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首页> 外文期刊>RSC Advances >Fabrication of poly(methyl methacrylate)/silica KIT-6 nanocomposites via in situ polymerization approach and their application for removal of Cu2+ from aqueous solution
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Fabrication of poly(methyl methacrylate)/silica KIT-6 nanocomposites via in situ polymerization approach and their application for removal of Cu2+ from aqueous solution

机译：原位聚合法制备聚甲基丙烯酸甲酯/二氧化硅KIT-6纳米复合材料及其在水溶液中去除Cu2 +的应用

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摘要

In this study, three types of novel mesoporous silica nanocomposites (called MSNCs) based on poly(methyl methacrylate) and modified mesoporous silica KIT-6 were prepared. The chemical, structural and textural properties of MSNCs were characterized by several methods including FT-IR spectroscopy, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Experimental results showed that MSNCs have many active sites on their surface and this feature has a promising future for targeting applications like adsorption. Accordingly, its application for adsorption of Cu(II) from aqueous solution was examined. The adsorption behavior of Cu(II) onto pure KIT-6, modified KIT-6 (called m-KIT-6) and three types of MSNCs was investigated by kinetic and isotherm studies. It was observed that the adsorption equilibrium is short (15 and 30 min for m-KIT-6 and pure KIT-6, respectively and 60-90 min for MSNCs). Adsorption kinetics was fitted by a pseudo second order kinetic equation. Also, the maximum adsorptive capacities of the three types of MSNCs were 79.14%, 91.20% and 81.72%, respectively. And finally, the resulting adsorption isotherms of the MSNCs as well as of pure KIT-6 and m-KIT-6 were found to best fit the Langmuir isotherm model.
机译：在这项研究中，制备了三种基于聚甲基丙烯酸甲酯和改性介孔二氧化硅KIT-6的新型介孔二氧化硅纳米复合材料（称为MSNC）。 MSNC的化学，结构和质地特性通过多种方法进行了表征，包括FT-IR光谱，场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），X射线衍射（XRD）和热重分析（ TGA）。实验结果表明，MSNCs在其表面上有许多活性位，这一特性对于靶向应用（如吸附）具有广阔的前景。因此，研究了其在水溶液中吸附Cu（II）的应用。通过动力学和等温线研究了Cu（II）在纯KIT-6，修饰的KIT-6（称为m-KIT-6）和三种类型的MSNC上的吸附行为。观察到吸附平衡很短（m-KIT-6和纯KIT-6分别为15和30分钟，MSNCs为60-90分钟）。吸附动力学通过伪二级动力学方程拟合。另外，三种类型的MSNC的最大吸附能力分别为79.14％，91.20％和81.72％。最后，发现MSNC以及纯KIT-6和m-KIT-6的吸附等温线最适合Langmuir等温线模型。

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