Adsorption Properties of Nanodiamond with a Hydrogenated SurfaceстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 17 июля 2024 г.
Аннотация:Direct modification of surface properties is one of the methods that are used to prepare new nanomaterials. The surface of detonation nanodiamond can be modified, for example, by treatment with gaseous hydrogen. In the present work, the adsorption properties of nanodiamonds with a hydrogenated surface were examined by the method of inverse gas chromatography and compared with those of the initial detonation nanodiamond. Specific retention volumes V and differential molar isosteric heats of adsorption qst were measured for water and heptane. It was established that the values of V for both water and heptane on hydrogenated nanodiamonds were several times higher than those for the initial detonation nanodiamonds. This fact indicated that additional treatment of the surface led to an increase in the density (per unit area) of functional groups, which ensured adsorption interactions of the surface with water and heptane. In the case of water, the heat of adsorption at a maximum content of the adsorbate in a gaseous phase increased from 31.6 to 36.3 kJ/mol, whereas the heat of heptane adsorption remained constant at a level of 49.5 kJ/mol. It was found that the surface hydrogenation of nanodiamonds changed the nature of the adsorption sites that are responsible for water retention.