超声波场影响Langmuir吸附相平衡的机理分析  

Mechanism Analysis of Phase Equilibrium of Langmuir Adsorption in Ultrasonic Field

作　　者：郭平生[1] 韩光泽[1] 华贲[1] 

机构地区：[1]华南理工大学化工与能源学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2006年第10期25-29,34,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家973重点规划项目(G2000026307);华南理工大学传热强化与过程节能教育部重点实验室访问学者资金项目(KF0503);广西师范大学博士科学研究启动基金项目

摘　　要：从分子动力学规律出发,建立了Langmuir吸附系统在外场作用下的吸附相平衡关系式,并根据超声条件下吸附相分子的受迫振动和非吸附相分子的波动,分别讨论了吸附相分子及非吸附相分子在超声波场中获得的能量,结果表明:在超声波场中,吸附相分子比非吸附相分子获得更多的能量是Langmuir吸附平衡等温线降低的本质所在.理论结果进一步表明:当超声波频率一定时,Langmuir平衡吸附量随超声波场能流的增大而减少;当超声波能流一定时,可通过调节超声波频率达到吸附相分子的固有频率而使吸附相分子获得最大的能量,从而使Langmuir平衡吸附量最小.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 adsorption phase and the fluctuation of the molecules in the fluid phase within an ultrasonic field, the energies obtained by the molecules in both the adsorption phase and the fluid phase are 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 phase. Furthermore, the theoretical analysis show that, when the ultrasonic frequency remains constant, the adsorbed amount in Langmuir adsorption phase equilibrium decreases with the increase in ultrasonic energy flow, and 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 adsorption phase can obtain the maximum energy by regulating the ultrasonic frequency to the natural frequency of the molecules, thus minimizing the adsorbed amount in Langmuir adsorption phase equilibrium.

关 键 词：LANGMUIR吸附 相平衡方程 超声波场 吸附相 非吸附相 

分 类 号：O647.314[理学—物理化学] TQ021.9[理学—化学]