Fluorine-doped SnO2-based dimensionally stable anodes for mineralization of methylene blue.

In this work, fluorine-doped SnO₂-based dimensionally stable anode (DSA) types were fabricated as electrocatalytic materials to degrade methylene blue (MB) in water. The materials were obtained by using a modified Pechini method. The F-doping in anodes improved the electrocatalytic properties, which were reflected by the decrease in the Tafel slope (from 820 to 338 mVdec⁻¹) and during the MB degradation process. A ~ 98% degradation was achieved on the F-doped anode with Cl⁻ ions in the reaction media. The Cl⁻ addition improved the degradation kinetics (k_PSO = 0.025 min⁻¹), and the MB degradation pathway was corroborated through liquid chromatography coupled with mass detection. The doped anode showed more than 98% of MB mineralization for 5 cycles. The obtained anodes are low cost and effective electrocatalytic materials for wastewater treatment applications. [ABSTRACT FROM AUTHOR]