Photocatalytic activity of TiO2/stevensite nanocomposites for the removal of Orange G from aqueous solutions

Lahcen Bouna (1) , Benaïss Rhouta (1) , Francis Maury (2) , Amane Jada (3) , François Senocq (2) , Marie-Christine Lafont (2)

1 LMCN - Laboratoire de Matière Condensée et Nanostructures
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 IS2M - Institut de Science des Matériaux de Mulhouse

TiO2/stevensite nanocomposite photocatalysts were synthesized by a solvothermal method using TiCl3/HCl as reactants and the stevensite clay mineral extract as support. The prepared photocatalyst samples were then characterized using various techniques such as X-ray diffraction (XRD), Infrared spectroscopy (IR) and Transmission Electron Microscopy (TEM). The Points of Zero Charge (PZC) of the various samples were evaluated by titration of the non-modified and the Ti-modified clay aqueous dispersions, with cationic surfactant solutions. The photocatalytic activity of the resulting nanocomposites samples were evaluated for the removal of Orange G (OG) from aqueous solution as a model dye pollutant. The data indicate that the formation of Na+-stevensite by the TiO2 particles leads to TiO2/stevensite nanocomposites having higher specific surface areas and mesopore volumes, and lower PZC values. Further, the photocatalytic activity was found to be greater for the TiO2/stevensite nanocomposites having the greatest Ti amount, as compared to a pure TiO2 sample, and increased with the increase of the TiO2 amount in the TiO2/stevensite nanocomposites.

Mots clés: Clay; Titanium dioxide; Stevensite; Photocatalysis; Streaming induced potential; Nanocomposites

Domaines: Génie chimique

Lahcen Bouna, Benaïss Rhouta, Francis Maury, Amane Jada, François Senocq, et al.. Photocatalytic activity of TiO2/stevensite nanocomposites for the removal of Orange G from aqueous solutions. Clay Minerals, 2014, vol. 49 (n° 3), pp. 417-428. ⟨10.1180/claymin.2014.049.3.05⟩. ⟨hal-01172422⟩