Carbon-based materials are the spearhead of research in multiple fields of nanotechnology. Moreover, their role as stationary phase in chromatography is gaining relevance. We investigate a material consisting of multiwall carbon nanotubes (CNTs) and superparamagnetic iron oxide nanoparticles towards its use as a mixed-mode chromatography material. The idea is to immobilize the ion exchange material iron oxide on CNTs as a stable matrix for chromatography processes without a significant pressure drop. Iron oxide nanoparticles are synthesized and used to decorate the CNTs via a co-precipitation route. They bind to the walls of oxidized CNTs, thereby enabling to magnetically separate the composite material. This hybrid material is investigated with transmission electron microscopy, magnetometry, X-ray diffraction, X-ray photoelectron and Raman spectroscopy. Moreover, we determine its specific surface area and its wetting behavior. We also demonstrate its applicability as chromatography material for amino acid retention, describing the adsorption and desorption of different amino acids in a complex porous system surrounded by aqueous media. Thus, this material can be used as chromatographic matrix and as a magnetic batch adsorbent material due to the iron oxide nanoparticles. Our work contributes to current research on composite materials. Such materials are necessary for developing novel industrial applications or improving the performance of established processes.

碳基材料是纳米技术多个领域研究的先锋。此外，它们在色谱中作为固定相的作用越来越重要。我们研究由多壁碳纳米管（CNTs）和超顺磁性氧化铁纳米粒子组成的材料，以用作混合模式色谱材料。想法是将离子交换材料氧化铁固定在CNT上，作为色谱过程的稳定基质，而不会出现明显的压降。合成了氧化铁纳米颗粒，并用于通过共沉淀途径装饰CNT。它们结合到氧化的CNT的壁上，从而能够磁性分离复合材料。通过透射电子显微镜，磁力计，X射线衍射对这种杂化材料进行了研究，X射线光电子和拉曼光谱。此外，我们确定其比表面积及其润湿行为。我们还证明了其作为氨基酸保留色谱材料的适用性，描述了被水性介质包围的复杂多孔系统中不同氨基酸的吸附和解吸。因此，由于氧化铁纳米颗粒，该材料可用作色谱基质和磁性批吸附材料。我们的工作为当前对复合材料的研究做出了贡献。这样的材料对于开发新颖的工业应用或改善已建立过程的性能是必需的。描述了在水介质包围的复杂多孔系统中不同氨基酸的吸附和解吸。因此，由于氧化铁纳米颗粒，该材料可用作色谱基质和磁性批吸附材料。我们的工作为当前对复合材料的研究做出了贡献。这样的材料对于开发新颖的工业应用或改善已建立过程的性能是必需的。描述了在水介质包围的复杂多孔系统中不同氨基酸的吸附和解吸。因此，由于氧化铁纳米颗粒，该材料可用作色谱基质和磁性批吸附材料。我们的工作为当前对复合材料的研究做出了贡献。这样的材料对于开发新颖的工业应用或改善已建立过程的性能是必需的。