Yuan Xiaoya, Zhou Chao, Jing Qiuye, Tang Qi, Mu Yuanhua, Du An-Ke
College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Chongqing Academy of Science and Technology, Chongqing 401123, China.
Nanomaterials (Basel). 2016 Sep 14;6(9):173. doi: 10.3390/nano6090173.
Graphitic-C₃N₄ nanosheets (CN)/ZnO photocatalysts (CN/ZnO) with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C₃N₄ nanosheets. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL). The results showed that hexagonal wurzite-phase ZnO nanoparticles were randomly distributed onto the CN nanosheets with a well-bonded interface between the two components in the CN/ZnO composites. The performance of the photocatalytic Cr(VI) reduction indicated that CN/ZnO exhibited better photocatalytic activity than pure ZnO under visible-light irradiation and the photocatalyst composite with a lower loading of CN sheets eventually displayed higher activity. The enhanced performance of CN/ZnO photocatalysts could be ascribed to the increased absorption of the visible light and the effective transfer and separation of the photogenerated charge carriers.
通过在剥离的C₃N₄纳米片存在下进行简单的沉淀-煅烧，成功制备了具有不同CN负载量的石墨相C₃N₄纳米片（CN）/ZnO光催化剂（CN/ZnO）。通过粉末X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（DRS）和光致发光光谱（PL）对其形貌和结构进行了全面表征。结果表明，六方纤锌矿相ZnO纳米颗粒随机分布在CN纳米片上，且在CN/ZnO复合材料中两种组分之间具有良好结合的界面。光催化还原Cr(VI)的性能表明，在可见光照射下，CN/ZnO比纯ZnO表现出更好的光催化活性，且CN片负载量较低的光催化剂复合材料最终表现出更高的活性。CN/ZnO光催化剂性能的增强可归因于可见光吸收的增加以及光生电荷载流子的有效转移和分离。
