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Characterization of sorption of non-ionic organic compounds on carbon-based nanomaterials

碳基纳米材料对非离子有机化合物的吸附表征

基本信息

批准号：
215412159
负责人：
Professor Dr. Torsten Schmidt
金额：
--
依托单位：
Standort Hermsdorf
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/215412159?language=en
关键词：
Characterization sorption non ionic organic

项目摘要

The interaction between carbon nanomaterials (CNM) and organic or inorganic compounds is studied by many scientists, because of the strong sorption of CNM. Although already many studies have been conducted with different compounds and materials in batch experiments, a general understanding of the underlying sorption mechanisms was missing. The results of the first project phase helped to improve the knowledge in this field concerning carbon nanotubes. Different models were developed, which give information about the relevant sorption mechanisms, but they are only valid for certain environmental conditions (pH, ionic strength, temperature) and are not transferable to other conditions. The influence of environmental conditions on sorption was studied in literature only for a limited number of compounds and materials with the consequence that even here a general understanding of the underlying processes is still missing. The batch experiments used in literature and the first project phase had disadvantages, namely the long equilibration time and limited amount of sorbent and hence the variation in environmental conditions and material characteristics was limited. In the proposed follow-up project to the mechanistic investigations concerning sorption should be continued and the focus is shifted on the variability of sorption to different types of CNM and on the effect of different environmental conditions on sorption. For this purpose, a column-based method shall be developed, that is able to substitute the classical batch approach and thus to enable the faster variation of environmental conditions with less time-consuming work. First, it is investigated with validated columns how comparable results to batch experiments can be obtained. After establishment of this method, various sorbates are used as chemical probes to characterize the different sorbents. Sorption experiments will be performed at different environmental conditions to investigate the influence of these parameters on sorption. The results of these measurements are implemented in existing models or used to develop new models, which enable the prediction of sorption of organic compounds to CNM for different environmental conditions. Based on an improved process understanding, columns packed with CNM will be exemplary applied for separations in the field of analytical chemistry in comparison with a classical C18-phase.

由于碳纳米材料具有很强的吸附性，因此碳纳米材料与有机或无机化合物之间的相互作用受到了许多科学家的关注。虽然已经进行了许多研究与不同的化合物和材料在批量实验中，基本的吸附机制的一般理解是缺失的。项目第一阶段的成果有助于提高该领域有关碳纳米管的知识。开发了不同的模型，这些模型提供了有关吸附机制的信息，但它们仅对某些环境条件（pH值、离子强度、温度）有效，不能转移到其他条件。文献中仅对有限数量的化合物和材料研究了环境条件对吸附的影响，结果是，即使在这里，仍然缺少对基本过程的一般理解。文献和第一个项目阶段中使用的分批实验存在缺点，即平衡时间长和吸附剂量有限，因此环境条件和材料特性的变化有限。在拟议的后续项目中，应继续开展有关吸附的机理研究，并将重点转移到不同类型的氯化萘吸附的可变性以及不同环境条件对吸附的影响上。为此，应开发一种基于色谱柱的方法，该方法能够替代经典的批处理方法，从而能够以更少的耗时工作更快地改变环境条件。首先，它是研究与验证的列如何可比的结果，批实验可以获得。在建立该方法后，使用各种吸附剂作为化学探针来表征不同的吸附剂。将在不同的环境条件下进行吸附实验，以研究这些参数对吸附的影响。这些测量的结果在现有的模型中实施或用于开发新的模型，这使得能够预测不同环境条件下有机化合物对CNM的吸附。基于改进的过程理解，与经典的C18相相比，填充有CNM的柱将被示例性地应用于分析化学领域中的分离。