کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7007688 | 1455252 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Salt rejection behavior of carbon nanotube-polyamide nanocomposite reverse osmosis membranes in several salt solutions
ترجمه فارسی عنوان
رفتار لغزش نمک نانوکامپوزیت کربن نانولوله-پلی آمید غشاء اسمز معکوس در چند محلول نمک
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
چکیده انگلیسی
The present paper describes the desalination performance of reverse osmosis (RO) membranes of multi-walled carbon nanotube-polyamide complex (CNT-PA) and commercial polyamide membranes in NaCl, MgCl2, MgSO4 and Na2SO4 aqueous solutions. The permeate flux, salt rejection, and salt flux were determined in a cross-flow experiment. The CNT-PA and commercial RO (PA) membranes (SWC5, Nitto Denko Co.) showed 96.0% and 99.7% salt rejection, respectively, for 0.2% NaCl aqueous solution at 0.7â¯MPa. The calculated salt flux was 0.38â¯g·mâ2·hâ1 (CNT-PA) and 0.07â¯g·mâ2·hâ1 (SWC5). The salt rejection increased with increasing running pressure and decreasing salt concentration. The zeta potential measurement of CNT-PA demonstrated that it is negatively charged due to the presence of CNT. Accordingly, it showed salt rejection performances against the four salt solutions (Na2SO4â¯>â¯MgSO4â¯>â¯NaClâ¯>â¯MgCl2) that differed from that of the usual PA membranes (Na2SO4â¯>â¯MgSO4â¯>â¯MgCl2â¯>â¯NaCl). These data are explained based on the Donnan model (CNT-PA) and steric hindrance pore model (SWC5), except for the case of chlorides under low-flux or high ionic strength conditions, where the diffusion and molecular size exclusion of the salts dominate over their mas-transport. Positron annihilation lifetime spectroscopy (PALS) enabled the estimation of the pore diameters of these membranes: 0.55â¯nm (CNT-PA) and 0.58â¯nm (SWC5).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 443, 1 October 2018, Pages 165-171
Journal: Desalination - Volume 443, 1 October 2018, Pages 165-171
نویسندگان
Kenji Takeuchi, Yoshihiro Takizawa, Hidenori Kitazawa, Moeka Fujii, Kaoru Hosaka, Josue Ortiz-Medina, Aaron Morelos-Gomez, Rodolfo Cruz-Silva, Masatsugu Fujishige, Noboru Akuzawa, Morinobu Endo,