Percorrer por autor "Silva, Arthur Mariani"
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- Advances in fenton and photo-fenton degradation of anionic surfactant SDBSPublication . Silva, Arthur Mariani; Martins, Artur; Pietrobelli, JulianaSurfactants are widely used in hygiene and cleaning products; however, their persistence in aquatic environments classifies them as emerging contaminants. This study aimed to evaluate the behavior and degradation efficiency of the anionic surfactant Sodium Dodecyl Benzene Sulfonate (SDBS) using Fenton and photo-Fenton Advanced Oxidation Processes (AOPs). Analytical monitoring of pollutant removal was performed using High-Performance Liquid Chromatography (HPLC). To optimize the operational variables – namely reaction time, pH, H2O2 and Fe2+ concentrations – Response Surface Methodology (RSM) and Analysis of Variance (ANOVA) were applied using Jamovi and RStudio software. The experimental results demonstrated that the photo-Fenton process significantly outperformed the conventional Fenton process, which was driven by UV radiation, promoting the continuous regeneration of Fe2+ ions and maximizing the generation of hydroxyl radicals (HO•). The reduced quadratic model for the photo-Fenton system was statistically significant (p = 0.013), highlighting reaction time as a critical factor (p = 0.024) and indicating a strong negative quadratic effect of iron concentration. The 3D response surfaces confirmed the presence of an optimal intermediate operation region, proving that excessive reagent dosages trigger scavenging effects, which limit further removal efficiency. The Fenton process achieved SDBS removal ranging from 22% to 52%, whereas the photo-Fenton process achieved SDBS removal ranging from 50% to 76%, demonstrating that both processes were effective and that UV irradiation enhanced the oxidative efficiency of the system. Ultimately, this study provides a robust technical framework aligned with the United Nations 2030 Agenda, directly contributing to Sustainable Development Goal 6 (Clean Water and Sanitation) by engineering efficient pathways for the removal of persistent surfactants from wastewater, while also aligning with SDG 12 (Responsible Consumption and Production) and SDG 14 (Life Below Water).