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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Enhanced near-infrared photocatalysis of NaYF_4:Yb, Tm/CdS/TiO_2 composites
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Enhanced near-infrared photocatalysis of NaYF_4:Yb, Tm/CdS/TiO_2 composites

机译：NaYF_4：Yb，Tm / CdS / TiO_2复合材料的增强近红外光催化作用

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摘要

The previous works by our group (Chem. Commun., 2010, 46, 2304-2306; ACS Catal., 2013, 3, 405-412; Phys. Chem. Chem. Phys., 2013, 15, 14681-14688) have reported the near-infrared-driven photocatalysis of broadband semiconductor TiO_2 or ZnO that was combined with upconverting luminescence particles to form a core-shell structure. However, the photocatalytic efficiency is low for this new type of photocatalysts. In this work, NaYF_4:Yb,Tm/CdS/TiO_2 composites for NIR photocatalysis were prepared by linking CdS and TiO_2 nanocrystals on the NaYF_4:Yb,Tm microcrystal surfaces. CdS and TiO_2 were well interacted to form a heterojunction structure. The energy transfer between NaYF_4:Yb,Tm and the semiconductors CdS and TiO_2 was investigated by steady-state and dynamic fluorescence spectroscopy. The photocatalytic activities of the as-prepared composites were evaluated by the degradation of methylene blue in aqueous solution upon NIR irradiation. Significantly, it was found that the united adhesions of CdS and TiO_2 on the NaYF_4:Yb,Tm particle surfaces showed much higher catalytic activities than the individual adhesion of CdS or TiO_2 on the NaYF_4:Yb,Tm surfaces. This was attributed mainly to the effective separation of the photogenerated electron-hole pairs due to the charge transfer across the CdS-TiO_2 interface driven by the band potential difference between them. The presented composite structure of upconverting luminescence materials coupled with narrow/wide semiconductor heterojunctions provides a new model for improved NIR photocatalysis.
机译：我们小组以前的著作（Chem。Commun。，2010，46，2304-2306; ACS Catal。，2013，3，405-412; Phys.Chem.Chem.Phys。，2013，15，15，14681-14688）有报道了宽带半导体TiO_2或ZnO的近红外驱动光催化，其与上转换发光粒子结合形成核-壳结构。但是，这种新型的光催化剂的光催化效率低。在这项工作中，通过在NaYF_4：Yb，Tm微晶表面上连接CdS和TiO_2纳米晶体，制备了用于NIR光催化的NaYF_4：Yb，Tm / CdS / TiO_2复合材料。 CdS和TiO_2相互作用良好，形成异质结结构。通过稳态和动态荧光光谱研究了NaYF_4：Yb，Tm与半导体CdS和TiO_2之间的能量转移。通过在NIR照射下降解水溶液中的亚甲蓝来评估所制备复合材料的光催化活性。显着地，发现CdS和TiO_2在NaYF_4：Yb，Tm颗粒表面上的结合粘附表现出比CdS或TiO_2在NaYF_4：Yb，Tm表面上的单独粘附更高的催化活性。这主要归因于光生电子-空穴对的有效分离，这是由于电荷之间跨过CdS-TiO_2界面的带电势差所引起的，因此电荷转移有效。提出的上转换发光材料与窄/宽半导体异质结的复合结构为改善近红外光催化性能提供了新的模型。

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