کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7019761 | 1455936 | 2018 | 58 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of MOFs in Thin-Film Nanocomposite (TFN) membranes
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کلمات کلیدی
TFCHMIM2-methylimidazoleHAADFEDXTFn - TFNEnergy Dispersive X-ray Spectroscopy - اشعه ماوراء بنفش اشعه ایکسCharacterization - تعیین مشخصاتHigh-angle annular dark field - زمینه تاریک حلقه زاویه دارStem - ساقهPositron Annihilation Lifetime Spectroscopy - طیف سنجی طول عمر انقراض PositronSEM - مدل معادلات ساختاری / میکروسکوپ الکترونی روبشیScanning electron microscopy - میکروسکوپ الکترونی روبشیNanofiltration - نانوفیلتراسیون Thin-film nanocomposite - نانوکامپوزیت نازک فیلمPALS - پالسX-ray diffraction - پراش اشعه ایکسXRD - پراش اشعه ایکسInterfacial polymerization - پلیمریزاسیون اینترفیسMetal-organic frameworks (MOFs) - چارچوب های آلی فلزات (MOFs)Thin-film composite - کامپوزیت نازک فیلم
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The role of MOFs in Thin-Film Nanocomposite (TFN) membranes The role of MOFs in Thin-Film Nanocomposite (TFN) membranes](/preview/png/7019761.png)
چکیده انگلیسی
Incorporation of MOFs in interfacially polymerized Thin-Film Nanocomposite (TFN) membranes has widely been shown to result in increased membrane performance. However, the exact functioning of these membranes is poorly understood as large variability in permeance increase, filler incorporation and rejection changes can be observed in literature. The synthesis and functioning of TFN membranes (herein exemplified by ZIF-8 filled polyamide (PA) membranes prepared via the EFP method) was investigated via targeted membrane synthesis and thorough characterization via STEM-EDX, XRD and PALS. It is hypothesized that the acid generated during the interfacial polymerization (IP) at least partially degrades the crystalline, acid-sensitive ZIF-8 and that this influences the membrane formation (through so-called secondary effects, i.e. not strictly linked to the pore morphology of the MOF). Nanoscale HAADF-STEM imaging and STEM-EDX Zn-mapping revealed no ZIF-8 particles but rather the presence of randomly shaped regions with elevated Zn-content. Also XRD failed to show the presence of crystalline areas in the composite PA films. As the addition of the acid-quenching TEA led to an increase in the diffraction signal observed in XRD, the role of the acid was confirmed. The separate addition of dissolved Zn2+ to the synthesis of regular TFC membranes showed an increase in permeance while losing some salt retention, similar to observations regularly made for TFN membranes. While the addition of a porous material to a TFC membrane is a straightforward concept, all obtained results indicate that the synthesis and performance of such composite membranes is often more complex than commonly accepted.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 563, 1 October 2018, Pages 938-948
Journal: Journal of Membrane Science - Volume 563, 1 October 2018, Pages 938-948
نویسندگان
Cédric Van Goethem, Rhea Verbeke, Martin Pfanmöller, Tönjes Koschine, Marcel Dickmann, Tanja Timpel-Lindner, Werner Egger, Sara Bals, Ivo F.J. Vankelecom,