| 介孔锆柱撑钛酸盐材料的制备、表征及光催化性能 |
| Preparation, Characterization and Photocatalytic Activity of Mesoporous Zr-Pillared Titanate |
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| 摘要: 采用单分子层剥离-重堆积技术将聚合羟基锆离子嵌入到钛酸盐板层间,制得层间距为1.92~2.01 nm的介孔钛酸盐柱撑复合材料。X-射线衍射(XRD)、热重-示差扫描热分析(TG-DSC)、扫描/透射电镜(SEM/HR-TEM)和N2吸附等手段对材料物化性质进行了分析。结果表明,客体锆离子主要以[Zr4(OH)16-n(H2O)8+n]n+(记为Zr4)的形式存在于主体层间域中,且柱撑体系中nZr/nTi比越小,越有利于获得层间距和比表面积较大的柱撑材料。紫外光降解亚甲基蓝实验表明,柱撑材料对亚甲基蓝降解率为钛酸盐主体的3.5倍,这与柱撑形成的介孔结构以及主客体间的电子耦合有关;350 ℃热处理后材料对亚甲基蓝的降解率进一步提高,说明主客体间形成了更有效的欧姆接触。 |
| 关键词: 钛酸盐 羟基锆离子 剥离-重堆积 介孔材料 光催化剂 |
| 基金项目: 国家自然科学基金(No.50872037)和华侨大学校级课题(No.09X0287)资助项目。 |
| Abstract: To fabricate mesoporous nanocomposite with the exfoliation-restacking route, the exfoliated layered titanate in aqueous solution was reassembled in the presence of the hydroxyl-Zr oligocations, with the interlayer space of 1.92 to 2.01 nm. The resulting material was characterized by powder X-ray diffraction, differential scanning calorimetry/thermogravimetric analysis, scanning electron microscope/transmission electron microscopy, and IR specific surface area and porosity measurements. The results suggested that the hydroxyl-Zr oligocations has intercalated into the interlayer galleries between the titanate host layers, and a lower molar ratio of Zr/Ti reaction stoichiometry will result in the pillared material with a larger interlayer space and specific surface area. The results of degradation of methylene blue under ultraviolet and visible radiation show that the present nanocomposite exhibits 3.5 times higher photocatalytic activities than that of layered titanate alone, which are based on the mesoporous structure and electronic coupling between the host and the guest species. The photocatalytic activity of the sample which is treated under 350 ℃ is greater than before, indicating that the heat treatment will increase the ohmic contact between the host and the guest components, thus further enhancing the photocatalytic activity of the material. |
| Keywords: titanate hydroxyl-Zr oligocations exfoliation-restacking mesoporous materials photocatalyst |
| 投稿时间：2014-02-15 修订日期：2014-06-12 |
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| 何丽雯,孙东亚,林碧洲.介孔锆柱撑钛酸盐材料的制备、表征及光催化性能[J].无机化学学报,2014,30(11):2489-2497. |
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