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首页> 外文期刊>RSC Advances >Self-template synthesis of ATiO3 (A = Ba, Pb and Sr) perovskites for photocatalytic removal of NO
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Self-template synthesis of ATiO3 (A = Ba, Pb and Sr) perovskites for photocatalytic removal of NO

机译：自模板合成ATiO 3 （A = Ba，Pb和Sr）钙钛矿用于光催化去除NO

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In this study, we report a self-template hydrothermal method for the synthesis of ATiO3 (A = Ba, Pb, and Sr) perovskites using anatase TiO2 nanosheets as precursors. Under hydrothermal conditions, ATiO3 with different structures and morphology can be obtained. These samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The growth mechanism of ATiO3 was explored by XRD evaluation over different reaction time, and it was observed that PbTiO3 grows most slowly among all the samples including BaTiO3, SrTiO3, BaxPb1?xTiO3 and SrxPb1?xTiO3. The diffusion of A site sources to the solid surface and the reaction at solid/liquid interface could dominate the growth of ATiO3. All the as-prepared samples exhibited activities toward photocatalytic oxidation of NO at ppb level. Specifically, PbTiO3 has revealed the highest activity under both full spectrum and visible-light irradiation (λ > 420 nm), whereas BaTiO3 exhibited best selectivity for the formation of ionic species (NO3?), which could be ascribed to different electronic structures and charge separation efficiency of ATiO3. This study provides some important hints to tune the photocatalytic performances (activity and selectivity) of ATiO3 through the modification of A site elements.
机译：在这项研究中，我们报告了一种使用锐钛矿型TiO <的自模板水热法合成ATiO 3 （A = Ba，Pb和Sr）钙钛矿的方法sub> 2 纳米片作为前体。在水热条件下，可获得结构和形态不同的ATiO 3 。这些样品通过X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术进行了表征。通过X射线衍射研究了不同反应时间下ATiO 3 3 在所有样品中生长最慢，包括BaTiO 3 ，SrTiO 3 ，Ba x Pb 1？ x TiO 3 < / sub> 和Sr x Pb 1？ x TiO 3 。 A位点源向固相表面的扩散和固液界面反应可主导ATiO 3 的生长。所有制备的样品均表现出对ppb级NO的光催化氧化活性。具体而言，PbTiO 3 在全光谱和可见光照射下（λ 3 对形成离子物种表现出最佳选择性（NO 3 ？ ），这可能归因于ATiO 3 的不同电子结构和电荷分离效率。这项研究为通过修饰A位元素调节ATiO 3 的光催化性能（活性和选择性）提供了重要的提示。

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