摘要：石墨烯是由sp2杂化的碳原子构成的蜂窝状二维纳米材料，其独特的二维结构赋予石墨烯优异的热学、电学和光学性质，从而掀起了新一轮碳材料的研究热潮。银纳米粒子具优异的催化活性，在传感器、医学等领域具有潜在应用价值。本文以Hummers法制备的氧化石墨为原料，尿素为氮源，采用一步水热法制备掺氮石墨烯-Ag纳米复合材料。利用SEM、XRD分析等表征其微观结构和形貌。以制备的掺氮石墨烯-Ag纳米复合材料为催化剂，探讨其对硝基苯胺的催化性能。结果显示，掺氮石墨烯-Ag纳米复合材料对硝基苯胺与硼氢化钠的反应有很好的催化效果，酸性或碱性环境都能加快反应进度，反应在30min，转化率高达96%。91400

毕业论文关键词：掺氮石墨烯，Ag纳米粒子，复合材料，催化还原，硝基苯胺

Abstract：Graphene is a kind of two-dimensional nanomaterial with honeycomb crystal structure composed by sp2 hybridized carbon atoms。 Due to its unique structure graphene shows excellent thermal, electrical and optical properties。 Thus carbon nanomaterials have attracted more and more attention in recent years。 Silver nanoparticles with great catalytic activities have great potential applications in the field of sensors and medicine。 In this paper, using graphite oxide prepared by Hummers method as raw material and urea as nitrogen source, nitrogen doped graphene-Ag nanocomposites were synthesized by hydrothermal method。 The morphology of nitrogen doped graphene-Ag nanocomposites were characterized by SEM and XRD。 The as-prepared nitrogen doped graphene-Ag nanocomposites were used as catalyst to investigate catalytic performance toward the reduction of p-nitroaniline。 The results show that the addition of nitrogen doped graphene-Ag nanocomposites in the reacting system can accelerate the reaction rate, moreover, both acidic environment and alkaline environment can further fasten the reducing reaction rate。 The reducing efficiency is over 96% in 30 mintues。 As a result, nitrogen doped graphene-Ag nanocomposites have a good catalytic activity to the reduction of p-nitroaniline。源G于J优L尔V论N文M网WwW.youeRw.com 原文+QQ75201`8766

Keywords: nitrogen doped graphene, Ag nanoparticles, Nanocomposites, catalytic reduction, nitroaniline

目  录

1  前言 3

1。1  石墨烯发现过程 3

1。2  石墨烯的结构和性能 3

1。3  氧化石墨烯概述及制备方法 3

1。4  氧化石墨烯的应用 4

1。5  银纳米材料简介 4

1。6  银纳米材料的合成进展 4

2  实验部分 5

2。1  实验仪器和试剂 5

2。1。1  仪器 5

2。1。2  试剂 5

2。2  实验步骤 5

2。2。1  制备氧化石墨烯GO(Hummers法) 5

2。2。1。1  透析袋的处理 5

2。2。1。2  制备氧化石墨 6

2。2。1。3  制备氧化石墨烯 6

2。2。2  制备掺氮石墨烯-Ag纳米复合材料 6

2。2。2。1  反应釜预处理 6

2。2。2。2  制备掺氮石墨烯-Ag纳米复合材料