Infrared study of the adsorption of ethyl ethanoate on barium sulphate

Abstract

Infrared spectra of ethyl ethanoate adsorbed on barium sulphate show that liganding interactions with Lewis-acidic Ba²⁺ cation sites constitute the dominant mode of adsorption. Infrared bands at 1700, 1685 and 1665 cm^–1 are ascribed to liganded ethyl ethanoate at three types of surface site. There was slight evidence for dissociative adsorption leading to adsorbed ethanoate anions. The arrays of ions in the exposed {001} and {210} planes of barium sulphate are considered in relation to infrared results for the adsorption of ammonia, pyridine and carboxylic acids on barium sulphate.