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Kinetics and Equilibrium Isotherms on Methyl Violet Adsorption by Arundo Donax Root Activated Carbon

Arundo donax root was used to prepare activated carbon by H 3 PO 4 activation for the removal of methyl violet (MV). The activated carbon has a micro-mesoporous structure with BET surface area 1392 m 2 /g. Pseudo-second-order model could predict the adsorption kinetics for the entire process. The sorption involved several stages and the actual rate controlling step was film diffusion for the whole process. The equilibrium data were better represented by Freundlich model than Langmuir model. The adsorption of methyl violet onto Arundo donax root activated carbon was spontaneous and endothermic.