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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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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 (Δ 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 (Δ H ) and entropy change (Δ S ) were obtained from the temperature effect experiments. For all acridinium derivatives, Δ H (from ?7.82 to ?26.0 kJ mol ~(?1) ) and Δ 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，研究了单阳离子吖啶衍生物对合成粘土矿物（SuPecton SA）的吸附行为。将吖啶衍生物吸附在粘土表面上而不会聚集，如吖啶衍生物的吸收光谱的变化，其中吖啶衍生物的吸收光谱和没有由吸附和非吸附成分的双组分平衡系统表示的SSA。在Langmuir等温分析之后，测定吸附平衡常数和最大吸附量，针对吖啶衍生物测定，并且计算出的Gibbs自由能量变化（δg），以α33.8至40.0kjmol〜（？1）的范围吸附均衡常数。这些结果表明，在粘土表面上吸附吖啶衍生物是一种出现的反应。此外，从温度效应实验中获得诸如焓变化（δH）和熵变（δS）的热力学参数。对于所有吖啶衍生物，δh（来自α7.82到α27.0kjmol〜（α1））和δs（0.047-0.088kj mol〜（Δ1）k〜（α1））是负的和阳性的， 分别。建议不仅静电相互作用，而且涉及范德华力和疏水性相互作用在粘土表面上的阳离子芳族分子的吸附中起重要作用。因为这些热力学参数表现出与吖啶鎓衍生物的分子横截面积强的相关性，所以建议疏水相互作用的贡献变小，因为分子横截面积变大。

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