In this work, a novel Pt/ZnO composite: Pt quantum dots decorated nest-like 3D porous ZnO nanostructures has been prepared via a simple and effective method. The effect of loading Pt quantum dots on photocatalytic properties of ZnO nanostructures is investigated by using SEM, TEM, EDX, XPS, PL, UV–Vis DRS, and BET studies. The results show that nest-like 3D porous ZnO nanostructures can be rapidly synthesized at 80 ℃ for 30 min under microwave heating. Subsequently, the metallic Pt quantum dots are successfully supported and uniformly distributed on the nest-like ZnO nanostructures by photochemical method to form the Pt/ZnO composite. The loading of Pt quantum dots on the nest-like 3D porous ZnO nanostructures intensively increases the visible light absorption resulting in about 4 times higher current response to the visible light, together with the BET surface area enhancement by 75%, than that of the pure ZnO. As a result, Pt/ZnO composite exhibits high catalytic stability and photocatalytic activity towards the degradation of Rhodamine B. In addition, the enhanced photocatalytic activity of Pt/ZnO is attributed to the Pt quantum dots acting as excellent photosensitizer and transporter of photogenerated electrons under visible light, which can retard the recombination of electrons and holes.

在这项工作中，通过一种简单有效的方法，制备了一种新型的Pt / ZnO复合材料：装饰有巢状3D多孔ZnO纳米结构的Pt量子点。通过使用SEM，TEM，EDX，XPS，PL，UV-Vis DRS和BET研究，研究了负载Pt量子点对ZnO纳米结构光催化性能的影响。结果表明，在微波加热下，于80℃加热30 min可以快速合成巢状3D多孔ZnO纳米结构。随后，通过光化学方法成功地将金属Pt量子点支撑并均匀分布在巢状ZnO纳米结构上，从而形成Pt / ZnO复合材料。Pt量子点在巢状3D多孔ZnO纳米结构上的负载会极大地增加可见光吸收，从而导致对可见光的电流响应提高约4倍，与纯ZnO相比，BET表面积增加了75％。结果，Pt / ZnO复合材料对罗丹明B的降解表现出高的催化稳定性和光催化活性。此外，Pt / ZnO的增强的光催化活性归因于Pt量子点在光强下可作为光敏电子的优良光敏剂和转运体可见光，可以阻止电子和空穴的复合。