Advanced Oxidation Process UV/H₂O₂ Applied to the Treatment of Synthetic Industrial Effluent Containing Different Organic Dyes

Objective: The objective of this study is to investigate dye removal through the application of advanced oxidation using hydrogen peroxide and ultraviolet light. Theoretical Framework: Dyes are molecules that, even at low concentrations, can alter the color of a product. In most cases, they are resistant to degradation by biological processes and generally exhibit low removal efficiencies. For these cases, in which biological treatment is ineffective, Advanced Oxidation Processes (AOPs) emerge as an effective alternative for the treatment of effluents containing toxic and biologically recalcitrant pollutants. AOPs involve the generation of highly reactive and non-selective oxidizing species, particularly hydroxyl radicals (•OH), to degrade persistent pollutants in industrial effluents, surface water, and groundwater. The UV/H₂O₂ process is an AOP that offers several advantages over other processes, mainly because it does not generate solid residues post-reaction; it is entirely consumed and does not produce byproducts. Method: The methodology adopted in this research involved the use of a bench-scale photochemical reactor in which the dyes Cromax Yellow AT, Cromax Blue AT, and Brown were applied. Dye removal was achieved through advanced oxidation using hydrogen peroxide (H₂O₂) and ultraviolet light (UV). Data collection was conducted through spectrophotometry.Results and Discussion: The results obtained revealed [synthesize the main results of the research]. In the discussion section, these results are contextualized in light of the theoretical framework, highlighting the implications and relationships identified. Possible discrepancies and limitations of the study are also considered in this section. Results and Discussion: Color removal efficiencies of 85% and 95% were obtained at 30 and 60 minutes, respectively, for Cromax Yellow AT, Cromax Blue AT, and Brown. The dye removal kinetics were determined to follow a pseudo-first-order model, with a pseudo-first-order rate constant of 8.75 × 10⁻² min⁻¹ and a half-life of 7.92 minutes. Research Implications: The results demonstrate that advanced oxidation using H₂O₂ and UV is effective for removing the studied dyes, which is relevant for environmental protection and pollutant mitigation. Originality/Value: This study contributes to the literature by evaluating the removal efficiency through the application of H₂O₂ and UV, both of which are readily available and easy to apply. The relevance and value of this research are underscored by its practical implications for effluent treatment.