Abstract Herein we have developed a new type of ternary CaTiO3/g-C3N4/AgBr Z-scheme heterostructured photocatalysts by assembling g-C3N4 nanosheets and AgBr nanoparticles on the surface of CaTiO3 nanocuboids. The structures, micro-morphologies, chemical composition, element valence states, optical properties, surface functional groups and band-edge potentials of the derived CaTiO3/g-C3N4/AgBr photocatalysts were investigated by XRD, SEM, TEM, XPS, FTIR, UV–vis diffuse reflectance spectroscopy and electrochemical measurement. RhB was used as the model pollutant to assess the photodegradation performances of the CaTiO3/g-C3N4/AgBr photocatalysts under simulated sunlight illumination. The optimal sample is observed for CTO/10%CN/50%AgBr, which photocatalyzes 99.6% degradation of RhB after 30 min photoreaction (CRhB = 5 mg L−1, Cphotocatalyst = 0.5 g L−1). The reaction rate constants suggest that the photodegradation activity of the CTO/10%CN/50%AgBr composite is about 28.3, 19.9 and 2.0 times larger than that of bare CaTiO3, g-C3N4 and AgBr, respectively. The enhanced photodegradation performances of the ternary CaTiO3/g-C3N4/AgBr composites can be explained due to the Z-scheme electron transfer mechanism and efficient separation of photoexcited electron/hole pairs.

中文翻译：

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三元CaTiO3/g-C3N4/AgBr Z型异质结构光催化剂的设计及其在染料光降解中的应用

摘要 在此，我们通过在 CaTiO3 纳米长方体表面组装 g-C3N4 纳米片和 AgBr 纳米颗粒，开发了一种新型的三元 CaTiO3/g-C3N4/AgBr Z 型异质结构光催化剂。通过XRD、SEM、TEM、XPS、FTIR、UV研究了衍生的CaTiO3/g-C3N4/AgBr光催化剂的结构、微观形貌、化学组成、元素价态、光学性质、表面官能团和带边电位-可见漫反射光谱和电化学测量。RhB 被用作模型污染物来评估 CaTiO3/g-C3N4/AgBr 光催化剂在模拟日光照射下的光降解性能。观察到最佳样品为 CTO/10%CN/50%AgBr，在 30 分钟光反应后光催化 RhB 降解 99.6%（CRhB = 5 mg L-1，Cphotocatalyst = 0. 5 克 L-1)。反应速率常数表明，CTO/10%CN/50%AgBr 复合材料的光降解活性分别是裸 CaTiO3、g-C3N4 和 AgBr 的约 28.3、19.9 和 2.0 倍。三元CaTiO3/g-C3N4/AgBr复合材料增强的光降解性能可以归因于Z型电子转移机制和光激发电子/空穴对的有效分离。