<br>通过Z型异质结结构调节内部电场增强ZnO/Bi3Ti2O8F:Yb3+、Er3+的近红外上转换光催化活性,Journal of Colloid and Interface Science

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通过Z型异质结结构调节内部电场增强ZnO/Bi3Ti2O8F:Yb3+、Er3+的近红外上转换光催化活性
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-06-23 , DOI: 10.1016/j.jcis.2024.06.161
Haomiao Cao ₁ , Zhaoyi Yin ₁ , Xiaoyi Dong ₁ , Yongjin Li ₁ , Yong Yang ₁ , Jianbei Qiu ₁ , Zhengwen Yang ₁ , Zhiguo Song ₁

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探索提高光催化剂近红外响应的策略是一个紧迫的挑战，可以通过利用上转换（UC）发光来增强光催化来克服。本文报道了基于 BiTiOF:Yb, Er (BTOFYE) UC 光催化剂通过静电自组装制备 ZnO/BiTiOF:Yb, Er (ZnO/BTOFYE) Z 型异质结。 BTOFYE和ZnO界面上的费米能差在Z型异质结中产生强大的内电场（IEF），提供了一种新颖的电荷转移模式，促进载流子转移和分离，同时保留强大的氧化还原能力。这些结果通过原位X射线光电子能谱、原位开尔文探针力显微镜、电子自旋共振和密度泛函理论计算得到证实。此外，IEF对Er的UC发光过程的影响增强了发光强度，大大提高了UC利用效率。最佳ZnO/BTOFYE在120分钟内降解环丙沙星64%，是BTOFYE降解量的2.3倍。总体而言，本研究结果为通过在Z型异质结中产生IEF来合理开发高效UC光催化剂提供了参考。

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Enhancing the near-infrared upconversion photocatalytic activity of ZnO/Bi3Ti2O8F:Yb3+, Er3+ by modulating the internal electric field through Z-scheme heterojunction construction

Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/BiTiOF:Yb, Er (ZnO/BTOFYE) Z-scheme heterojunction based on a BiTiOF:Yb, Er (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.

更新日期：2024-06-23

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