The effect of nanoparticle size on adsorption thermodynamics was investigated. The results of theoretical and experimental research show that there are remarkable effects of particle size on the equilibrium constant and thermodynamic properties of nanoadsorption. The adsorption equilibrium constant increases, while the molar Gibbs free energy decreases as the diameter of the nanoparticle decreases. The effects of particle size on the molar enthalpy and the molar entropy are also dependent on the actual adsorption system. Thermodynamic properties DaGom, DaHom, DaSom and ln K have linear relations with the reciprocal of the diameter of the nanoparticle. The results of this study could provide some theoretical insight with high application value for nanoadsorptive processes.
Acknowledgments
This work was supported by the Natural Science Foundation of China (21373147) and by the Program for the Top Science and Technology Innovation Teams of Higher Learning Institutions of Shanxi Province of China.