Abstract The understanding of the mechanism of co-operative adsorption of Co(II) cations and acetate or citrate anions onto γ-Al2O3 from aqueous solutions has been refined on the basis of comparison between the enthalpies of displacement measured in single-solute and bi-solute systems by means of isothermal titration calorimetry. The data processing procedures were adapted to take into account the occurrence of a cobalt-ligand complex in the bulk solution. Considering the bridging role of the adsorbed cobalt cations as a starting point to reproduce the enthalpy of displacement in the cobalt-acetate system, each ligand unit was suggested to bind preferentially to more than one adsorbed metal species and to interact additionally with some electrically neutral binding sites on the oxide surface. In the case of cobalt-citrate couple, the formation of a 1:1 stoichiometry solid-ligand-metal complex and simultaneous adsorption of cobalt cations as bidentate inner-sphere complexes reproduced best the experimental data.

中文翻译：

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在水溶液中存在共络合阴离子的情况下，γ-氧化铝表面吸附 Co(II) 的协同效应的量热筛选

摘要 通过比较单溶质和双溶质中测得的置换焓，加深了对 Co(II) 阳离子和乙酸根或柠檬酸根阴离子从水溶液中协同吸附到 γ-Al2O3 上的机理的理解。通过等温滴定量热法测定溶质系统。数据处理程序经过调整以考虑到大量溶液中钴-配体复合物的出现。考虑到吸附的钴阳离子的桥接作用作为重现钴-乙酸盐体系中置换焓的起点，建议每个配体单元优先结合一种以上的吸附金属物质，并额外与一些电中性结合相互作用氧化物表面的位置。在钴-柠檬酸对的情况下，