Enhanced Photocatalytic Removal of Methylene Blue From Seawater Under Natural Sunlight Using Carbon-Modified n-TiO2 Nanoparticles

摘要

In this study, photocatalytic removal of methylene blue (MB) from natural seawater was examined using carbon-modified titanium oxide (CM-n-TiO 2 ) nanoparticles under illumination of real sunlight. CM-n-TiO 2 nanoparticles exhibited significantly higher photocatalytic degradation efficiency compared to unmodified n-TiO 2 . Photocatalytic removal studies were carried out at different initial dye concentrations (5-30 μM), catalyst dose (0.5-1.5 gL -1 ), and pH (3-9). The highest removal rate of MB was obtained at the optimal conditions of pH 8 and 1.0 gL -1 of CM-n-TiO 2 . The solar photocatalytic removal of MB from seawater using CM-n-TiO 2 obeyed a pseudo-first order kinetics according to the Langmuir-Hinshelwood model.