Determination and comparison of competitive isotherms by rectangular pulsemethod and frontal velocity analysis method

Two different approaches, the rectangular pulse method and a new method, th e frontal velocity analysis method are applied to the determination of comp etitive isotherms for two systems on ODS-silica. Both sets of experimental data are found to fit well to the competitive-langmuir isotherm equation. T he data obtained from the rectangular pulse method and the frontal velocity analysis method are in general agreement with each other and the best coef ficients of the competitive isotherms obtained with the two methods are clo se. This shows that the simpler and easier method, the frontal velocity ana lysis method can be used to determine binary competitive isotherms. (C) 200 1 Elsevier Science B.V. All rights reserved.