The adsorption of Pb(II) and Hg(II) ions on bentonite-alginate composite (BAC) is investigated in both single-compound and binary systems, at three different temperatures. For a better interpretation and comparison, all the adsorption equilibrium isotherms are recorded under identical conditions. A simple examination of all adsorption equilibrium isotherms shows that the bentonite-alginate composite is more effective for Pb (II) adsorption than for Hg (II) and the adsorption capacity is reduced in binary system, reflecting a competitive effect between the Pb (II) and Hg (II). To explain the single and binary processes and the corresponding mechanisms, Hill and competitive Hill models are applied. The adsorption geometry can be determined at different temperatures by an estimation of the number of ions captured per BAC adsorbent site. Based on these models, it is shown that the affinity sequence in all adsorption systems is: Pb (II) - Hg (II). This behavior can be explained and corroborated by an energetic analysis deduced from these models. Finally, in order to deepen the interpretation of single-compound and binary adsorption, the conductor-like screening model (COSMO-RS) was tested and applied to calculate the total interaction energies between heavy metals and BAC adsorbent. The evaluation of energies deduced from COSMO-RS model indicated that the electrostatic misfit interaction energy may play the main role in the heavy metals ions adsorption in tested systems.

在三种温度下，在单化合物和二元体系中研究了膨润土-藻酸盐复合材料（BAC）上Pb（II）和Hg（II）离子的吸附。为了更好地解释和比较，在相同条件下记录了所有吸附平衡等温线。对所有吸附平衡等温线的简单检查表明，膨润土-海藻酸盐复合物对Pb（II）的吸附比对Hg（II）的吸附更有效，二元体系中的吸附能力降低，反映了Pb（II）之间的竞争效应和汞（II）。为了解释单一过程和二元过程以及相应的机制，应用了希尔模型和竞争性希尔模型。可以通过估计每个BAC吸附位点捕获的离子数来确定不同温度下的吸附几何形状。根据这些模型，表明所有吸附系统中的亲和力顺序为：Pb（II）-Hg（II）。从这些模型得出的能量分析可以解释和证实这种行为。最后，为了加深对单化合物和二元吸附的解释，测试了类似导体的筛选模型（COSMO-RS），并将其应用于计算重金属与BAC吸附剂之间的总相互作用能。从COSMO-RS模型推导的能量评估表明，静电失配相互作用能可能在测试系统中的重金属离子吸附中起主要作用。为了加深对单一化合物和二元吸附的解释，测试了类似导体的筛选模型（COSMO-RS），并将其应用于计算重金属与BAC吸附剂之间的总相互作用能。从COSMO-RS模型推导的能量评估表明，静电失配相互作用能可能在测试系统中的重金属离子吸附中起主要作用。为了加深对单一化合物和二元吸附的解释，测试了类似导体的筛选模型（COSMO-RS），并将其应用于计算重金属与BAC吸附剂之间的总相互作用能。从COSMO-RS模型推导的能量评估表明，静电失配相互作用能可能在测试系统中的重金属离子吸附中起主要作用。