膜科学与技术

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Preparation of fluorinated polyethersulfone hydrophobic membrane and its application in membrane distillation

Authors： Liu lixia1,2, Shen Fei2, Luo Jianquan2, Wan Yinhua2

Units： 1.College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, China 2.State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

KeyWords： Membrane distillation, polyethersulfone, radiation grafting, RO brine, desalination

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(4):93-101

Abstract：

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.

Funds：

“太阳能光热驱动海水淡化技术”项目KGCX2-YW-380，“聚醚砜膜的疏水改性及其膜蒸馏脱盐性能研究”项目CXCY2018131

AuthorIntro：

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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