Abstract:

A phase equilibrium equation describing the Langmuir adsorption in external physical fields is established based on the theory of molecular dynamics.According to the forced vibration of the molecules in the adsorp.tion Dhase and the fluctuation of the molecules in the fluid phase within an ultrasonic field,the energies obtained by the naolecules in both the adsorption phase and the fluid phase ale then investigated.The results indicate that the decline of Langmuir adsorption isotherm is due to the greater energy obtained by the molecules in the adsorption Dhase.Furtherm ore.the theoretical analysis show that,when the ultrasonic frequency remains constant,the ad.sorbed amount in Langmuir adsorption phase equilibrium decreases with the increase in ultrasonic energy flow,and that when the ultrasonic energy flow remains constant,the molecules in the mum energy by regulating the ultrasonic adsorbed amount in Langmuir adsorption adsorp frequency to the natural frequency of the phase equilibrium.tion phase can obtain the maxi-molecules,thus minimizing the adsorbed amount in Langmuir adsorption phase equilibrium.

Key words: Langmuir adsorption, phase equilibrium equation, ultrasonic field, adsorption phase, fluid phase