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碳纳米管具有中空层状结构,大的比表面积和长径比,高的化学稳定性和热稳定性以及端帽、内腔、管壁容易被修饰等特点,是一种较为理想的吸附材料。综述了碳纳米管与吸附相关的结构和性质,分析了经硝酸氧化处理过的碳纳米管对溶液中金属离子的吸附作用原理,以及pH值、离子浓度对吸附作用的影响。讨论了将碳纳米管对金属离子的吸附作用与分离富集技术相联系,应用于元素分析测定,能够提高方法灵敏度,降低了元素检出限。在仪器分析方面将有巨大潜力。
Carbon nanotubes with a hollow layer structure, large specific surface area and aspect ratio, high chemical stability and thermal stability and end cap, cavity, wall easily modified, etc., is an ideal adsorbent material . The structure and properties of carbon nanotubes (CNTs) adsorbed on carbon nanotubes were reviewed. The principle of adsorbing metal ions by nitric acid oxidation and the effect of pH value and ion concentration on the adsorption were analyzed. It is discussed that the adsorption of metal ions by the carbon nanotubes is related to the separation and enrichment technique, and the method is applied to the elemental analysis and determination to increase the sensitivity of the method and reduce the detection limit of the element. There will be great potential in instrumental analysis.