Journal
DESALINATION AND WATER TREATMENT
Volume 43, Issue 1-3, Pages 221-229Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2012.672175
Keywords
HBP-g-silica; aPES; Chlorine resistance; Reverse osmosis membrane
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Funding
- Plant Technology Advancement Program [11 seaHERO B02-06]
- Ministry of Land, Transport and Maritime Affairs of the Korean government
- Human Resources Development
- Korea Institute of Energy Technology Evaluation and Planning [20114010203050]
- Korea government Ministry of Knowledge Economy
- Korea Evaluation Institute of Industrial Technology (KEIT) [20114010203050] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, hyperbranched aromatic polyamide-grafted silica (HBP-g-silica) and disulfonated 4,4-bis(3-aminophenoxy)phenyl sulfone (aPES) composite membrane was prepared to enhance the chlorination resistance of reverse osmosis (RO) membrane for desalination process. As the commercial polyamide (PA) RO membrane is very weak against free chlorine in desalination process, inorganic nanoparticle and new membrane material were introduced to RO membrane's active layer. The HBP-g-silica which includes lots of PA chains on the surface of silica and the new material aPES for RO membrane were characterized by H-1-NMR and Fourier transform infrared spectroscopy (FT-IR). The surface morphology of synthesized RO membrane was characterized by scanning electron microscope, and the performance, salt rejection, and water flux were evaluated before and after chlorination test. After the chlorination test, salt rejection was decreased by 36.2% and water permeation was increased only by 5.6% compared to the performance before chlorination measurement. The HBP-g-silica loading significantly modified the three-dimensional polyamide network structures and contributed to high performance by the chain stiffness of the copolymer with high degree of cross-linking. Therefore, the HBP-g-silica that protects PA structure from degradation enhances chlorine resistance in RO membrane.
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