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Thermodynamic study of the adsorption of acridinium derivatives on the clay surface

机译：吖啶衍生物对粘土表面吸附的热力学研究

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摘要

In this study, the adsorption behavior of mono-cationic acridinium derivatives on a synthetic clay mineral (Sumecton SA) was investigated. The acridinium derivatives were adsorbed on the clay surface without aggregation, as found from the changes in the absorption spectra of the acridinium derivatives with SSA and without SSA represented by two-component equilibrium systems of adsorbed and non-adsorbed components. Following the Langmuir isotherm analysis, the adsorption equilibrium constants and maximum adsorption amounts were determined for acridinium derivatives, and the Gibbs free energy change (Delta G) was calculated to be in the range of -33.8 to 40.0 kJ mol(-1)from the adsorption equilibrium constants. These results indicated that the adsorption of acridinium derivatives on the clay surface was an exergonic reaction. Moreover, thermodynamic parameters such as enthalpy change (Delta H) and entropy change (Delta S) were obtained from the temperature effect experiments. For all acridinium derivatives, Delta H(from -7.82 to -26.0 kJ mol(-1)) and Delta S(0.047-0.088 kJ mol(-1)K(-1)) were found to be negative and positive, respectively. It was suggested that not only electrostatic interactions, but also van der Waals forces and hydrophobic interactions played an important role in the adsorption of cationic aromatic molecules on the clay surface. Because these thermodynamic parameters showed a strong correlation with the molecular cross-sectional area of acridinium derivatives, it was suggested that the contribution of hydrophobic interactions became smaller as the molecular cross-sectional area became larger.
机译：在这项研究中，在合成粘土矿物（Sumecton SA）的单阳离子吖啶衍生物的吸附行为进行了研究。吖啶衍生物被吸附在粘土表面上的无聚集，如从与SSA和SSA不吖啶衍生物的吸收光谱的变化发现吸附和非吸附的组分的双组分平衡体系表示。以下Langmuir等温分析，吸附平衡常数和最大吸附量为吖啶衍生物被测定，并且吉布斯自由能变化（德尔塔G）从计算为在-33.8至40.0千焦耳摩尔（-1）吸附平衡常数。这些结果表明，吖啶衍生物的粘土表面上的吸附是一种放能反应。此外，从该温度效应实验中获得的热力学参数，如焓变（德尔塔H）和熵变（德尔塔S）。对于所有的吖啶衍生物，德尔塔H（从-7.82到-26.0千焦摩尔（-1））和Delta S（0.047-0.088摩尔千焦（-1）K（-1））被认为是分别阴性和阳性。有人建议，不仅静电相互作用，而且范德华力和疏水性相互作用在粘土表面上的阳离子的芳族分子的吸附发挥了重要作用。由于这些热力学参数显示出与吖啶鎓衍生物的分子横截面积的强相关性，有人建议，疏水性相互作用的贡献变小作为分子截面积变大。

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  • 来源
    《RSC Advances》 |2020年第36期|共9页
  • 作者

    Yoshida Yuma; Shimada Tetsuya; Ishida Tamao; Takagi Shinsuke;

  • 作者单位

    Tokyo Metropolitan Univ Grad Sch Urban Environm Sci Dept Appl Chem Environm 1-1 Minamiohsawa Hachioji Tokyo 19219397 Japan;

    Tokyo Metropolitan Univ Grad Sch Urban Environm Sci Dept Appl Chem Environm 1-1 Minamiohsawa Hachioji Tokyo 19219397 Japan;

    Tokyo Metropolitan Univ Grad Sch Urban Environm Sci Dept Appl Chem Environm 1-1 Minamiohsawa Hachioji Tokyo 19219397 Japan;

    Tokyo Metropolitan Univ Grad Sch Urban Environm Sci Dept Appl Chem Environm 1-1 Minamiohsawa Hachioji Tokyo 19219397 Japan;

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