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Additional Information:• This paper was accepted for publication in the journal Applied Cataly- TiO 2 and B-doped TiO 2 catalysts were synthesized using a sol-gel procedure. The 11 photocatalysts were characterized by ICP-EOS, N 2 adsorption-desorption, XRD, XPS, 12and DR-UV-Vis spectroscopy. Four recalcitrant pesticides (diuron, o-phenylphenol, 2-13 methyl-4-chlorophenoxyacetic acid (MCPA) and terbuthylazine) were subjected to 14 degradation by ozonation, photolytic ozonation, photocatalysis and photocatalytic 15 ozonation using the prepared catalysts under simulated solar irradiation in a laboratory 16 scale system. The B-doped TiO 2 catalysts, with 0.5-0.8 wt.% of interstitial boron, were 17 more active than bare TiO 2 for the removal and mineralization of the target compounds. 18The combination of ozonation and photocatalysis led to faster mineralization rates than 19 the treatment methods considered individually and allowed the complete removal of the 20 pesticides below the regulatory standards. The B-doped catalyst was stable and 21 maintained 75% mineralization after three consecutive runs.

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