轻松制备 TiO2 量子点锚定 g-C3N4 纳米片作为 0D/2D 异质结纳米复合材料以加速太阳能驱动光催化,Nanomaterials

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轻松制备 TiO2 量子点锚定 g-C3N4 纳米片作为 0D/2D 异质结纳米复合材料以加速太阳能驱动光催化
Nanomaterials ( IF 4.4 ) Pub Date : 2023-05-06 , DOI: 10.3390/nano13091565
Jin-Hyoek Lee ₁ , Sang-Yun Jeong ₁ , Young-Don Son ₂ , Sang-Wha Lee ₁

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由于 TiO2 半导体带隙大且电子-空穴对复合速度快，因此在可见光下催化活性水平较低。本文报道了通过将 TiO2 量子点 (QD) 锚定在类石墨 C3N4 (g-C3N4) 纳米片 (NSs) 上，简单制造 0D/2D 异质结光催化剂；光催化剂记为TiO2 QDs@g-C3N4。通过粉末X射线衍射、X射线光电子能谱、扫描电子显微镜、透射电子显微镜等分析仪器对纳米复合材料进行了表征，比较了太阳光下的t橙（MO）。TiO2 QDs@g-C3N4 光催化剂表现出 95.57% 的 MO 降解效率，活性水平分别比 TiO2 QDs 和 g-C3N4 NSs 高 3.3 倍和 5.7 倍。具有交错电子结构的零维/二维异质结形成导致光生电荷载流子通过 Z 型路径有效分离，这显着加速了太阳光下的光催化。本研究为合理设计具有增强的太阳能驱动催化活性的 0D/2D 异质结纳米复合材料提供了一种简便的合成方法。

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Facile Fabrication of TiO2 Quantum Dots-Anchored g-C3N4 Nanosheets as 0D/2D Heterojunction Nanocomposite for Accelerating Solar-Driven Photocatalysis

TiO₂ semiconductors exhibit a low catalytic activity level under visible light because of their large band gap and fast recombination of electron–hole pairs. This paper reports the simple fabrication of a 0D/2D heterojunction photocatalyst by anchoring TiO₂ quantum dots (QDs) on graphite-like C₃N₄ (g-C₃N₄) nanosheets (NSs); the photocatalyst is denoted as TiO₂ QDs@g-C₃N₄. The nanocomposite was characterized via analytical instruments, such as powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, t orange (MO) under solar light were compared. The TiO₂ QDs@g-C₃N₄ photocatalyst exhibited 95.57% MO degradation efficiency and ~3.3-fold and 5.7-fold higher activity level than those of TiO₂ QDs and g-C₃N₄ NSs, respectively. Zero-dimensional/two-dimensional heterojunction formation with a staggered electronic structure leads to the efficient separation of photogenerated charge carriers via a Z-scheme pathway, which significantly accelerates photocatalysis under solar light. This study provides a facile synthetic method for the rational design of 0D/2D heterojunction nanocomposites with enhanced solar-driven catalytic activity.

更新日期：2023-05-06

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