二氧化铈/石墨纳米复合光催化剂的制备及其乙醛气体降解性能研究

Fabrication of CeO2-Graphite nanocomposited photocatalyst and study of degrading CH3CHO gas

在很多研究中将石墨(简称GR)当做一种非常普遍的添加剂,因为石墨成本低廉而且导电性非常好,所以制备以石墨为基材的化合物并将之应用于诸多领域已经获得了许多研究者的关注。在本文的研究中,提出了一种通过原位溶剂热生长法在石墨表面负载CeO2纳米颗粒来制备复合光催化材料的方法,并通过X射线衍射、拉曼光谱学、扫描电镜、及紫外-可见光谱法对所制备的CeO2-GR复合光催化材料进行了形貌分析和结构表征。研究表明:应用本文提出的原位溶剂热生长法,可以制备出CeO2纳米颗粒尺寸控制良好并在石墨基片上分布均匀且密度可调的复合材料。最后,本文通过开展可见光照射条件下降解乙醛气体的实验对CeO2-GR复合材料的光催化能力进行了评估,结果表明CeO2-GR50样品的CO2产量比CeO2-GR0(未添加石墨)样品提高了2.2倍,并提出了可能的催化机理。

Graphite,denoted as GR,is a common additive in tremendous papers.Attributing to its low cost and excellent electrical conductibility,GR has attracted much attention in the preparation of graphite-based composites for various applications.In this study,in situ solvethermal growth approach has been developed to load CeO2 nanoparticles onto GR surface.The microstructure and morphology of the as-synthesized CeO2-GR hybrid photocatalysts were investigated by X-ray diffraction(XRD),Raman spectroscopy,Scanning electron microscopy(SEM)and Ultraviolet visible spectrum(UV-Vis).The results reveal that CeO2 nanoparticles with well-controlled size and a uniform distribution on GR sheets with tunable density can be achieved through the in-situ approach.The photocatalytic activity of the CeO2-GR hybrid was also evaluated by degrading CH3CHO gas under visible light irradiation.The result shows that the CeO2 evolution of CeO2-GR50 sample with 24 h visible light irradiation is 2.2 times higher than that of CeO2-GR0 counterpart.At last,the schematic diagram of possible photocatalytic mechanism for CeO2-GR was proposed.