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- Title
Preparation and properties of PVDF/PSA acid-resistant composite nanofiltration membrane modified by UV grafting and interfacial polymerization.
- Authors
FU Wei-gui; ZHAI Gao-wei; LIU Jian-chao; LIU Yao-wei; FU Zhi-yuan; DU Run-hong; CHEN Xi; CHEN Li
- Abstract
To solve the problem of poor acid resistance of traditional separation membranes, a polyvinylidene fluoride (PVDF) composite nanofiltration (NF) membrane with acid resistant property was prepared by combining ultraviolet (UV) grafting and interfacial polymerization (IP) methods. Firstly, acrylate (AA) was introduced onto the self-made PVDF membrane surface by UV-initiated free radical polymerization, and then amide reaction with polyethyleneimine (PEI) as aqueous phase monomer followed by IP reaction with 1,3-benzenedisulfonyl chloride (BDC) to obtain composite NF membrane with good acid-resistant property. The chemical structure and morphology of the membrane surfaces were investigated by IR, XPS, SEM and AFM. The effects of grafting time, monomer concentration and reaction time on the performance of the composite membrane were analyzed. Moreover, the separation test was carried out in acidic environment to investigate the acid resistance of the composite NF membrane. The results showed that the optimum preparation conditions of PVDF/PSA composite NF membrane were UV irradiation grafting time of 15 min, the mass fractions of PEI and BDC of 2.0% and 0.2% respectively, and reaction time of 30 s; then the pure water permeability of composite NF membrane prepared was 20 L/(m²⋅h⋅bar) (1 bar = 0.1 MPa), and the rejection rate for typical inorganic divalent salts of MgSO4 and Na2SO4 was 83.4% and 85.6%, respectively, and the rejection rate for the dye Reactive Red 2 was close to 100%. The water contact angle of the composite NF membrane surface was basically stable after soaking in HCl aqueous solution for 35 d, the rejection rate of the composite NF membrane for the divalent salts of MgSO4 and Na2SO4 can be maintained above 70%, the rejection rate for Reactive Red 2 was maintained at 100%, and the dye separation performance was almost unaffected by acid treatment.
- Subjects
POLYMERIZATION; NANOFILTRATION; MEMBRANE separation; POLYVINYLIDENE fluoride; PROBLEM solving; CONTACT angle
- Publication
Journal of Tiangong University, 2021, Vol 40, Issue 5, p1
- ISSN
1671-024X
- Publication type
Article
- DOI
10.3969/j.issn.1671-024x.2021.05.001