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Surface Characterization of Sepiolite by Inverse Gas Chromatography

机译:海泡石的反相气相色谱表征

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Inverse gas chromatography (IGC) was applied to characterize the surface of sepiolite. The adsorption thermodynamic parameters (the standard enthalpy (ΔH 0), entropy (ΔS 0) and free energy of adsorption (ΔG 0)), the dispersive component of the surface energy (γ S d ), and the acid/base character of sepiolite surface were estimated by using the retention time of different non-polar and polar probes at infinite dilution region. The specific free energy of adsorption (ΔG sp ), the specific enthalpy of adsorption (ΔH sp ), and the specific entropy of adsorption (ΔS sp ) of polar probes on sepiolite were determined. ΔH sp were correlated with the donor and modified acceptor numbers of the probes to quantify the acidic K A and the basic K D parameters of the sepiolite surface. The values obtained for the parameters K A and K D indicated an acidic character for sepiolite surface.
机译:应用反相气相色谱(IGC)表征海泡石的表面。吸附热力学参数(标准焓(ΔH0 ),熵(ΔS0 )和吸附自由能(ΔG0 ),表面能的分散成分(γ) S d ),并使用不同的非极性和极性探针在无限稀释区域的保留时间估算海泡石表面的酸/碱特性。确定了海泡石上极性探针的吸附比自由能(ΔGsp ),吸附比焓(ΔHsp )和吸附比熵(ΔSsp )。 。 ΔHsp 与探针的供体和修饰受体数相关,以量化海泡石表面的酸性K A 和基本K D 参数。从参数K A 和K D 获得的值表明海泡石表面呈酸性。

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