Abstract
The present study reports the sol–gel synthesis and characterization of pure titania and metal-ion (Manganese) modified photocatalysts. The XRD results of pure titania confirmed the tetragonal structure having anatase as the predominant crystalline phase with no conspicuous presence of any secondary phase. In the modified photocatalysts, the shift in the peak position toward lower 2θ value reflects that manganese is occupying Ti position in TiO2 matrix. The position and width of the Raman peaks of the modified photocatalysts varies with oxygen vacancy and Mn doping level. Ti3+ and oxygen vacancies increased in the modified photocatalysts indicating a remarkable redshift of the absorption edge. Photoluminescence studies confirmed the formation of oxygen vacancy in TiO2 lattice and a decrease in intensity was observed after doping of Mn ions in TiO2. The maximum electrical conductivity of 2.85 × 10–2 S/cm was delivered by Mn2+@TiO2- D photocatalyst, which is more than fourfold of the pure TiO2 photocatalyst. Photocatalytic activity performances were evaluated by irradiating the sample degradation of methylene blue dye under visible light exposure. Mn2+@TiO2-C photocatalyst exhibits great improvement of photocatalytic activity (96%) within 120 min. It is found that Mn2+ doped TiOp2 hotocatalyst bleaches MB much faster than pure TiO2 since the transition metal ions can enhance photocatalytic activity. Mn2+@TiO2-C exhibited two times higher degradation activity toward MB compared to pure TiO2 suggesting that doping Mn2+ into TiO2 could very much enhance the photocatalytic performance and thus aid in environmental application.
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Shyniya, C.R., Rajasekaran, T.R. Investigation on influence of manganese nanoparticles loading in electrochemical activity of anatase titania catalysts and its role in photocatalytic performance. J Opt 51, 246–259 (2022). https://doi.org/10.1007/s12596-021-00775-y
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DOI: https://doi.org/10.1007/s12596-021-00775-y