Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 5, Pages 1022-1033Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00059
Keywords
surface grafting; zwitterionic membrane; high permeability; efficient separation of NaCl/raffinose; antifouling property
Funding
- National Natural Science Foundation of China [21676233, 21788004]
- National Basic Research Program of China [2015CB655303]
- Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions [CITTCD20170305]
- Scientific Research Program of Beijing Education Commission [KZ201910005001]
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In this work, a polyamide membrane was first prepared via in situ introduction of a surface-initiated atom transfer radical polymerization (SI-ATRP) initiator in interfacial polymerization. Then, a zwitterionic membrane was obtained by SI-ATRP grafting of sulfobetaine methacrylate on a polyamide membrane. The prepared membranes were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy, indicating the successful grafting of zwitterions on polyamide membranes. Pure water permeability of the optimized zwitterionic membrane was up to 16.8 L m(-2) h(-1) bar(-1), 2.9 times as high as that of the polyamide membrane with similar Na2SO4 rejection. The NaCl rejection of the membrane after grafting for 1 h was only 17.2%, much lower than that with a polyamide membrane, which was sought for separation of monovalent salts/neutral organics. The membrane also showed excellent antifouling properties when three categories of usual pollutants were chosen as feed solution. The one-step SI-ATRP method for preparing zwitterionic membranes with high permeability was facile and convenient, which has promising applications in desalination and food separation processes.
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