کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9681029 1455509 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel kind of amphoteric composite nanofiltration membrane prepared from sulfated chitosan (SCS)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
A novel kind of amphoteric composite nanofiltration membrane prepared from sulfated chitosan (SCS)
چکیده انگلیسی
Sulfated chitosan (SCS), a typical amphoteric polyelectrolyte, was prepared by a homogeneous method. A novel kind of amphoteric composite nanofiltration (NF) membrane was prepared by coating the aqueous solution of sulfated chitosan onto a PAN UF membrane, subsequently crosslinked with glutaraldehyde. The effects of the membrane preparation techniques and operating conditions on the rejection performance of the composite membranes were studied. The results suggest that composite NF membranes with excellent rejection performance could be prepared while SCS concentration was 2.0 wt%, curing time was 1 h at 50°C, glutaraldehyde concentration was 0.5 wt%, and crosslinking time was 1.5 h at 60°C. The rejections of the resulting membrane of K2SO4, Na2SO4, and NaCl solutions (1000 mg/L) were 92.8, 92.1, and 50.3% at 25°C and 0.40 MPa; the permeate fluxes were 11.3, 7.1, and 10.4 kg/m2·h, respectively. The rejection of this kind of membrane to the electrolyte solutions decreased in the order of K2SO4, Na2SO4, KCl, NaCl, MgSO4 and MgCl2. This suggests that the membrane's active layer acquires a negative surface charge distribution by the adsorption of anions from the electrolyte solution, and this charge distribution mainly determines the performance of the membrane.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 181, Issues 1–3, 5 September 2005, Pages 173-183
نویسندگان
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