After applying the two adsorption kinetic models onto the data obtained using different mordants (copper, aluminum and tin): pseudo first order and pseudo second order, pseudo second order model gives a higher R^2 value. Even though pseudo second order model gives me a higher R^2 value for all the mordants tested but when I plot the graph of ln (k) vs 1/T to determine the activation energy the graph of the rate constant determined from pseudo first order reaction gives me a significantly higher value than the graph of the rate constant determined from the pseudo second order model.  I am confused as to which model is better suited to my research. After doing a lot of literature review, the conclusion drawn was that pseudo second order model fits the data well for all dye adsorption processes as it gives high R^2 value thereby representing a chemisorption process.