## 3 Results  
Figure 1 shows the UV-Vis spectra obtained from the commercial dye under initial conditions (solid black line) and after treatment with an imposed current density of 2 mA cm\({}^{-2}\) and UV light (solid purple line). The spectra correspond to Experiment 7 of the experimental design. The dye's absorption bands, which are characteristic of the individual components, were observed at 428, 530, and 630 nm. These wavelengths correspond to the specific dyes present in the commercial mixture: Tartrazine [25], Erythrosine [26], and Brilliant Blue [27], respectively. To analyze the reduction in dye molecules, the spectra were deconvoluted (dashed lines), allowing for the determination of peak values for each absorption band. This analysis provides insight into the extent of dye degradation under the experimental conditions applied. The bathochromic shifts observed are likely to be due to changes in the environment of the chromophore groups, which could be influenced by factors such as pH, solvent, or interactions with other components in the system. Additionally, an absorption region is observed in the near-ultraviolet wavelength region, indicating the dye's susceptibility to reacting in this range. The decreases in absorption at 428, 530, and 630 nm post-photoelectrochemical treatment are attributed to the reduction in dye concentration resulting from the breakage of chromophore bonds [28]. However, for a more in-depth analysis of the degradation process, the experimental design variables were examined through a multivariate analysis of variance (MANOVA). The Table 2 presents the results of the multivariate analysis of variance (MANOVA) for the effect on the evaluated output parameters, considering imposed current, UV light, and their combined influence. The parameters studied included dye degradation, cell potential, recovered mass, and pH. Significant differences in the variance of these parameters at different imposed current values are evident, as indicated by the rejection of [PERSON]'s Largest Root statistical test with a probability level of zero. Figure 1: Comparison of UV-Vis spectra between the dye at 100% of the manufacturer’s suggested concentration (black) and post-photoelectrochemical treatment (purple). Additionally, deconvoluted peaks associated with each dye are shown (dashed lines). On the other hand, the variance due to the imposition of UV light is accepted; however, it shows a statistical test with a low probability value (0.23), indicating a slight effect. This is evident in the changes in response parameters such as the degradation of Tartrazine and Erythrosine, as well as cell potential and pH, which exhibit significant variance when UV light is imposed. The combination of current and UV light primarily affects the degradation of Tartrazine and Brilliant Blue, and pH, with their variances being significantly different. It is noteworthy that no significant effects are observed in the variances in cell potential and recovered mass. This is because sediment production depends solely on the electrochemical process and is only dependent on the imposed current. It should be noted that this study focused on evaluating the degradation process under controlled conditions, with temperature and UV intensity maintained as constant. The effect of temperature on reaction rates was considered based on Arrhenius behavior, while UV intensity was standardized using a commercially available system. Scaling up the technology and addressing the impact of these variables on a larger scale were not part of the scope of this work and would require further research.