Portal de Periódicos da CAPES

Boron doped TiO2 catalysts for photocatalytic ozonation of aqueous mixtures of common pesticides: Diuron, o-phenylphenol, MCPA and terbuthylazine

2014; Elsevier BV; Volume: 178; Linguagem: Inglês

10.1016/j.apcatb.2014.10.036

1873-3883

Diego H. Quiñones, A. Rey, Pedro M. Álvarez, Fernando J. Beltrán, Gianluca Li Puma,

Advanced oxidation water treatment

• B-TiO 2 catalysts for photocatalytic ozonation of pesticides mixture. • Leaching phenomena of non-structural boron. • Beneficial effect of interstitial B in TiO 2 for photocatalytic ozonation . • Stability and high efficiency of B-TiO 2 in mineralization . • Complete pesticides removal with 75% mineralization after 2 h. TiO 2 and B-doped TiO 2 catalysts were synthesized using a sol–gel procedure. The photocatalysts were characterized by ICP-EOS, N 2 adsorption–desorption, XRD, XPS, and DR-UV-Vis spectroscopy. Four recalcitrant pesticides (diuron, o-phenylphenol, 2-methyl-4-chlorophenoxyacetic acid (MCPA) and terbuthylazine) were subjected to degradation by ozonation , photolytic ozonation, photocatalysis and photocatalytic ozonation using the prepared catalysts under simulated solar irradiation in a laboratory scale system. The B-doped TiO 2 catalysts, with 0.5–0.8 wt.% of interstitial boron, were more active than bare TiO 2 for the removal and mineralization of the target compounds. The combination of ozonation and photocatalysis led to faster mineralization rates than the treatment methods considered individually and allowed the complete removal of the pesticides below the regulatory standards. The B-doped catalyst was stable and maintained 75% mineralization after three consecutive runs.