膨胀石墨的制备及表面修饰+文献综述
关键词： 膨胀石墨；酸比；膨化时间；体积密度
Preparation of expanded graphite and surface modification
Abstract: Expanded graphite is a very widely used carbon materials for its own low density, large surface area, resistance to oxidation, high temperature, acid and alkali resistance and other characteristics, its scope of application involves adsorption, catalysis, electronics, aviation and other fields. Expanded Graphite wide range of applications determine how people will continue to study its preparation for a special performance to meet the needs of a particular field of use. This chemical oxidation using - concentrated sulfuric acid and concentrated nitric acid to prepare the expanded graphite, graphite and compared loading, puffing time, acid ratio of size, whether extruded graphite ultrasound effect, characterized by the bulk density. The results show that flake graphite expanded graphite optimal synthesis processes: Graphite: concentrated sulfuric acid: concentrated nitric acid = 1:2:1, the reaction time of the ultrasonic condition 8h , place 50 ℃drying oven dried, and finally in a muffle furnace temperature of 750 ℃ expanding treatment, to get better expansion of the expanded graphite.
Key Words: Expanded graphite；Acid ratio；Expanded time ；Volume density
目 录
1 前言 1
1.1 开题依据 1
1.1.1 膨胀石墨概述 1
1.1.2 膨胀石墨形成机理 1
1.1.3 膨胀石墨结构和特性 2
1.1.4 膨胀石墨的用途 3
1.2 文献综述 7
1.2.1 化学氧化法 7
1.2.2 电化学氧化法 8
1.2.3 超声氧化法 8
1.2.4 气相扩散法 9
1.3 本课题研究内容及意义 9
1.3.1 本课题的研究内容 9
1.5.2 本课题的研究意义 9
2 实验部分 11
2.1实验试剂 11
2.2实验设备 11
2.3实验方法 11
2.3.1膨胀石墨的制备方法 11
2.3.2膨胀石墨的制备条件探讨 12
3 结果与讨论 13
3.1 不同负载量下的实验结果 13
3.2 不同膨胀时间下的实验结果 13
3.3 不同酸比下的实验结果 14
3.4 超声下的实验结果 15
4 结论 17
致谢 18
参考文献 19
膨胀石墨的制备及表面修饰
1 前言
1.1开题依据
1.1.1 膨胀石墨概述
碳是自然界最普遍的元素之一，碳化合物的成键方式和结构形式极其丰富，膨胀石墨便是其中一种新型碳素材料。早在19世纪60年代初，Brodie将天然石墨与硫酸和硝酸等化学试剂作用后加热，发现了膨胀石墨，然而其应用则在百年之后才开始[1]。从此，众多国家就相继展开了膨胀石墨的研究和开发，取得了重大的科研突破。
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