 This study reports the synthesis and characterization of four mesoporous niobium oxide photocatalytic materials, their correlation with physicochemical properties, and their photocatalytic activity in removing contaminants through the oxidation of methanol. 9B03 shows higher activity due to its microstructure, sodium composition, low particle size, and high specific surface area, while NB205 has lower reaction rates due to its relatively high average particle size. No significant differences in light absorption and scattering are observed among the materials, suggesting that their photonic efficiency is influenced by charge recombination. This article was authored by Lydian A. Moray, Christina Adon, Antonio S. Rojo, and others.