| 双亲性w/o-SiO2-void-TiO2中空核壳微球的合成及表征 |
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| 引用本文： | 马占营,姚秉华,张萍. 双亲性w/o-SiO2-void-TiO2中空核壳微球的合成及表征[J]. 无机材料学报, 2014, 29(4): 364-370. DOI: 10.3724/SP.J.1077.2014.13373 |
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| 作者姓名： | 马占营 姚秉华 张萍 |
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| 作者单位： | (1. 西安理工大学 应用化学系, 西安710054; 2. 咸阳师范学院 化学与化工学院, 咸阳712000) |
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| 基金项目： | 陕西省科技厅攻关项目(2011K17-03-02);陕西省教育厅科学研究基金(2013JK0690);国家自然科学基金(21305117)~~ |
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| 摘 要： | 采用双层包裹–夹层去除法合成了SiO2-void-TiO2中空核壳微球, 通过正十八烷基三甲氧基硅烷对SiO2-void-TiO2微球表面进行部分修饰, 制得了双亲性w/o-SiO2-void-TiO2中空核壳微球, 并采用XRD、TEM、BET、FT-IR和UV-Vis DRS等对样品的晶相结构、形貌、表面结构和吸光性能等进行了表征。以染料亚甲基蓝模拟环境污染物, 考察了SiO2-void-TiO2和w/o-SiO2-void-TiO2在紫外光下的光催化性能。结果表明: SiO2-void-TiO2样品呈微球状, 具有明显的核–多孔壳结构, 在核与多孔壳层之间存在纳米空间层, 样品中TiO2核具有锐钛矿结构; w/o-SiO2-void-TiO2样品具有双亲性, 能分布于水/油两相界面处。在紫外光照射下, 反应180 min, SiO2-void-TiO2和w/o-SiO2-void-TiO2对亚甲基蓝的降解率分别达89.4% 和83.8%。在此基础上, 本研究探讨了SiO2-void-TiO2中空核壳微球的合成机理及表面部分改性机理。
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| 关 键 词： | 双亲性 核壳微球 光催化 合成 |
| 收稿时间： | 2013-07-18 |
| 修稿时间： | 2013-10-08 |
Preparation and Characterization of Amphiphilic w/o-SiO2-void-TiO2 Core-shell Microspheres |
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| MA Zhan-Ying,YAO Bing-Hua,ZHANG Ping. Preparation and Characterization of Amphiphilic w/o-SiO2-void-TiO2 Core-shell Microspheres[J]. Journal of Inorganic Materials, 2014, 29(4): 364-370. DOI: 10.3724/SP.J.1077.2014.13373 |
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| Authors: | MA Zhan-Ying YAO Bing-Hua ZHANG Ping |
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| Affiliation: | (1. Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710054, China; 2. College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China) |
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| Abstract: | SiO2-void-TiO2 core-shell microspheres were successfully prepared via double-coating with polyfurfuryldehyde and silica, and then removing the mid-layer to create a nanovoid layer between TiO2 core and silica shell. The surfaces of SiO2-void-TiO2 were modified by partial alkylsilylation of n-octadecyltrimethoxysilane to render the surface with amphiphilicity to prepare w/o-SiO2-void-TiO2. Both the SiO2-void-TiO2 and the w/o-SiO2-void-TiO2 were characterized using XRD, TEM, BET, FT-IR and UV-Vis DRS techniques. Results demonstrated that the as-prepared SiO2-void-TiO2 and w/o-SiO2-void-TiO2 showed core(TiO2)-hollow-shell(silica) microspherical structure. The w/o-SiO2-void-TiO2 sample was amphiphilic core-shell microspheres and it could be easily located at the boundary of the dual-phase mixture. Under UV light irradiation for 180 min, the methylene blue degradation rate of SiO2-void-TiO2 and w/o-SiO2-void-TiO2 photocatalysis reached 89.4% and 83.8%, respectively. Based on these results, possible mechanisms of SiO2-void-TiO2 core-hollow-shell microspheres formation and partial modification were discussed. |
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| Keywords: | amphiphilic core-shell microsphere photocatalysis preparation |
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