Schwaminger Sebastian P, Brammen Markus W, Zunhammer Florian, Däumler Nicklas, Fraga-García Paula, Berensmeier Sonja
Bioseparation Engineering Group, Department of Mechanical Engineering, Technical University of Munich, Boltzmannstraße 15, 85748, Garching, Germany.
Nanoscale Res Lett. 2021 Feb 10;16(1):30. doi: 10.1186/s11671-021-03491-5.
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前沿。此外，它们在色谱中作为固定相的作用正变得越来越重要。我们研究了一种由多壁碳纳米管（CNT）和超顺磁性氧化铁纳米颗粒组成的材料，以探讨其作为混合模式色谱材料的用途。其思路是将离子交换材料氧化铁固定在碳纳米管上，作为色谱过程的稳定基质，且压力降不大。合成了氧化铁纳米颗粒，并通过共沉淀途径用于修饰碳纳米管。它们与氧化的碳纳米管壁结合，从而能够对复合材料进行磁分离。用透射电子显微镜、磁强计、X射线衍射、X射线光电子能谱和拉曼光谱对这种复合材料进行了研究。此外，我们还测定了其比表面积和润湿性。我们还展示了其作为氨基酸保留色谱材料的适用性，描述了在被水介质包围的复杂多孔系统中不同氨基酸的吸附和解吸情况。因此，由于氧化铁纳米颗粒，这种材料既可以用作色谱基质，也可以用作磁性批量吸附材料。我们的工作为当前复合材料的研究做出了贡献。此类材料对于开发新型工业应用或提高现有工艺的性能是必不可少的。
