کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
637266 883681 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An experimental investigation of evaporation time and the relative humidity on a novel positively charged ultrafiltration membrane via dry–wet phase inversion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
An experimental investigation of evaporation time and the relative humidity on a novel positively charged ultrafiltration membrane via dry–wet phase inversion
چکیده انگلیسی

In this paper, a novel positively charged asymmetrical membrane was manufactured from brominated polyphenylene oxide (BPPO)/N-methyl-2-pyrrolidone (NMP)/H2O via in situ amination with triethanolamine (TEOA) and a dry–wet phase inversion. The casting solution was exposed to the humid surroundings before immersing into the coagulation bath. The positive charge character of the membrane surface was examined by streaming potential and the effect of the evaporation time and the relative humidity (RH) on the membrane properties and microstructure were investigated, respectively. It was interestingly found that the role of evaporation time and the relative humidity on the membrane performance and morphologies for a positively charged casting system was different from the conventional rule. This was mainly due to the competition of two influence factors, i.e., evaporation of solvent and water absorption of the casting solution. The results were conformed to SEM observation and pore size distribution. Furthermore, the process of water absorption of the casting solution was monitored by attenuated total reflectance infrared (ATR-FTIR) spectroscopy technique. Additionally, in order to compare to the dry–wet phase inversion method, the membranes were obtained by prolonging the exposure time to more than 12 h (which was similar to vapor-induced phase inversion) at different RH. Polymer nodules on the membrane surface and a symmetrical morphology were observed by SEM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 326, Issue 1, 5 January 2009, Pages 168–177
نویسندگان
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