*2.10. Degradation of DB78 by an Advanced Oxidation Process*

The adsorption experiment was carried out using different dye concentrations. After 140 min of contact time and 300 mg/L of dye, the remaining dye in the solution was 144 mg/L. The experiments were performed in triplicate, which means that 144 mg/L was the average of the three repetitions. Then, 18 mL of the unadsorbed dye solution was mixed with 2 mL of a H2O2 solution that rendered a final H2O2 concentration of 840 mg/L. This rendered an H2O2/DB78 ratio of 200 on molar basis, which is enough to avoid making H2O2 the limiting reagent of the photochemical reaction. The mixture was placed in a pulsed light system (XeMaticA-Basic-1L, Steribeam, Germany) operated at 2.5 kV that supplied 2.14 J/cm<sup>2</sup> per pulse of a broad-spectrum light that included UV light, the spectrum of which has been previously reported [43]. Treatments were prolonged using multiple pulses up to 120 and carried out in duplicate. Samples were withdrawn every five pulses to measure absorbance. Data were normalized and adjusted to pseudo-first order kinetics (Equation (12)) to calculate the degradation rate.

$$
\ln \frac{\text{C}}{\text{C}\_0} = -kF \tag{12}
$$

where *C* is the concentration at fluence *F* (J/cm2), *C*<sup>0</sup> is the initial concentration, and *k* is the pseudo-first order rate constant (cm2/J). Data were processed using Excel 2010 (Microsoft, Redmond, WA, USA).
