Adsorption kinetics of methyl violet onto TiO2 nanoparticles with different phases

TiO2 nanoparticles with different phase composition (anatase and rutile) were prepared from TiO2P25 Degussa by heat treatment and were characterized with XRD and TEM methods. It was found that both the particle size and rutile to anatase phase ratio increases with temperature. The adsorption of methyl violet from aqueous solution onto the prepared TiO2 nanoparticles with different was studied from kinetic point of view. The effect of phase composition on the adsorption kinetic was analyzed. The amount of adsorbed methyl violet reaches to its maximum vale within 100 min. It was found that the adsorption onto TiO2 with mixed phases of anatase and rutile is reversible while onto pure rutile phase is irreversible.

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► TiO2 nanopraticles show phase transition at 600–1000 °C from anatase to rutile.
► TiO2 nanopraticles can adsorb methyl violet molecules from aqueous solution.
► Adsorption onto anatase phase is reversible.
► Adsorption onto rutile phase is irreversible.