Elaboration of Activated Carbon/Titanium dioxide granular composites by mechanosynthesis: effect of the composition on the sorption capacity and photocatalytic efficiency

E. Ribeiro (1) , G. Plantard (1) , V. Goetz (1)

1 PROMES - Procédés, Matériaux et Energie Solaire

Activated-Carbon/Titania composites (AC/TiO2) is a relevant option to gather the dual adsorption/photodegradation property within a single material. This work aimed to investigate the composition influence on the adsorption and photodegradation properties of AC/TiO2 composites against caffeine. TiO2 grafted AC powders covering the whole composition scale were synthesized by a one-step mechanical milling process. This original simple elaboration route led to the obtention of powders which particles size and composition were homogeneous and well controlled. When the adsorbent mass ratio varied in the range 0.01-0.75, the adsorption properties, i.e. apparent kinetic and maximum adsorption capacity of the composites increased respectively by 1and 2-log. At the opposite, the photo-oxidation rate decreased significantly when the adsorbent ratio increased.The simple elaboration route explored produces flexible AC/TiO2 composites with adjustable properties that can easily be managed to meet the requirements of different target applications.

Domaines: Milieux fluides et réactifs

E. Ribeiro, G. Plantard, V. Goetz. Elaboration of Activated Carbon/Titanium dioxide granular composites by mechanosynthesis: effect of the composition on the sorption capacity and photocatalytic efficiency. Journal of Photochemistry and Photobiology A: Chemistry, 2021, 408, pp.113108. ⟨10.1016/j.jphotochem.2020.113108⟩. ⟨hal-03369283⟩