摘 要：石墨烯是一种由碳原子构成的单层片状结构新材料，由于石墨烯材料的特殊结构和性能使其在各个领域得到广泛的应用。本论文以改进的Hummers方法制备的氧化态石墨为起始原料，采用水热法一步制备掺氮石墨烯-CuS纳米复合材料，通过优化温度、时间、原料比例及种类、pH值等，实现复合材料的可控合成，运用XRD、SEM等对制备的复合材料进行表征，确定了复合材料的组成和微观结构。在此基础上，以制备的复合材料为光催化剂，研究其在紫外光作用下，对亚甲基蓝的光催化降解性能，结果表明，该复合材料对有机染料具有较好的光催化降解能力，有望用于实际的污水处理过程，研究为拓展石墨烯复合材料的应用奠定基础。79682

毕业论文关键词：掺氮石墨烯-CuS复合材料，水热法，亚甲基蓝，光催化

Abstract： As a new kind of two-dimensional material, graphene is composed of sp2-bonded carbon atoms that are densely packed into a honeycomb crystal lattice。 Due to its unique structure and properties, graphene has been widely used in various fields。 In this paper, nitrogen-doped graphehe-CuS nanocomposite was prepared by one-step hydrothermal method using graphite oxide synthesized by modified Hummers method as raw material。 The effect of time, termperature, and pH value and the ratio of raw materials to size and morphology of nanocomposite were studied in detail。 Scanning election microscopy(SEM) and X-ray diffraction(XRD) were developed to comfirm the composition and microstructure of the composite。 Using the composite as photo-catalysis, methylene blue as model molecule was degraded under the radiation of UV light。 The results show that nitrogen-doped graphehe-CuS nanocomposite has excellent performance to degradation of organic dyes and is expected to apply in the treatment of polluted water。 So the researches lay the foundation of practical application of graphene-based nanocomposite。

Keywords: Nitrogen doped graphene-CuS composite, Hydrothermal method, Methylene blue, Photocatalysis, 

目    录

1。 前言 3

1。1石墨烯 3

1。1。1 石墨烯的结构与性质 3

1。1。2 石墨烯的制备 3

1。1。3 石墨烯的表征 5

1。1。4 石墨烯的应用 6

   1。2光催化 7

1。2。1 光催化原理与材料 7

2。 实验部分 8

   2。1 实验器材 8

   2。2 实验试剂 8

   2。3 制备氧化石墨 8

      2。3。1石墨的预氧化 8

      2。3。2 Hummers'方法氧化 8

      2。3。3氧化石墨的剥离 8

   2。4 合成掺氮石墨烯-CuS复合材料 9

   2。5 掺氮石墨烯-CuS对亚甲基蓝光降解速率影响 9

3。 结果与讨论 10

   3。1 石墨烯的制备方法 10

   3。2掺氮石墨烯-CuS材料的XRD表征 10

   3。3掺氮石墨烯-CuS材料的SEM表征