Shape-controlled synthesis of α-Fe2O3 nanocrystals for efficient adsorptive removal of Congo red
Shape-controlled synthesis of α-Fe2O3 nanocrystals for efficient adsorptive removal of Congo red
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DOI：
10.1039/c5ra06324h
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发表时间：
2015-06
期刊：
影响因子：
3.9
通讯作者：
Jintao Wang;Lei Xu;Zaiyong Zhang;P. Sun;Min Fang;Hongke Liu
中科院分区：
文献类型：
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作者：
Jintao Wang;Lei Xu;Zaiyong Zhang;P. Sun;Min Fang;Hongke Liu
以小分子有机化合物2，4，6-三（吡唑-1-基）-1，3，5-三嗪（Tptz）为模板剂，采用溶剂热法在较低温度下合成了α-Fe 2 O3纳米晶。通过简单改变反应溶剂N，N-二甲基甲酰胺（DMF）和水的体积比，得到了3种不同形貌的α-Fe 2 O3纳米晶。采用X射线粉末衍射（PXRD）、红外光谱（IR）、高分辨透射电子显微镜（HRTEM）和场发射扫描电子显微镜（FESEM）对样品的纯度和形貌进行了表征。值得注意的是，模板Tptz配体和混合溶剂的体积比在本工作中对产物的形成和形貌控制起着非常重要的作用。此外，对刚果红的吸附实验表明，纳米多面体、纳米棒和米粒状样品的吸附容量依次增大。米状α-Fe 2 O3的最大吸附容量为161 mg g−1，比表面积最大为110.2 m2 g−1。这些α-Fe_2O_3纳米晶有可能作为一种低成本、高效率的吸附材料用于去除水中的有机污染物。
A facile solvothermal reaction was developed to synthesize α-Fe2O3 nanocrystals at relatively low temperature in the presence of small organic compound 2,4,6-tris(pyrazol-1-yl)-1,3,5-triazine (Tptz) as template. α-Fe2O3 nanocrystals with three different morphologies were obtained by simply changing the volume ratio of the reaction solvents, N,N-dimethylformamide (DMF) and H2O. The purities and morphologies of these samples were characterized by powder X-ray diffraction (PXRD), infrared spectrum (IR), high-resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM). It is remarkable that both the template Tptz ligand and the volume ratios of the mixture solvents are playing very significant roles for the formation and the morphological control of the products in this work. Furthermore, Congo red adsorption experiment showed that the adsorption capacities increased in an order of the samples with morphologies of nanopolyhedra, nanorods and rice-shaped. And the determined maximum adsorption capacity is up to 161 mg g−1 for the rice-shaped α-Fe2O3, which has the biggest BET surface area of 110.2 m2 g−1. These α-Fe2O3 nanocrystals reported here may have the potential to use as low-cost and efficient adsorbent materials to remove organic pollutants from water.