May any one help on how to fix Ce on the X-axis when plotting isotherms of different adsorbents on the same set. I seen a lot of publications having different adsorbents however, they are able to plot qe vs Ce on the same axis, how possible is this because different adsorbents attain different Ce? I have managed to calculate both Ce and qe of each of my 10 different adsorbents however, I find it difficult on how to manipulate their isotherms on the same plot since both Ce and qe are different for each adsorbent.