膜科学与技术

氟化聚醚砜疏水膜的制备及其膜蒸馏应用

作者：刘丽霞¹，²，沈飞²，罗建泉²，万印华²

单位： 1.化学化工学院，聊城大学，山东聊城，252300； 2.生化工程国家重点实验室，中国科学院过程工程研究所，中国科学院大学，北京 100190

关键词：膜蒸馏聚醚砜辐照接枝反渗透浓水脱盐

出版年,卷(期):页码： 2021,41(4):93-101

摘要：

以全氟辛基乙基甲基丙烯酸酯（FMA-C8）为接枝单体，采用溶液均相共辐照方式（60Co γ 射线）对聚醚砜（PES）材料进行疏水改性，制备得到氟化的PES（PES-g-PFMA-C8），进而将其喷涂在自制多孔PES膜表面制备得到疏水化的PES膜。借助红外光谱、光电子能谱、接触角仪等对PES-g-PFMA-C8及其改性膜进行表征，探究喷涂疏水改性对PES膜性能的影响。结果表明，疏水改性的PES膜（H-PES膜）的疏水性较PES膜显著提高，接触角由73.1 °增大到109.3 °，液体进入压力由295 kPa提高到410 kPa，70 °C下对3.5 wt% NaCl盐溶液进行真空膜蒸馏时，80 h长时间运行过程中通量保持在50 kg m-2 h-1左右，脱盐率高达99.98%；且该膜应用于海水淡化反渗透浓水处理过程中，产水水质稳定，能将海水淡化的总体水回收率由45%提高到83.7%，在膜蒸馏脱盐方面具有较好的应用潜力。

1H, 1H, 2H, 2H-perfluorodecyl methacrylate (FMA-C8) was used as monomer, and grafted onto polyethersulfone (PES) by simultaneous irradiation in a homogeneous system under 60Co γ ray. The grafted product PES-g-PFMA-C8 with high hydrophobicity was obtained. PES-g-PFMA-C8 was then sprayed onto home-made porous PES membranes to fabricate hydrophobic PES membranes (H-PES). The effects of spraying on PES membranes were investigated via Fourier transformed infrared spectroscopy, X-ray photo electronic spectroscopy and optical contact angle goniometer, etc. The results showed that the hydrophobicity of H-PES membrane increased obvisouly after spraying modification: contact angle increased from 73.1 ° to 109.3 °, and liquid entry pressure increased from 295 kPa to 410 kPa. During an intermittent 80 h VMD desalination operation, a flux of approximately 50 kg m-2 h-1 and a stable salt rejection of 99.98% were achieved when a 3.5 wt% NaCl solution was treated at 70 °C by the H-PES membrane. Furthermore, the H-PES membrane was applied to concentrate RO brines, and the permeate quality was high, and the water recovery increased from 45% to 83.7%, showing great potential in the real application of membrane distillation desalination.

刘丽霞（1988-），女，山东聊城人，讲师，博士，从事膜材料改性和膜制备研究

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