کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
637609 | 1456151 | 2009 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemical modification of P84 copolyimide membranes by polyethylenimine for nanofiltration
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
This study involved preparation of positively charged nanofiltration membranes by chemical modification of P84 copolyimide asymmetric membranes using branched polyethylenimine (PEI). Optimized membrane performance was shown to be 50.9 ± 5.1% salt rejection to a 2.0 g/L NaCl solution with a flux of 1.2 ± 0.1 m3 mâ2 dayâ1 at 13.8 bar and room temperature. The rejection sequence of CaCl2 > NaCl > Na2SO4 indicates a positive charge at the membrane surface, which may be attributed to amine groups remaining after the reaction between PEI and polyimide. Upon modification, the pores of the membranes were filled with PEI molecules so as to cause the membranes to exhibit nanofiltration properties. The PEI-modified polyimide membranes likely have a highly cross-linked structure which makes these membranes stable in various operating environments including high temperature (100 °C), organic solvents, and mild acid and base (2 â¤Â pH â¤Â 10). These membranes showed efficient removal of multivalent heavy metal ions (>95%) and may potentially be used for treatment of industrial wastewater.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 327, Issues 1â2, 5 February 2009, Pages 49-58
Journal: Journal of Membrane Science - Volume 327, Issues 1â2, 5 February 2009, Pages 49-58
نویسندگان
Chaoyi Ba, James Langer, James Economy,