DataSheet1_Hollow Dodecahedra Graphene Oxide- Cuprous Oxide Nanocomposites With Effective Photocatalytic and Bactericidal Activity.docx

In this study, a kind of graphene oxide-cuprous oxide (GO-Cu2O) nanocomposites was fabricated with different morphologies to serve as a photocatalytic material for the degradation of organic/inorganic dyes under visible light and the bactericidal effect against pathogenic bacteria. The GO-Cu2O was prepared with solid cube and hollow dodecahedra morphologies through in-situ synthesis, and characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman, Ultraviolet and visible spectrophotometry (UV/vis), and Fourier transform infrared spectroscopy. In comparison with cubic GO-Cu2O, the absorption and degradation efficiency of the GO-Cu2O dodecahedra (GCD) composite in Methyl orange (MO), Rhodamine B (RhB), and phenol was higher owning to the more active sites for the simultaneous dye and light absorption of hollow structure. The antibacterial effect of the GO-Cu2O dodecahedra was examined by the flat colony counting method with an excellent bactericidal effect against pathogenic bacteria. The possible mechanism for the preparation of GCD possessing the enhancement of the visible-light photocatalytic and antibacterial efficiencies were also investigated.

本研究制备了两种不同形貌的氧化石墨烯-氧化亚铜（graphene oxide-cuprous oxide, GO-Cu₂O）纳米复合材料，将其用作可见光下降解有机/无机染料的光催化材料，并考察其对病原菌的杀菌性能。本研究通过原位合成法制备了具有实心立方体形貌和空心十二面体形貌的GO-Cu₂O复合材料，并采用扫描电子显微镜（scanning electron microscopy, SEM）、透射电子显微镜（transmission electron microscope, TEM）、X射线衍射（X-ray diffraction, XRD）、拉曼光谱、紫外-可见分光光度法（ultraviolet and visible spectrophotometry, UV/vis）以及傅里叶变换红外光谱（Fourier transform infrared spectroscopy）对其进行了表征。与实心立方体形GO-Cu₂O相比，空心十二面体GO-Cu₂O（GO-Cu₂O dodecahedra, GCD）复合材料对甲基橙（Methyl orange, MO）、罗丹明B（Rhodamine B, RhB）及苯酚的吸附与降解效率更高，这是因为其空心结构拥有更多活性位点，可同时实现染料吸附与光吸收。本研究采用平板菌落计数法考察了GCD的抗菌性能，结果显示其对病原菌具有优异的杀菌效果。本研究同时探讨了GCD可见光光催化与抗菌性能提升的潜在作用机制。