Studying the Adsorption Properties of Mesoporous Silica Gels Doped with Terbium, Dysprosium, Lanthanum and Modified with Nickel Using the Reverse Gas Chromatography Method

The adsorption properties of mesoporous silica gel synthesized by the template method, doped with terbium, dysprosium, lanthanum and modified with nickel (Tb-Ni/MS, Dy-Ni/MS, La-Ni/MS) were studied using gas chromatography. The textural characteristics of the obtained materials were studied by low-temperature nitrogen adsorption-desorption method, atomic emission spectroscopy (ICP), X-ray phase analysis (XPA), X-ray structural analysis (XRD), and scanning electron microscopy (SEM). Thermodynamic characteristics of adsorption (differential heats and entropies) of test organic compounds were obtained using the inverse gas chromatography method. It has been established that the nature of the dopant leads to changes in the heats of adsorption for compounds prone to various types of specific interactions. It has been shown that mesoporous silica gels doped with dysprosium, terbium and modified with nickel enhance dispersion interactions of linear hydrocarbons with the sorbent surface; the heat of adsorption of compounds prone to specific interactions is higher on mesoporous silica gel doped with lanthanum and modified with nickel.