This shows that both of our systems were dominated by chemisorption in which the mode of operation was the electrostatic interaction between anionic surface carbonate groups within the SC and the positive charges on the two cationic dyes. When an anionic dye, mordant orange, was used no uptake was observed by either physical observation or UV/Vis analysis, and no change occurred in the optical property the SC material (Figure and Figure ). This was indicative of repulsion between the SC and the mordant dye and further solidifies the mechanism of adsorption of the SC material. The rate constant for the adsorption of SO (k 2 =0.051) was slightly higher than MB (k 2 =0.031), which suggest that the uptake for SO onto the surface of the material was slightly quicker than for MB.