Facile synthesis of nano-sized metal-organic frameworks, chromium-benzenedicarboxylate, MIL-101
Facile synthesis of nano-sized metal-organic frameworks, chromium-benzenedicarboxylate, MIL-101
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DOI：
10.1016/j.cej.2010.11.098
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发表时间：
2011-02-01
影响因子：
15.1
通讯作者：
Jhung, Sung Hwa
中科院分区：
文献类型：
--
作者：
Khan, Nazmul Abedin;Kang, In Joong;Jhung, Sung Hwa
一种具有巨大孔隙率的铬-苯二甲酸（Cr-BDC），名为MIL-101，是研究最广泛的金属有机骨架（MOF）材料之一，已在各种反应条件（例如各种水浓度）下合成。 pH 值和合成方法（电加热和微波辐射）以获得纳米尺寸的晶体。晶体尺寸随着水浓度和 pH 值的增加而减小。稀释反应物中尺寸的减小可以用比成核速率更小的晶体生长速率来解释。 MIL-101 在稀释条件下尺寸的减小与沸石的合成不同，可能是因为 MOF 是通过简单的络合过程获得的。此外，高pH可能不仅有利于产生苯二甲酸，而且有利于产生MIL-101结构成核所需的铬三聚体。在选定的条件下，可以以相对较高的产率方便、重复地获得尺寸约为50 nm的MIL-101，这可能会扩大有价值的MOF材料的应用。 (C) 2010 Elsevier B.V. 保留所有权利。
A chromium-benzenedicarboxylate (Cr-BDC) named MIL-101 with huge porosity, one of the most widely studied metal-organic framework (MOF) materials, has been synthesized in wide range of reaction conditions like various water concentrations. pHs and synthesis methods (electric heating and microwave irradiation) to get nano-sized crystals. The crystal size decreases with increasing water concentration and pH. The decrease of size in diluted reactants may be explained with a smaller rate of crystal growth than nucleation rate. The decreased size of MIL-101 in diluted condition is different to the synthesis of zeolites, probably because MOFs are obtained by a simple process of complexation. Moreover, high pH may be beneficial to produce not only benzenedicarboxylate but also chromium trimers, which are needed for the nucleation of MIL-101 structure. In a selected condition, the MIL-101 having the size of about 50 nm can be obtained facilely and reproducibly with relatively high yield, which may lead to enlarging the applications of the valuable MOF material. (C) 2010 Elsevier B.V. All rights reserved.