The effect of TiO ۲ morphology and aqueous inorganic anions on the photocatalytic removal of methylene blue from artificial wastewater

Methylene blue (MB) is a cationic dye that poses environmental risks due to its toxicity. Titanium dioxide (TiO ₂) with different morphologies is an effective photocatalyst for degrading such pollutants. This study compared TiO₂ nanosheets (TNSs) and nanoparticles (TNPs) as two-dimensional (۲D) and zero-dimensional (۰D) photocatalysts for degradation of MB under UV and visible light irradiation. TNSs showed a higher percentage of degradation of MB (۵۱.۸۴% under visible light and ۷۸.۹۰% under UV) than TNPs (۵.۷۰% under visible light and ۲۵.۲۲% under UV) due to their high surface area and ۲D structure. Also, the presence of inorganic anions like OH−, CO۳۲−, and HCO۳− enhanced the photocatalytic degradation of MB. These findings confirmed the adsorption of MB is essential before degradation, and the degradation rate was significantly enhanced at pH = ۱۲ due to the negative charge of TNSs surface and the positive charge of MB.

کلیدواژه ها:

TiO ۲ Nanosheets ، TiO ۲ Nanoparticles ، Methylene Blue ، Photocatalytic Degradation ، Inorganic anions