Synthesis and characterization of TiO2–montmorillonite nanocomposites and their application for removal of methylene blue
Synthesis and characterization of TiO2–montmorillonite nanocomposites and their application for removal of methylene blue
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DOI：
10.1039/b511426h
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发表时间：
2006-01
影响因子：
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通讯作者：
S. Miao;Zhimin Liu;B. Han;Jianling Zhang;Xin-Yao Yu;Jimin Du;Zhenyu Sun
中科院分区：
文献类型：
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作者：
S. Miao;Zhimin Liu;B. Han;Jianling Zhang;Xin-Yao Yu;Jimin Du;Zhenyu Sun
采用超临界乙醇浸渍法将钛酸四丁酯浸渍到蒙脱土（MMT）层间，然后将前驱体在水中水解，500 °C煅烧，成功制备了TiO 2/MMT纳米复合材料。X射线衍射分析和电子显微镜观察表明，复合材料中蒙脱土的层状结构受到一定程度的破坏。高分辨透射电子显微镜观察表明，粒径小于5 nm的TiO 2颗粒负载在蒙脱土的剥离层中。复合材料的紫外吸收边在325-275 nm范围内发生蓝移。在紫外光照射下，考察了TiO 2-MMT复合材料对亚甲基蓝的去除效果。结果表明，由于蒙脱土对亚甲基蓝的吸附能力和TiO 2对亚甲基蓝的催化降解能力，所制备的样品对亚甲基蓝具有较高的去除效果。
TiO2–montmorillonite (MMT) nanocomposites were successfully prepared via impregnating titanium tetrabutyloxide into the interlayers of MMT with the aid of supercritical ethanol, followed by hydrolysis of the precursor in water and calcination at 500 °C. The X-ray diffraction analysis and electron microscopy observation indicated that the layered structure of MMT was destroyed to some extent in the composites. High-resolution transmission electron microscopy observation showed that the TiO2 particles with size of less than 5 nm were loaded in the exfoliated layers of MMT. The UV absorption edge of TiO2–MMT composites showed a blue shift in the range of 325–275 nm, compared to that of TiO2 particles. The efficiency of the TiO2–MMT composites to remove methylene blue from its aqueous solution was investigated under UV irradiation. It was demonstrated that the as-prepared samples exhibited high efficiency to remove methylene blue due to the adsorptive capacity of MMT and the catalytic degradation ability of TiO2 for methylene blue.