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Morphology Design of IRMOF?3 Crystal by Coordination Modulation

机译:IRMOF?3晶体的配位调制形态设计

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A one-pot synthesis design on shape-controlled growth of Zn-based isoreticular metal?organic framework (i.e., IRMOF-3) was carried out in this work with the controllable crystal morphological evolution from simple cubes to several complex shapes. A new synthetic protocol was devised where poly(vinylpyrrolidone) (PVP), noble metal source (AgNO3), mixed solvents (N,N-dimethylformamide (DMF)?ethanol mixture) and tetramethylammonium bromide (TMAB) were mutually introduced to the reaction medium as surfactant, adjuvant, accelerator, and structure-directing agent (SDA), respectively. Meanwhile, the crystallization process was investigated by a series of time-dependent experiments. Indeed, the added modulators and crystallization time were able to regulate the growth and thus the morphology of the final products. The resulting homogeneous IRMOF-3-Ag-n materials with unique and novel crystal morphologies were characterized via scanning electron microscopy (SEM), X-ray powder diffraction (XRD), thermogravimetric and differential thermal analyses (TG-DTA), transmission electron microscopy (TEM), infrared spectrum (IR), and optical microscope characterizations. Various shapes of IRMOF-3-Ag-n crystals as sorbents for capturing dibenzothiophene (DBT) were evaluated. Among all the morphology-controlled samples, IRMOF-3-Ag-5 with hollow sphere morphology was demonstrated to show the highest DBT capture capacity due to its unique morphology.
机译:在这项工作中,对锌基等网状金属有机骨架(即IRMOF-3)的形状受控生长进行了一锅合成设计,使晶体形态可控地从简单的立方体转变为几种复杂的形状。设计了一种新的合成方案,其中将聚乙烯吡咯烷酮(PVP),贵金属源(AgNO3),混合溶剂(N,N-二甲基甲酰胺(DMF)?乙醇混合物)和四甲基溴化铵(TMAB)相互引入反应介质中分别用作表面活性剂,助剂,促进剂和结构导向剂(SDA)。同时,通过一系列随时间变化的实验研究了结晶过程。实际上,添加的调节剂和结晶时间能够调节生长,从而调节最终产物的形态。通过扫描电子显微镜(SEM),X射线粉末衍射(XRD),热重和差热分析(​​TG-DTA),透射电子显微镜对形成的具有独特且新颖的晶体形态的均质IRMOF-3-Ag-n材料进行表征(TEM),红外光谱(IR)和光学显微镜表征。评估了各种形状的IRMOF-3-Ag-n晶体作为用于捕获二苯并噻吩(DBT)的吸附剂。在所有由形态控制的样品中,具有空心球形态的IRMOF-3-Ag-5被证明由于其独特的形态显示出最高的DBT捕获能力。

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