Specific features of the adsorption of chlorinated methanes and water on carbon nanotubes and alumina

Resumo

The adsorption of CH₂Cl₂, CH₃Cl, CCl₄, and H₂O vapors on the surface of multi-walled carbon nanotubes and alumina in the temperature range of 10—25 °C was studied. Dependences of the isosteric heat of adsorption on the surface coverage were plotted. The initial heat of adsorption of dichloromethane, chloroform, and CCl₄ on Al₂O₃ was found to be equal to 71, 28, and 31 kJ mol^–1, respectively. In most cases, adsorption on the oxide adsorbent was characterized by a higher heat of adsorption compared to that found on the carbon material, which is apparently related to chemical interaction of sorbed molecules with the OH groups of the alumina surface.