Adsorption of sodium and lithium ions onto helicenes molecules: Experiments and phenomenological modeling
Adsorption of sodium and lithium ions onto helicenes molecules: Experiments and phenomenological modeling
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DOI：
10.1016/j.molliq.2019.110998
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发表时间：
2019-08-15
影响因子：
6
通讯作者：
Ben Lamine, Abdelmottaleb
中科院分区：
文献类型：
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作者：
Ben Yahia, Mohamed;Ben Yahia, Manel;Ben Lamine, Abdelmottaleb
从根本上说，吸附等温线可以提供合理的信息来解释吸附过程的机制。因此，通过使用石英晶体微天平（QCM）技术，在各种实验条件（温度、pH等）下收集了平衡数据，其中吸附量的变化表示氯化钠或氯化锂在七螺旋烯上的浓度。实验结果表明，当吸附层数有限时，吸附过程达到饱和。对于模型分析，先进的模型建立在光的统计物理处理描述的吸附过程进行了测试和讨论。根据实验结果，通过选择的模型参数，从理论上解释了吸附机理。有趣的是，注意到两种研究离子的每个位点值的键合离子数n（1）和n（2）是相似的。此外，该参数与温度的两个离子的线性趋势。这表明热搅拌对两种吸附离子具有相同的影响。吸附机理的能量参数表明，吸附的钠和锂的七螺旋烯的物理吸附的趋势，化学吸附过程。由于所采用的模型，三个经典的热力学函数已被计算和解释，以描述宏观热力学势的研究过程。(C)2019爱思唯尔B.V.保留所有权利。
Fundamentally, isotherm curves of adsorption can provide reasonable information to explain the mechanism of the adsorption process. Thus, equilibrium data in which the variation of adsorption quantity is expressed versus the concentration of Sodium chloride or Lithium chloride on hepta-Helicenes were collected under various experimental conditions (temperature, pH, etc) by using Quartz Crystal Microbalance (QCM) technique. The experimental results show that the adsorption process attains a saturation level when a limited number of layers was adsorbed. For modeling analysis, advanced models established in light of a statistical physics treatment describing the adsorption process have been tested and discussed in this paper. Based on the experimental results, the adsorption mechanism was interpreted theoretically via the chosen model parameters. It is interesting to note that the numbers n(1) and n(2) of bonded ions per site values of the two studied ions are similar. In addition, this parameter had a linear tendency with temperature for the two ions. This showed that the thermal agitation has the same effect on the two adsorbed ions. The adsorption mechanism was characterized by energetic parameters showing that the adsorption of Sodium and Lithium on Hepta-Helicenes was physisorption with a tendency toward a chemisorption process. Thanks to the adopted model, three classical thermodynamic functions have been calculated and interpreted to describe macroscopic thermodynamic potentials of the investigated process. (C) 2019 Elsevier B.V. All rights reserved.