Degradación de compuestos fenólicos utilizando fotocatalizadores de TiO2 dopado con vanadio

PALACIO, MADGALENA ; ROSSO, JANINA A.; VILLABRILLE, PAULA I.; MARTIN, MARCELA V.

Montevideo

Congreso; XXV Congreso Iberoamericano de Catalisis; 2016

Federación Iberoamericana de Sociedades de Catálisis (FISoCat) y Fac. de Qca. de la Universidad de la República (Udelar)

V-doped TiO2 materials (0.01, 0.05 and 0.10 nominal atomic %) were synthesized by the sol-gel method and characterized by XRD. Their performance as photocatalysts was studied by the degradation of phenol, 4-nitrophenol and 4-chlorophenol with UV lamps.It was found that the materials prepared using VO(acac)2 as vanadium precursor had better efficiency than those prepared from NH4VO3. The optimum content was 0.01 nominal atomic %. No improvement was seen in the efficiency of phenol degradation by increasing the calcination temperature.The best photocatalyst was prepared from VO(acac)2, with vanadium content of 0.01 nominal atomic %, calcining at 400° C without airstream (0.01VTi-400): total degradation of phenol (50μM) in 3 hours by irradiation with UV lamps.To evaluate the efficiency of this catalyst in the degradation of other structurally related compounds, two substituted phenols were selected: 4-chlorophenol and 4-nitrophenol. The 0.01VTi-400 photocatalyst showed to be applicable to the degradation of phenolic compounds when the substituent is an activating groups or a weakly deactivating group (for electrophilic reactions).