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首页> 外文期刊>ACS applied materials & interfaces >Dependence of Dye Molecules Adsorption Behaviors on Pore Characteristics of Mesostructured MOFs Fabricated by Surfactant Template
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Dependence of Dye Molecules Adsorption Behaviors on Pore Characteristics of Mesostructured MOFs Fabricated by Surfactant Template

机译：染料分子吸附行为对表面活性剂模板制造的腹腔结构MOF的孔特性的依赖性

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摘要

In- this work, mesostructured metal-organic frameworks (MOFs) of MIL-101-Crs with different specific surface areas were synthesized successfully under solvothermal conditions using cationic surfactant cetyltrimethyl ammonium bromide (CTAB) as a structural template. It was found that crystallinity degrees, specific surface areas, and pore size distributions strongly depended on the loading of CTAB. Nitrogen adsorption and positron annihilation lifetime spectroscopy (PALS) results showed that the mean mesopore size increased with loading more CTAB due to the formation of larger templated mesopores. Although Langmuir adsorption of both methylene blue (MB) and methyl orange (MO) was confirmed in MIL-101-Crs, the experimental results showed different adsorption behaviors for them depending on the dye molecular size, pore structure, and charge properties of dye molecules/MOFs in solution. The MB molecules were found to be mainly adsorbed in the interspaces between grains and the templated mesopores, whereas the MO molecules were adsorbed in the inherent pores as well as the templated ones in MOFs due to the unsaturated metal sites' electrostatic attraction on them. Remarkably, MO adsorption capacity was observed to be proportional to the specific surface area, which allowed one to get a good linear fitting of experimental data. Interestingly, the good consistence between the fitting experimental parameter, that is, the number of adsorbed MO(-)s per unit specific surface area, and the calculated one according to our rough estimation strongly suggests that MO(-)s are electrostatically attracted and rotating around the unsaturated metal sites on MOFs' inner surfaces, which exclude other MO(-)s to be adsorbed around due to the "hindering effect" of the rotating motion.
机译：在此作品中，使用阳离子表面活性剂十六烷基溴化铵（CTAB）作为结构模板，在溶剂热的条件下在溶剂热条件下成功合成MIL-101-Crs的MEMOStructued金属 - 有机框架（MOF）。发现结晶度，比表面积和孔径分布强烈依赖于CTAB的装载。氮吸附和正电子湮没寿命光谱（PALS）结果表明，由于形成较大的模板化的中孔，平均中孔尺寸随着加载更多CTAB而增加。虽然在MIL-101-CRS中确认了甲基蓝（Mb）和甲基橙（Mo）的朗米尔吸附，但实验结果根据染料分子大小，孔结构和染料分子的电荷性能显示出不同的吸附行为/ mof在解决方案中。发现MB分子主要吸附在谷物和模板化的中孔之间的间隙中，而由于不饱和金属位点对它们的静电吸引，Mo分子被吸附在固有的孔中以及模板中。值得注意地，观察到莫吸附能力与特定表面积成比例，这使得一个允许获得实验数据的良好线性拟合。有趣的是，拟合实验参数之间的良好一致性，即每单位特异性表面积的吸附Mo（ - ）S的数量，以及根据我们粗略估计的计算结果强烈表明Mo（ - ）S静电吸引和在MoF的内表面上的不饱和金属位置围绕不饱和金属位点旋转，其排除由于旋转运动的“阻碍效果”而被吸附的其他Mo（ - ）s。

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  • 来源
    《ACS applied materials & interfaces》 |2019年第34期|共11页
  • 作者

    Zhang Xiaowei; Xiong Bangyun; Li Jingjing; Qian Libing; Liu Lei; Liu Zhe; Fang Pengfei; He Chunqing;

  • 作者单位

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

    Foshan Univ Sch Mat Sci &

    Energy Engn Foshan 528000 Peoples R China;

    Foshan Univ Sch Mat Sci &

    Energy Engn Foshan 528000 Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Key Lab Nucl Solid State Phys Hubei Prov Wuhan 430072 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    positron annihilation; dye; Langmuir adsorption; electrostatic attraction; MOFs; micropore and mesopore; template;

    机译：正电子湮没;染料;Langmuir吸附;静电吸引力;MOF;微孔和中孔;模板;

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