降解

出版年,卷(期):页码： 2023,43(1):99-108

摘要：

以聚偏氟乙烯-三氟氯乙烯（PVDF-CTFE）为成膜聚合物，二甲基甲酰胺（DMF）为溶剂，聚乙烯吡咯烷酮（PVP）为致孔剂，自制的光催化剂石墨氮化碳（g-C3N4）为催化改性颗粒，采用非溶剂相转换（NIPS）法成功制备了PVDF-CTFE/g-C3N4混合基质膜。考察了不同改性粒子添加量对混合基质膜结构及性能的影响。结果表明，g-C3N4的添加使得PVDF-CTFE膜的亲水性能、通透性能、力学性能和超滤分离性能都有所增强，并展现出良好的抗污染能力。当g-C3N4添加量达到2%(质量分数)时，其通量恢复率超过80%,并保持纯水通量为309.3 L/(m2·h)，超滤分离精度为98.1%，拉伸断裂强度为3.8 MPa。此外，由于g-C3N4的添加，PVDF-CTFE/g-C3N4混合基质膜还能够通过光照催化降解亚甲基蓝（MB）染料，MB残留率最低达到22%。

Abstract: In this paper, PVDF-CTFE/g-C3N4 mixed matrix membranes were successfully prepared by non-solvent induced phase separation (NIPS) method using PVDF-CTFE as membrane-forming polymer, DMF as solvent, PVP as porogen, and self-made photocatalyst g-C3N4 as catalytically modified particles. The effects of different amount of modified particles on the structure and properties of mixed matrix membranes were studied. The results showed that the addition of g-C3N4 increased the hydrophilic properties, permeability, mechanical properties and ultrafiltration separation performance of PVDF-CTFE membranes, and showed good anti-fouling ability. When the addition amount of g-C3N4 reached to 2wt.%, the flux recovery rate exceeded 80%, the pure water flux kept at 309.3 L/（m2·h）, the ultrafiltration separation accuracy was 98.1%, and the tensile breaking strength was 3.8 MPa. In addition, due to the addition of g-C3N4, the PVDF-CTFE/g-C3N4 mixed matrix membrane could also catalyze the degradation of methylene blue dye (MB) by light, and the MB residual rate was as low as 22%.

王新艳（1977－），女，籍贯?硕士研究生，研究方向为新型膜材料制备技术

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