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Preparation and humic acid fouling resistance of poly(vinylidene fluoride)–fabric composite membranes for membrane distillation
Author(s) -
Huo Ruiting,
Gu Zhenya,
Zuo Kaijie,
Zhao Guangming
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32271
Subject(s) - membrane distillation , membrane , materials science , composite number , fouling , phase inversion , coating , composite material , chemical engineering , humic acid , polyvinylidene fluoride , membrane fouling , fluoride , polymer , desalination , chemistry , organic chemistry , fertilizer , biochemistry , engineering , inorganic chemistry
A novel, flat‐sheet poly(vinylidene fluoride) (PVDF)–fabric composite membrane used for membrane distillation (MD) was prepared by coating and a wet‐phase inversion process. This is a simple and suitable method for preparing large, flat‐sheet MD membranes with high strengths and better fouling resistance. The PVDF–fabric composite membrane was a double‐layer membrane, containing a PVDF porous membrane layer on the fabric support. The polyester filament woven fabric, which was used as support of the composite membrane, was finished with the water‐and‐oil repellent agent FK‐510 or chitosan before the coating process. The effects of fabric finishing on the preparation and characteristics of the composite membrane were studied. The fouling resistance of the prepared composite membrane was investigated by air‐gap membrane distillation, with a saturated humic acid solution containing NaCl as the feed. The experimental results indicate that the fabric, finished with 2 g/L FK‐510 or 5 g/L chitosan, was suitable for preparing the composite membrane. With the protection of the fabric support, the prepared composite membrane exhibited better humic acid fouling resistance as its fabric support surface was in contact with the feed solution in the MD process, especially when the fabric support was finished with chitosan. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010