profile for all compounds over time. After 15 min of treatment, it
was noticeable the high efficiency of the process for the practically
total degradation of gallic (96.4%) and 3,4-dihidroxybenzoic
(98.4%) acid. In the case of 3,4-dimethoxybenzoic, 3,4,5-
trimethoxybenzoic and 4-hydroxybenzoic acids, their removal
had a sharp increase between 15 and 30 min, achieving
their higher degradation (86.8–91.8%) at this time, while