Herein, adsorption isotherms of Pb(II) and Cu(II) ions on treated sea mango fruit in both single-compound and binary systems were experimentally realized at different temperatures in the range of 30–50 °C. Experimental results show that adsorption of Pb(II) was more as compared to that of Cu(II) ions; however, for both ions, a significant reduction in the adsorption capacity was observed in the binary system as compared to that in the single-compound systems. Moreover, under all the investigated conditions, adsorption seems to be promoted by an increase in temperature. To understand and interpret the experimental evidences, the Hill and competitive Hill models developed on the basis of the grand canonical ensemble were applied for the analysis of adsorption equilibrium data. These models contain some physicochemical parameters that allow an exhaustive analysis of the dynamics of single-compound and binary adsorptions. Based on the fitting results, in particular, through the evaluation of the number of ions bonded per site (n and n_i), it was found that lead and copper ions interacted by inclined and horizontal positions on treated sea mango in single-compound and binary systems, respectively. In addition, based on the same parameters, a significant interaction between ions was retrieved. A study focused on the saturation adsorption capacity in single-compound and binary systems affirmed that the adsorbent was more selective for lead than for copper. The reduction of the adsorbed capacity ratio between the binary and single-compound systems (i.e. Q_b/Q_s) explained and confirmed that an inhibition effect between copper and lead ions at the same receptor site occurred. Finally, based on the energetic investigations, it was deduced that the adsorption energy represented the dominant factor promoting the greater adsorption of lead than that of copper in both systems.

中文翻译：

---

处理过的芒果壳上铜和铅离子的单化合物和二元吸附的新见解：实验和理论研究

在这里，在30–50°C的不同温度下，通过实验实现了单化合物和二元系统中处理过的芒果果实上Pb（II）和Cu（II）离子的吸附等温线。实验结果表明，铅（的吸附II）为更相比于铜（II）离子; 然而，对于两种离子，在二元体系中均观察到与单化合物体系相比吸附能力显着降低。而且，在所有研究的条件下，温度升高似乎促进了吸附。为了理解和解释实验证据，将基于大正则集合开发的Hill和竞争Hill模型应用于吸附平衡数据的分析。这些模型包含一些理化参数，可以详尽地分析单化合物和二元吸附的动力学。根据拟合结果，尤其是通过评估每个位点结合的离子数（n和n _i），发现在单一化合物和二元体系中，铅和铜离子分别通过处理过的芒果上的倾斜和水平位置相互作用。此外，基于相同的参数，可以检索到离子之间的显着相互作用。一项针对单一化合物和二元系统的饱和吸附容量的研究证实，吸附剂对铅的选择性高于对铜的选择性。二元和单化合物系统之间的吸附容量比的降低（即Q _b / Q _s）解释并确认在相同的受体位点发生了铜和铅离子之间的抑制作用。最后，基于能量研究，推论出在两种体系中，吸附能都是促进铅比铜吸附更大的主要因素。