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的键合机制对于描述它们在自然（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，关于有机阳离子对天然沉积物的阻滞作用，不同作者和作者自己的研究已经证明了这一点，但还缺乏认识。在提议的项目中，有机阳离子与固相材料表面之间的相互作用过程应通过系统的实验室实验进行深入研究。在自然系统中，相互作用过程非常复杂，而且是同时发生的。为了对这些机制进行单独和集中的研究，合成氧化材料作为吸附剂将以尽可能明确和均匀的方式应用。通过对不同氧化吸附剂的选择性使用以及无机阳离子Ca2+和Na+竞争影响的变化，可以得出离子和其他相互作用的贡献。为此，设想通过实验室批量实验来估计各种边界条件下的等温线和所得吸附参数。此外，表面性质（如电荷、表面基团）应使用不同的方法进行表征，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.