Studying the synthesis regularities of adsorbents based on the oxides Li4Ti5O12 and Li2TiO3

Abstract

Using solid-phase, hydrothermal and sol-gel synthesis methods, adsorbents based on double oxides Li2TiO3 and Li4Ti5O12 were obtained. The influence of the synthesis conditions of samples on their phase composition, surface morphology, texture and adsorption properties was studied. It has been established that as a result of solid-phase synthesis reactions initiated by heating at 700 and 800 °C, single-phase oxides Li4Ti5O12 and Li2TiO3 are obtained, the values of the parameter a of the crystal lattice of which are close to the reference data and are 8.289 and 5.026 Å, respectively. The samples have a macromesoporous texture and have a low specific surface area (8 and 9 m2/g) and a mesopore volume (0.01 and 0.02 cm3/g). The adsorption capacity of the obtained oxides Li4Ti5O12 and Li2TiO3 reaches 7.9 and 6.3 mmol/g, respectively. The obtained oxides are of interest for further research as selective adsorbents of Li+ ions.