Browsing by Author "Loayza Cueva, Camila Maite"

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    Estudio de la decoloración de colorantes en aguas residuales provenientes de la industria de paja toquilla mediante procesos de oxidación avanzada empleando como catalizador ferrita de zinc preparada con pilas usadas
    (Universidad de Cuenca, 2025-09-04) Loayza Cueva, Camila Maite; Pinos Vélez, Verónica Patricia
    This work evaluates the decolorization of wastewater from artisanal toquilla straw dyeing through photocatalysis and photo-Fenton processes, using zinc ferrite synthesized from commercial reagents and alkaline batteries as catalysts. The ferrites were prepared and characterized by assessing their structure, surface area, and porosity. It was observed that the battery-derived ferrite has a lower surface area but larger pores, which influences its catalytic activity. Photocatalysis experiments resulted in removals of the aniline red dye below 2%, whereas the photo-Fenton process achieved removals of 33.4% for ferrite from commercial reagents and 40.2% for battery-derived ferrite within 3 hours. Statistical analysis using ANOVA and post hoc tests found statistically significant differences between the decolorization percentages achieved with the photo-Fenton method, but no significant differences were observed by ferrite type in photocatalysis. The kinetic study revealed that the degradation follows a pseudo-first order model with an average rate constant of 0.003 min-1 and a 22 factorial design showed that both the catalyst amount and H2O2 dosage affect the efficiency. These results identified the most efficient treatment as the photo-Fenton process using ferrite obtained from alkaline batteries, confirming that this ferrite is a viable catalyst for wastewater treatment.