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One pot microwave-assisted synthesis of Ag decorated yolk@shell structured TiO2 microspheres

机译：一锅微波辅助合成AG装饰yolk @壳结构TiO2微球

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摘要

A facile and economical one-pot microwave-assisted approach for the synthesis of Ag decorated yolk@shell structured TiO2 microspheres (Ag-TS) is reported. The rapid and uniform microwave heating could reduce the reaction time to 30 min, an order of magnitude shorter than that of conventional methods. The characterization data confirmed that the resultant mesoporous structured Ag-TS were highly uniform in size with an average diameter of similar to 0.5 mu m, which was constructed by small anatase TiO2 nanoparticles, along with Ag nanoparticles ranging from 10 to 50 nm homogeneously dispersed on the microspheres. Nitrogen adsorption-desorption measurement revealed that all the Ag-TS samples had high specific surface areas (>100 m(2) g (1)) and abundant mesoporous structures. The growth model of Ag-TS was proposed based on a series of contrast experiments, the unique selective heating of reaction solvent (deionized water and ethanol) by the microwave method was found to be critical. At the initial stage, amorphous solid microspheres were formed by heating of ethanol molecules through absorbing microwave energy due to the better microwave absorbing performance. Then water molecules were heated by the microwave irradiation, the crystallization of anatase TiO2 on the surface of the solid microspheres started, followed by the Ti species diffusing spontaneously towards the outer surface of the solid microspheres and leading to the formation of the outer shell due to the Ostwald ripening process. Finally, water continuously diffused through the outer shell and guided the subsequent crystallization of anatase TiO2, resulting in the formation of the core. Besides, the application of Ag-TS for the removal of water contaminants including toxic heavy metal hexavalent chromium (Cr(VI)) ions and organic dye methylene blue (MB) were also evaluated.
机译：报道了一种用于合成AG装饰yolk @ shell结构TiO2微球（Ag-Ts）的合成合成的容易和经济的一锅微波辅助方法。快速和均匀的微波加热可以将反应时间降低至30分钟，比常规方法短的数量级。表征数据证实，所得介孔结构化Ag-Ts的尺寸高度均匀，平均直径与0.5μm的平均直径相似，其由小锐钛矿TiO2纳米颗粒构成，与均匀分散的Ag纳米颗粒一起构成。微球。氮吸附 - 解吸测量显示，所有Ag-TS样品都具有高比表面积（> 100m（2）g（1））和丰富的介孔结构。基于一系列对比试验提出了AG-TS的生长模型，发现微波法通过微波法进行独特的选择性加热反应溶剂（去离子水和乙醇）至关重要。在初始阶段，通过通过更好的微波吸收性能加热微波能量来形成无定形固体微球。然后通过微波辐射加热水分子，锐钛矿TiO2在固体微球的表面上开始，然后由Ti物种自发地朝向固体微球的外表面扩散，并导致外壳的形成OSTWALD成熟过程。最后，水连续地扩散通过外壳并引导随后的锐钛矿TiO 2结晶，从而形成芯的形成。此外，还评估了AG-TS用于去除包括有毒重金属六价铬（Cr（VI））离子和有机染料亚甲基蓝（MB）的水污染物的应用。

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  • 来源
    《RSC Advances》 |2015年第15期|共9页
  • 作者

    Yang Yong; Wang Guozhong; Gu Gang; Li Qian; Kang Shenghong; Zhang Yunxia; Ng Dickon H. L.; Zhao Huijun;

  • 作者单位

    Chinese Acad Sci Inst Solid State Phys Anhui Key Lab Nanomat &

    Nanotechnol Key Lab Mat Phys Ctr Environm &

    Energy Nanomat Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Anhui Key Lab Nanomat &

    Nanotechnol Key Lab Mat Phys Ctr Environm &

    Energy Nanomat Hefei 230031 Peoples R China;

    Jiangxi Normal Univ Sch Phys Elect &

    Commun Lab Nanomat &

    Sensors Nanchang 330022 Jiangxi Peoples R China;

    Chinese Univ Hong Kong Dept Phys Shatin Hong Kong Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Anhui Key Lab Nanomat &

    Nanotechnol Key Lab Mat Phys Ctr Environm &

    Energy Nanomat Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Anhui Key Lab Nanomat &

    Nanotechnol Key Lab Mat Phys Ctr Environm &

    Energy Nanomat Hefei 230031 Peoples R China;

    Chinese Univ Hong Kong Dept Phys Shatin Hong Kong Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Anhui Key Lab Nanomat &

    Nanotechnol Key Lab Mat Phys Ctr Environm &

    Energy Nanomat Hefei 230031 Peoples R China;

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  • 中图分类 化学;
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