کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
627052 1455454 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Theoretical calculation of reflection coefficients of single salt solutions through charged porous membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Theoretical calculation of reflection coefficients of single salt solutions through charged porous membranes
چکیده انگلیسی

Normal rejections of salt solutions through charged membranes have been studied a lot in theories and experiments, but few works touched upon negative anomalous rejection. In this paper, the negative rejection behaviors were investigated based on the reflection coefficients (σ). The space-charge (SC) model and the Teorell–Meyer–Sievers (TMS) model were adopted to calculate σ for single salt solutions with different ionic valences and diffusion coefficients. The results indicated that equivalent concentration is beneficial to describe σ. σ would be negative in a certain intermediate concentration region if the diffusion coefficient ratio of co-ion and counter-ion is more than 1.0. The negative osmosis phenomena can be explained utilizing the ionic transport numbers. Concerning the comparison of the two models, TMS model would overestimate the σ when the radius is larger than 5.0 nm, and the dimensionless charge density in the pore wall is more than 1.0. Otherwise, the TMS model is comparable to the SC model when σ is positive, or else, it would underrate σ. These findings are helpful to explain the nature of negative osmosis phenomena.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 236, Issues 1–3, 31 January 2009, Pages 306-315