کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7611531 | 1493515 | 2015 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Insights into chromatographic separation using core-shell metal-organic frameworks: Size exclusion and polarity effects
ترجمه فارسی عنوان
بینش های جداسازی کروماتوگرافی با استفاده از چارچوب فلزات ارگانیک هسته ای: محرومیت از اندازه و اثرات قطبی
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کلمات کلیدی
چارچوب فلزی-ارگانیک، کروماتوگرافی مایع جداسازی، شبیه سازی، جذب،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Porous metal-organic frameworks (MOFs) [Cu3(BTC)2(H2O)3]n (also known as HKUST-1; BTC, benzene-1,3,5-tricarboxylic acid) were synthesized as homogeneous shell onto carboxyl functionalized magnetic microparticles through a liquid phase epitaxy (LPE) process. The as-synthesized core-shell HKUST-1 magnetic microparticles composites were characterized by XRD and SEM, and used as stationary phase in high performance liquid chromatography (HPLC). The effects of the unique properties of MOFs onto the chromatographic performance are demonstrated by the experiments. First, remarkable separation of pyridine and bipyridine is achieved, although both molecules show a strong interaction between the Cu-ions in HKUST-1 and the nitrogen atoms in their heterocyles. The difference can be explained due to size exclusion of bipyridine from the well defined pore structure of crystalline HKUST-1. Second, the enormous variety of possible interactions of sample molecules with the metal ions and linkers within MOFs allows for specifically tailored solid phases for challenging separation tasks. For example, baseline separation of three chloroaniline (CLA) isomers tested can be achieved without the need for gradient elution modes. Along with the experimental HPLC runs, in-depth modelling with a recently developed chromatography modelling software (ChromX) was applied and proofs the software to be a powerful tool for exploring the separation potential of thin MOF films. The pore diffusivity of pyridine and CLA isomers within HKUST-1 are found to be around 2.3 Ã 10â15 m2 sâ1. While the affinity of HKUST-1 to the tested molecules strongly differs, the maximum capacities are in the same range, with 0.37 mol Lâ1 for pyridine and 0.23 mol Lâ1 for CLA isomers, corresponding to 4.0 and 2.5 molecules per MOF unit cell, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1411, 11 September 2015, Pages 77-83
Journal: Journal of Chromatography A - Volume 1411, 11 September 2015, Pages 77-83
نویسندگان
Weiwei Qin, Martin E. Silvestre, Frank Kirschhöfer, Gerald Brenner-Weiss, Matthias Franzreb,