Characterisation of sorption processes of organic cations on selected oxidic surfaces

全面了解有机化合物在固相材料表面上的键合机制对于描述其在自然（例如含水层）或技术（水处理过程中的吸附过程）系统中的吸附行为至关重要。到目前为止，缺乏关于有机阳离子对天然沉积物的相当大的阻滞作用的知识，这已经被不同的作者以及作者自己的调查所证实。在拟议的项目中，应使用系统的实验室实验深入研究有机阳离子与固相材料表面之间的相互作用过程。在自然系统中，相互作用过程非常复杂，并且同时发生。对于这些机制的单独和集中的调查，合成氧化材料作为吸附剂将被应用在尽可能定义和均匀的方式。通过选择性使用不同的氧化吸附剂和无机阳离子Ca 2+和Na+的竞争影响的变化，应得出关于离子和其他相互作用的贡献的结论。为此目的，实验室批量实验设想估计等温线和由此产生的吸附参数在各种边界条件下。此外，应使用不同的方法表征表面性质（例如电荷、表面基团），以评估其对吸附过程的影响。

A comprehensive understanding of the bonding mechanisms of organic compounds on the surfaces of solid phase materials is essential for the description of their sorption behaviour in natural (e.g. aquifers) or technical (adsorption processes during water treatment) systems. Up to now there is a lack of knowledge in regard to the considerable retardation of organic cations on natural sediments already proven by different authors as well as the authors own investigations. Within the proposed project the interaction processes between organic cations and surfaces of solid phase materials shall be intensively studied using systematic laboratory experiments. In natural systems the interaction processes are very complex and occur simultaneously. For the separate and focused investigation of these mechanisms, synthetic oxidic materials as sorbents will be applied in as defined and homogeneous a way as possible. By the selective use of different oxidic sorbent and a changing competition influence of the inorganic cations Ca2+ and Na+, conclusions shall be drawn about the contribution of ionic and other interactions. For this purpose, laboratory batch experiments are envisioned to estimate isotherms and the resulting sorption parameters under various boundary conditions. Furthermore, the surface properties (e.g. charge, surface groups) shall be characterized using different methods to assess their influence on the sorption processes.