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Oxygen‐Deficient Dumbbell‐Shaped Anatase TiO2−x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-01-29 , DOI: 10.1002/chem.201805356 Yongjun Li 1 , Xiaozhou Ye 1 , Shengxin Cao 1 , Chujing Yang 1 , Yun Wang 1 , Jianfeng Ye 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-01-29 , DOI: 10.1002/chem.201805356 Yongjun Li 1 , Xiaozhou Ye 1 , Shengxin Cao 1 , Chujing Yang 1 , Yun Wang 1 , Jianfeng Ye 1
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The development of hierarchical TiO2 superstructures with new morphologies and intriguing photoelectric properties for utilizing solar energy is known to be an effective approach to alleviate the serious problems of environmental pollution. Herein, unique oxygen‐deficient dumbbell‐shaped anatase TiO2−x mesocrystals (DTMCs) enclosed by nearly 100 % {101} facets were readily synthesized by mesoscale transformation in TiCl3/acetic acid (HAc) mixed solution, followed by calcination under vacuum. These mesocrystals exhibited much higher photoreactivity toward removing the model pollutants methyl orange and CrVI than truncated tetragonal bipyramidal anatase nanocrystals (TNCs), anatase mesocrystals built from truncated tetragonal bipyramidal anatase nanocrystals (TTMCs), and anatase mesocrystals constructed by anatase nanocrystals with nearly 100 % exposed {101} facets (TMCs), revealing that both the oxidation and reduction abilities of anatase TiO2 were simultaneously enhanced upon fabricating an oxygen‐deficient mesocrystalline architecture with about 100 % exposed {101} facets. Further characterization illustrated that such an enhancement of photoreactivity was mainly due to the strengthened light absorption, boosted charge carrier separation, and nearly 100 % exposed {101} facets of the oxygen‐deficient dumbbell‐shaped anatase mesocrystals. This work will be useful for guiding the synthesis of oxygen‐deficient ordered superstructures of metal oxides with desired morphologies and exposed facets for promising applications in environmental remediation.
中文翻译：
缺氧的哑铃状锐钛矿型TiO2-x介晶，{100}面的暴露率接近100％：合成，生长机理和光催化性能
开发具有新形貌和引人入胜的光电性质以利用太阳能的分层TiO 2上层结构是缓解严重环境污染问题的有效方法。本文中，通过在TiCl 3 /乙酸（HAc）混合溶液中进行中尺度转化，然后在真空下煅烧，可以容易地合成被几乎100％{101}晶面包围的独特的缺氧哑铃形锐钛矿型TiO 2 x介观晶体（DTMC）。。这些非晶表现出高得多的光反应性朝向去除模型污染物甲基橙和Cr VI比截顶的四角锥双锥锐钛矿纳米晶体（TNCs），由截顶的四角锥双锥锐钛矿纳米晶体（TTMCs）形成的锐钛矿介晶和锐钛矿的纳米晶（锐钛矿纳米晶具有{100}面（TMCs）接近100％暴露）形成的锐钛矿介晶。锐钛矿型TiO 2的能力在制造具有约100％暴露的{101}晶面的缺氧中晶结构时，可同时增强这些元素。进一步的表征表明，这种光反应性的增强主要是由于光吸收增强，电荷载流子分离增强以及缺氧哑铃形锐钛矿型中间晶体的近100％暴露的{101}面。这项工作对于指导合成具有理想形态和裸露面的缺氧有序金属氧化物超结构很有用，可用于环境修复。
更新日期：2019-01-29
中文翻译：
缺氧的哑铃状锐钛矿型TiO2-x介晶，{100}面的暴露率接近100％：合成，生长机理和光催化性能
开发具有新形貌和引人入胜的光电性质以利用太阳能的分层TiO 2上层结构是缓解严重环境污染问题的有效方法。本文中，通过在TiCl 3 /乙酸（HAc）混合溶液中进行中尺度转化，然后在真空下煅烧，可以容易地合成被几乎100％{101}晶面包围的独特的缺氧哑铃形锐钛矿型TiO 2 x介观晶体（DTMC）。。这些非晶表现出高得多的光反应性朝向去除模型污染物甲基橙和Cr VI比截顶的四角锥双锥锐钛矿纳米晶体（TNCs），由截顶的四角锥双锥锐钛矿纳米晶体（TTMCs）形成的锐钛矿介晶和锐钛矿的纳米晶（锐钛矿纳米晶具有{100}面（TMCs）接近100％暴露）形成的锐钛矿介晶。锐钛矿型TiO 2的能力在制造具有约100％暴露的{101}晶面的缺氧中晶结构时，可同时增强这些元素。进一步的表征表明，这种光反应性的增强主要是由于光吸收增强，电荷载流子分离增强以及缺氧哑铃形锐钛矿型中间晶体的近100％暴露的{101}面。这项工作对于指导合成具有理想形态和裸露面的缺氧有序金属氧化物超结构很有用，可用于环境修复。
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