Metal-organic framework one-dimensional fibers as efficient catalysts for activating peroxymonosulfate
Metal-organic framework one-dimensional fibers as efficient catalysts for activating peroxymonosulfate
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金属有机骨架一维纤维作为过一硫酸盐活化的有效催化剂
DOI：
10.1016/j.cej.2017.07.156
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发表时间：
2017-12-15
影响因子：
15.1
通讯作者：
Wang, Lianjun
中科院分区：
文献类型：
--
作者：
Wang, Chaohai;Wang, Hongyu;Wang, Lianjun
金属有机骨架(MOF)纳米晶材料因其在多相催化中的应用而备受关注。然而，在实际应用中，它们与反应混合物的分离性很差。在这项研究中，我们报道了首次在电纺聚丙烯腈(PAN)纳米纤维上固定含有沸石咪唑骨架(ZIF-67)-67纳米颗粒的钴金属-有机骨架，并将其用作活化过一硫酸盐(PMS)的复合催化剂(ZIF-67/PAN)。详细的表征表明，ZIF-67/PAN纳米纤维具有柔性的一维结构。为了考察ZIF-67/PAN纳米纤维的催化性能，选择PMS活化催化降解酸性黄-17(AY)作为模型催化反应。结果表明，ZIF-67/PAN催化剂在10min内脱除了95.1%的AY(500 mg L-1)，远远高于许多其他PMS催化剂。更有趣的是，柔性的ZIF-67/PAN复合纳米纤维催化剂不仅容易从溶液中分离出来，而且还保持了较高的催化稳定性。考察了催化剂用量、反应温度、溶液pH、竞争有机分子掺杂等因素对PMS活化的影响。通过电子顺磁共振实验对降解机理进行了初步探讨。这项工作为制备具有优异循环性能的高性能MOF催化剂提供了新的视角，可能会促进MOF材料在更实际的应用中的应用。
Metal-organic framework (MOF) nanocrystalline materials have received great attention because of their application in heterogeneous catalysis. However, they suffer from poor separation from reaction mixtures in practical applications. In this study, we report the first cobalt metal-organic framework containing zeolitic imidazolate framework (ZIF)-67 nanoparticles immobilized on electrospun polyacrylonitrile (PAN) nanofibers, which was used as a composite catalyst (ZIF-67/PAN) for activating peroxymonosulfate (PMS). Detailed characterization showed that the ZIF-67/PAN nanofibers possessed a flexible one-dimensional structure. To demonstrate the catalytic performance of the ZIF-67/PAN nanofibers, the activation of PMS for the catalytic degradation of acid yellow-17 (AY) was chosen as the model catalytic reaction. The results show that 95.1% of AY (500 mg L-1) was removed by ZIF-67/PAN in 10 min, which is much higher than many other PMS catalyst. More interestingly, the flexible ZIF-67/PAN composite nanofibers catalysts were not only easy to separate from solution but they also retained high catalytic stability. The influencing factors for PMS activation were also investigated, including the catalyst dosage, reaction temperature, solution pH, and doping with competing organic molecules. The degradation mechanism was elucidated by electron paramagnetic resonance experiments. This work provides a new sight into the fabrication of high-performance MOF catalysts with outstanding recycling properties, which may promote the use of MOF materials in more practical applications.