Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, P.R. China.
Chem Asian J. 2013 Aug;8(8):1873-8. doi: 10.1002/asia.201300135. Epub 2013 May 24.
We report the facile synthesis of aluminum-based metal-organic frameworks (MOFs) with different morphologies and structures by tuning the OH(-) content in the reaction solution. MIL-96 crystals with dodecahedral and hexagonal column shapes were successfully synthesized by tuning the OH(-) ion content of the synthesis solution. When the OH(-) ion content was further increased, MIL-110 with a nanorod morphology appeared as the product. For the first time, we obtained pure MIL-96 and MIL-110 under basic conditions directly by using the 1,3,5-benzenetricarboxylic acid (btc) linker. All samples show significant thermal stability, with a decomposition temperature above 300 °C. We found that the gas adsorption properties of MIL-96 were directly dominated by the crystal morphology. At 0.4 °C and 30 bar, the dodecahedral and hexagonal MIL-96 samples can adsorb 9.3 and 6.5 mmol g(-1) CO2, respectively, although they possess similar surface areas and identical crystalline structures. The MIL-110 nanorod shows a CO2 adsorption capacity of up to 16 mmol g(-1) under the same conditions.
我们通过调节反应溶液中的 OH(-) 含量，轻松合成了具有不同形貌和结构的铝基金属有机骨架（MOFs）。通过调节合成溶液中 OH(-) 离子的含量，成功合成了具有十二面体和六方柱形状的 MIL-96 晶体。当 OH(-) 离子含量进一步增加时，产物为纳米棒形貌的 MIL-110。我们首次在碱性条件下直接使用 1,3,5-苯三甲酸（btc）连接体得到纯的 MIL-96 和 MIL-110。所有样品均表现出显著的热稳定性，分解温度高于 300°C。我们发现 MIL-96 的气体吸附性能直接受晶体形貌的控制。在 0.4°C 和 30 巴下，十二面体和六方 MIL-96 样品分别可吸附 9.3 和 6.5 mmol g(-1) 的 CO2，尽管它们具有相似的比表面积和相同的晶体结构。在相同条件下，MIL-110 纳米棒的 CO2 吸附量高达 16 mmol g(-1)。
