For the adsorption experiments, Methylene blue hydrate (MB) (CAS: 61-73-4) and Safranin-O (SO) (CAS: 477-73-6) were obtained from Fisher Scientific and Sigma-Aldrich respectively. Seven aqueous dye solutions of concentrations ranging from approximately 5 to 20 mg/L were made up for each dye, and approximately 5 g of SC were added to each solution.