Comparative study of the physicochemical propeties and photocatalytic activity of modified mcm-41 synthesized by direct (one-step) incorporation and impregnation

ELIAS V; E. SABRE; CASUSCELLI S; EIMER G

QUíMICA NOVA

SOC BRASILEIRA QUIMICA

Lugar: San Pablo; Año: 2016 vol. 39 p. 548 - 553

0100-4042

MCM-41structures were synthesized and modified by direct (one-step) incorporation and wet impregnation (WI) methods. The solids were characterized by XRF, XRD, N2 adsorption and UV-Vis DR, and catalytically evaluated in the Acid Orange 7 (AO7) degradation under visible light. It was possible to infer the significant influence of the presence, dispersion and location of the different Cr species on the photoactivity. Both synthesis methods allow the higher dispersionof the photoactive Cr species for the lower metal content, which enhances the efficiency for dye degradation. Particularly, after the Ti loading in samples synthesized by DI, the notable AO7 degradation increase was associated with the strong heterojunction between Ti and Cr6+ species, which are highly dispersed due to the DI method used.