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首页> 外文期刊>RSC Advances >A novel hydrolytic reaction to morphology-controlled TiO2 micro/nanostructures for enhanced photocatalytic performances
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A novel hydrolytic reaction to morphology-controlled TiO2 micro/nanostructures for enhanced photocatalytic performances

机译：一种新的水解反应，与形态控制的TiO2微/纳米结构进行增强的光催化性能

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摘要

Different TiO2 micro/nanostructures have been hydrothermally prepared through controlling the hydrolysis and nucleation rate of Ti4+ ions by urea and H2O2 in a (NH4)(2)TiF6 aqueous solution. Anatase TiO2 nanorods with diameters of 10-30 nm and lengths up to 300-500 nm were evolved from the intermediate monoclinic H2Ti5O11 center dot 3H(2)O in the presence of H2O2 and urea, whereas TiO2 core-shell nanospheres with diameters of 300-500 nm were obtained with the sole assistance of urea via the Ostwald ripening effect and TiO2 microspheres with diameters of about 1-2 mm were formed in the presence of only H2O2. Photocatalytic degradation of Rhodamine B (RhB) has been used to evaluate their activities. The results indicate that the anatase TiO2 nanorods have superior photocatalytic efficiency to the core-shell nanospheres and microspheres counterparts owing to their larger specific surface area and higher yield of cOH radicals. This work not only offers a simple and promising route to the controllable synthesis of various TiO2 architectures, but also provides new insight for improving the photocatalytic performance of TiO2 through morphological engineering, which will have potential applications in environmental remediation.
机译：通过在（NH 4）（2）TIF6水溶液中通过尿素和H 2 O 2控制Ti4 +离子的水解和成核速率，通过控制Ti4 +离子的水解和成核速率来加湿不同的TiO 2微/纳米结构。在H 2 O 2和尿素存在下，从中间体单斜晶型H2Ti5O11中间点3h（2）o产生10-30nm和长度高达300-500nm的锐钛矿TiO2纳米棒，而直径为300的TiO2核心壳纳米球通过通过OSTWALD成熟效应的尿素唯一的辅助获得-500nm，在仅H2O2的存在下形成直径约1-2mm的TiO2微球。罗丹明B（RHB）的光催化降解已被用于评估其活性。结果表明，由于其较大的比表面积和富含COH自由基产量，锐钛矿TiO2纳米码对核心 - 壳纳米球和微球对应物具有优异的光催化效率。这项工作不仅提供了可控制的各种TiO2架构的可控合成的简单和有希望的路线，而且还提供了新的洞察力，用于通过形态学工程改善TiO2的光催化性能，这将在环境修复中具有潜在的应用。

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  • 来源
    《RSC Advances》 |2015年第54期|共9页
  • 作者

    Cheng He; Chen Gongde; Zhang Weixin; Qiu Maoqin; Yang Zeheng; Zhu Xiao; Ma Guo; Fu Yu;

  • 作者单位

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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