【作者】 张娜；

【导师】 于升学；

【作者基本信息】 燕山大学 ， 化学工程与技术， 2018， 硕士

【摘要】 氧化亚铜（Cu₂O）作为一种P型半导体,能带带隙约为2.17 eV,能充分利用可见光区域,无毒,制备简单,属于一种理想的光催化材料;石墨烯作为一种二维材料,因其优异的电学光学性质被广泛研究;石墨相氮化碳（g-C₃N₄）作为一种新型的材料,具有良好的半导体性能和化学稳定性。通过将还原氧化石墨烯（RGO）和石墨相氮化碳（g-C₃N₄）与氧化亚铜（Cu₂O）复合,能有效提供材料的光催化性能。本文采用水热法制备出了不同形貌的氧化亚铜材料,不同含量的Cu₂O/RGO以及Cu₂O/g-C₃N₄复合材料。利用X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）对材料的形貌结构进行了表征分析;采用紫外可见分光光度计（UV）、荧光光谱（PL）分析材料的光学性能;通过降解甲基橙溶液的程度来比较不同催化剂的光催化性能。研究表明,添加不同量的表面活性剂能够改变Cu₂O的形貌,实验中分别制备出了立方体、十四面体、八面体以及类球形Cu₂O材料,类球形Cu₂O因其较大的比表面积和较小的粒子尺寸表现出较强的光催化性能,光降解效率达到了68.88%。Cu₂O/RGO复合材料加入RGO之后,Cu₂O形貌仍为类球形,分散于还原氧化石墨烯薄层上,复合材料光催化性能得到了提高,当RGO的复合量为0.03 g时,降解率达到了89.90%,同时复合材料的稳定性也得到了提高。通过将g-C₃N₄与Cu₂O复合,材料表现出优异的光催化性能,并且稳定性也有所提高。经过12 h离心后,g-C₃N₄呈现出片层结构,Cu₂O颗粒分散其片层结构上。当g-C₃N₄的含量为0.5 g时,光降解率能够达到95.70%。更多还原

【Abstract】 Cuprous oxide（Cu₂O）is a p-type semiconductor with a band gap of about 2.17 eV.It can make full use of visible light,simple operation and non-toxic.It belongs to an ideal photocatalytic material and has attracted much attention from researchers.As a two-dimensional material,graphene has been widely concerned because of its excellent electrical and optical properties.Graphitic carbon nitride（g-C₃N₄）,as a new type of material,has good semiconductor properties and chemical stability.By combination the reduced graphene oxide and Graphitic carbon nitride with cuprous oxide,the photocatalytic properties of the materials can be effectively enhanced.In this study,different morphologies of cuprous oxide,Cu₂O/RGO and Cu₂O/g-C₃N₄ composites have been prepared by hydrothermal method.X ray diffraction（XRD）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）were used to characterize the composition and morphologies of the samples;The optical properties were analyzed by UV-Visible spectroscope and fluorescence spectrum;By comparising different catalysts,the properties of photogradation of methyl orange solution were discussed.Research shows that the morphologies of cube,14-facet polyhedral,octahedral and sphere of Cu₂O powder were synthesized by adding different amounts of surfactants.The spherical Cu₂O makes better photocatalytic performance due to its large surface area and smaller particle size,the degradation rate reached 68.88%.The photocatalytic properties of Cu₂O/RGO composites were improved by adding RGO.The photos show that Cu₂O had dispersed in the reduction of graphene oxide thin film.When the composite content of RGO was 0.03 g,the degradation rate reached89.90%,and the stability of composites were also improved.Cu₂O/g-C₃N₄ composite shows excellent photocatalytic performance and the stability is also improved.After 12 hours centrifugation,g-C₃N₄ showed lamellar structure and Cu₂O particles dispersed on the structure.When the g-C₃N₄ content is 0.5 g,the degradation rate can reach 95.70%.更多还原