Effect of adsorption of nitroaromatic compounds on the characteristics of bound water layers in aqueous suspensions of activated carbons

Abstract

The impact of chemical treatment (oxidation, reduction) of microporous carbon prepared from plum stones on the structural parameters was analysed using the nitrogen adsorption method. The effects of pre-adsorption of 2,4,6-trinitrotoluene (TNT) and 1-chloro-2,4-dinitrobenzene (CDNB) on the characteristics of the interfacial water layers in the aqueous suspensions of these materials were explored using 1H NMR spectroscopy with freezing out of the bulk water between 210 and 273 K. Substantial variations in the Gibbs free energy of the interfacial water in the aqueous suspension of treated carbons were observed, especially for a reduced sample with pre-adsorbed nitroaromatics, due to changes in the hydrophilic–hydrophobic properties of the systems.