Investigation of optimum Mn dopant level on TiO₂ for dye degradation

Pristine and Mn-TiO₂ photocatalysts was prepared employing sophisticated hydrothermal technique. TiO₂, 0.2 M, 0.4 M Mn-TiO₂ photocatalysts analysis were done by using standard characterization studies. The morphology of the pure TiO₂ photocatalyst showed the large agglomeration of nanoparticles. While the dopant Mn ions influenced higher on host lattice TiO₂. The 0.2 M Mn added TiO₂ photocatalyst showed no agglomeration and nanoparticles size were decreased. On increasing dopant level, there is growth of nanorods along with nanoparticles which greatly helped in dye degradation. The prepared photocatalysts photocatalytic action was investigated on reducing MG dye. Prepared photocatalyst added dye mixtures were exposed under visible light and collected for every 15 min. 0.4 M Mn-TiO₂- MG sample showed 96% efficiency on degrading MG dye. The dopant has increased electrons and holes recombination on host surface. 0.4 M Mn-TiO₂-MG sample rate constant was higher than other samples and reaction system abide by Pseudo first order kinetics. 0.4 M Mn-TiO₂ photocatalyst be an efficient and enthusiastic potential material to remove organic pollutants.