Abstract Graphitic carbon nitride (g-C3N4) was deposited onto TiO2 nanotube arrays (TNTAs) by a simple impregnation method to afford a Z-scheme g-C3N4/TNTAs photocatalytic system. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectrum, and X-ray photoelectron spectroscopy (XPS). The g-C3N4/TNTAs exhibit improved efficiency for photodegradation of Rh B under visible light irradiation comparing with bare TiO2 nanotube arrays, and CN(10)/TNTAs prepared by 10 times impregnation show the highest activity. The enhanced visible light photocatalytic activity is attributed to the optimized light absorption and effective separation of photogenerated electrons and holes. This article demonstrates a simple way to prepare the Z-scheme heterogeneous photocatalyst with improved performance for potential application in environmental control.

中文翻译：

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通过简单的浸渍方法提高 Z 型 g-C3N4 装饰的 TiO2 纳米管阵列的可见光光催化活性

摘要 通过简单的浸渍方法将石墨氮化碳 (g-C3N4) 沉积到 TiO2 纳米管阵列 (TNTAs) 上，以提供 Z 型 g-C3N4/TNTAs 光催化体系。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外-可见漫反射光谱和X射线光电子能谱（XPS）对光催化剂进行表征。与裸 TiO2 纳米管阵列相比，g-C3N4/TNTAs 在可见光照射下光降解 RhB 的效率更高，并且通过 10 次浸渍制备的 CN(10)/TNTAs 显示出最高的活性。增强的可见光光催化活性归因于优化的光吸收和光生电子和空穴的有效分离。