Rapid and selective adsorption of cationic dyes by a unique metal-organic framework with decorated pore surface
Rapid and selective adsorption of cationic dyes by a unique metal-organic framework with decorated pore surface
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DOI：
10.1016/j.apsusc.2018.01.258
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发表时间：
2018-05
影响因子：
6.7
通讯作者：
Jie Zhang;Fan Li;Qian Sun
中科院分区：
文献类型：
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作者：
Jie Zhang;Fan Li;Qian Sun
有机染料污染物因其对环境的毒性而成为一个令人头疼的问题，如果我们能够去除和分离它们，应该是最好的解决方案之一。本文直接合成了基于芴酮-2,7-二羧酸酯配体的带有羰基的金属有机骨架（MOF）（记为Zn-MOF），无需后合成方法，并用于选择性地从水溶液中吸收MB、CV、RhB等阳离子染料，同时排除阴离子或中性染料。通过X射线衍射、扫描电子显微镜、傅里叶变换红外光谱和元素分析对Zn-MOF进行了表征。 Zn-MOF主要具有开放的孔道、高表面积、大孔体积，最重要的是，孔表面具有由配体产生的羰基，指向骨架大室的中心，有利于阳离子染料的吸附。 MB最大吸附容量可以达到326mgg−1，这可能是由于合适的孔径、较高的溶剂可及空隙以及介孔材料突出的吸附容量。该材料的染料吸附过程被证明是电荷选择性和尺寸选择性的，并且还研究了吸附等温线以及染料吸附到Zn-MOF上的动力学特征。
Organic dye pollutants become a big headache due to their toxic nature to the environment, and it should be one of the best solutions if we can remove and separate them. Here, a metal-organic framework (MOF) (denoted as Zn-MOF) with carbonyl group based on fluorenone-2,7-dicarboxylate ligand, was directly synthesized without post-synthesis method and applied to selectively absorb cationic dyes such as MB, CV, RhB from aqueous solution, while anionic or neutral dyes were excluded. Characterization of the Zn-MOF was achieved by X-ray diffraction, scanning electron microscope, Fourier transform infrared spectrometry and elemental analysis. The Zn-MOF mainly possesses open pore channels, high surface area, big pore volume, and most important, the pore surface is furnished with carbonyl groups arising from the ligand and pointing toward the centers of the large chambers of the framework, which are benefit for the adsorption of the cationic dyes. The MB maximum adsorption capacities can attain 326 mg g−1, which is probably due to the suitable pore size, higher solvent-accessible void, and the prominent adsorption capacity of the mesoporous material. The dye adsorption process for the material is proven to be charge-selective and size-selective, and the adsorption isotherms, as well as kinetics characteristic of dye adsorption onto the Zn-MOF were also investigated.