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膜蒸馏用抗污染PVDF复合膜的制备与研究

作者：晋墩尚，谢松辰，李志霞，宋旭峰，彭跃莲

单位：北京工业大学环境与生命学部，北京 100124

关键词： PVDF中空纤维膜；浸渍涂覆-固化；抗污染；抗结垢；膜蒸馏

DOI号：

分类号： TQ 028

出版年,卷(期):页码： 2022,42(5):129-138

摘要：

提高膜表面的疏水化及液体进入压力(Liquid entry pressure，LEP)是减缓膜蒸馏过程中膜污染问题的有效策略。本研究以聚偏氟乙烯（Polyvinylidene fluoride，PVDF）中空纤维膜为基膜，采用浸渍涂覆-固化法将乳液组装到PVDF膜表面，制备了具有抗污染性能的复合膜。探究了涂覆时间对膜的形貌及性能的影响，并考察了复合膜的抗污染和抗结垢性能。结果表明，当涂覆时间为20min时，复合膜的水接触角达到115°，LEP值达到0.75MPa。在DCMD浓缩实验中，复合膜在分别处理3.5%wt NaCl、50mg/L的HA和14.7mM CaSO4水溶液时，膜通量稳定，冷凝液电导率保持在10μS/cm以内，表现出优异的抗污染和抗结垢性能。此外，考察了中空纤维复合膜的稳定性。结果表明，复合膜在浓缩3.5%wt NaCl水溶液时，膜通量为16kg/m2h，冷凝液电导率保持在15μS/cm以内，表现出良好的长期稳定性能。

Hydrophobization of membrane surface and high LEP are effective strategies to mitigate membrane fouling during membrane distillation. The composite membranes with anti-fouling properties were prepared by anchoring the emulsion on the PVDF hollow fiber porous membrane surface using the dip-coating-curing method. The effects of coating time on the morphology and properties of the membranes were investigated, and the anti-scaling and anti-fouling properties of the composite membranes were studied. The results showed that when the coating time was 20 min, the contact angle of the composite membrane reached 115° and the LEP reached 0.75 MPa. In the DCMD concentration experiment, the composite membrane maintained the flux when treating 3.5% wt NaCl, 50 mg/L HA and 14.7 mM CaSO4 aqueous solution, respectively, showing excellent anti-fouling and anti-scaling performance. In addition, the stability of hollow fiber composite membrane was investigated. The results show that when the hollow fiber composite membrane concentrates 3.5%wt NaCl aqueous solution, the osmotic flux is 16kg/m2h, and the condensate conductivity is less than 15μS/cm, showing good long-term stability.

基金项目：

项目来源“VMD-过热蒸汽干燥热敏性物料中的膜及过程研究”（21878005）。

作者简介：

晋墩尚（1995-06），男，籍贯：山东省菏泽市，硕士研究生，研究方向：膜蒸馏中膜的制备与应用研究，E-mail：17863659593@163.com。

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