Xiong Mingxuan, Lu Youli, Zhong Mingzhu, Chen Liyu, Liu Gangyi, Ju Wenbo
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, China.
Central Laboratory, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, Shanghai 200031, China.
Langmuir. 2024 Jul 16. doi: 10.1021/acs.langmuir.4c01634.
Superlong MOF-74-type micro/nanofibers, which have aspect ratios much higher than 200, are synthesized via nanoparticulate MOF-mediated recrystallization. Co-MOF-74 microfibers have high crystallinity, whereas Co-MOF-74-II nanofibers are composed of nanocrystals and amorphous phases, even though they have nanofibrous morphology. Both MOFs consist of plenty of micropores with diameters in the range of 1.0 to 2.0 nm, and they exhibit high thermal stability with a decomposition temperature higher than 260.0 °C. The MOFs are demonstrated for selective absorption of some vitamins including riboflavin, folic acid, and 5-methyltetrahydrofolate. Co-MOF-74-II nanofibers can efficiently absorb riboflavin and folic acid from their aqueous solution with absorption percentages approaching 90.0%, and they have enhanced capability for absorbing tocopherol in methanol. The micro/nanofibrous morphology, together with the capability for selective vitamin absorption, makes the novel MOFs highly promising for applications in micro-solid-phase extraction.
通过纳米颗粒金属有机框架（MOF）介导的重结晶合成了长径比远高于200的超长MOF-74型微/纳米纤维。Co-MOF-74微纤维具有高结晶度，而Co-MOF-74-II纳米纤维由纳米晶体和非晶相组成，尽管它们具有纳米纤维形态。两种MOF都由大量直径在1.0至2.0nm范围内的微孔组成，并且它们表现出高热稳定性，分解温度高于260.0°C。这些MOF被证明对包括核黄素、叶酸和5-甲基四氢叶酸在内的一些维生素具有选择性吸收能力。Co-MOF-74-II纳米纤维能够从其水溶液中有效吸收核黄素和叶酸，吸收百分比接近90.0%，并且它们在甲醇中吸收生育酚的能力有所增强。微/纳米纤维形态以及选择性维生素吸收能力使得这种新型MOF在微固相萃取应用中极具前景。
