کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7019714 1455936 2018 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Specific co-ion sorption and diffusion properties influence membrane permselectivity
ترجمه فارسی عنوان
خواص جذب و انتشار خاص یونها نفوذپذیری غشا را تحت تاثیر قرار می دهد
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی
The apparent permselectivity of three cation exchange membranes (CEMs) was measured using four monovalent strong electrolytes (sodium chloride, sodium bromide, sodium nitrate and sodium perchlorate). The salt (co-ion) sorption and diffusion coefficients of a crosslinked sulfonated polymer, based on the sodium salt form of 2-acrylamido-2-methylpropane sulfonic acid (AMPS), were measured to describe the influence of sorption and diffusion properties on apparent permselectivity. Three models were used (in conjunction with electroneutrality and thermodynamic equilibrium conditions) to probe the influence of electrostatic and dispersion energy forces on specific co-ion sorption. Dispersion forces appear to be important for capturing specific co-ion sorption properties. A model combining the Mackie and Meares hindered diffusion theory and Manning's counter-ion condensation theory was used to explore the influence of electrostatics and polymer tortuosity on co-ion diffusion. Ion-polymer complexation interactions between sodium perchlorate and the poly(ethylene oxide)-based crosslinker used in the sulfonated polymer significantly influenced sorption and diffusion properties. The occurrence of these ion-polymer complexes was supported by salt sorption measurements made on three uncharged, crosslinked poly(ethylene oxide)-containing polymers with 3, 10, or 13 ethylene oxide repeat units between crosslinks. Ion specific sorption, diffusion, and ion-polymer complexation phenomena influence apparent permselectivity properties of charged polymers, and the sorption and complexation phenomena appear to affect apparent permselectivity properties to a greater extent compared to ion specific diffusion effects other than size-based differences.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 563, 1 October 2018, Pages 492-504
نویسندگان
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