Gemini surfactant assisted synthesis of mesoporous Mn/Mg bimetal doped TiO2 nanomaterial: Characterization and photocatalytic activity studies under visible light irradiation

Abstract

The present work mainly aimed to synthesize different weight percentages (0.25-1.00 wt%) of Manganese (Mn2+) and Magnesium (Mg2+) bimetal ions doped TiO2 nanomaterial assisted with different weight percentages (5-15 wt%) of Gemini Surfactant (GS) using sol-gel method. The bimetal doped and undoped TiO2 photocatalysts were characterized by X-ray Diffraction, Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR), UV-Visible Diffused Reflectance Spectroscopy, Transmission Electron Microscopy, Brunauer-Emmett-Teller surface area analyzer, and Photoluminescence Spectroscopy. Characterization results revealed that mesoporous multi-particle anatase TiO2 nanoparticles with a narrowed band gap, small particle size, and high surface area were formed due to the combined effect of Mn2+/Mg2+ bimetal ions doping and effective encapsulation of GS over the initially formed TiO2 nanoparticles. The surface elemental composition of the 0.25 wt% Mn2+& 1.00 wt% Mg2+ bimetal doped TiO2 in presence of 10 wt% of Gemini surfactant (after calcination) revealed the presence of both the metal dopants Mn2+ and Mg2+ along with the Ti and O and their chemical interactions were further confirmed by FT-IR results. The photocatalytic activity of these catalysts was assessed by the degradation of Methyl Red (MR) using visible light irradiation. To understand the effect of different reaction parameters on the photocatalytic activity of the nanocatalysts such as the dopant concentration, GS concentration, catalyst dosage, solution pH, and initial dye concentrations were investigated and optimized to achieve the best performance. The photoluminescence results conclude that OH radicals are the crucial reactive species responsible for oxidative photocatalytic degradation of MR.

Enhanced Photocatalytic Performance of Nb Doped TiO2/reduced Graphene Oxide Nanocomposites Over Rhodamine B Dye Under Visible Light Illumination

“…However, due to large band gap energy 3.2 eV (anatase TiO 2 ) and poor electron mobility, it shows very limited photosensitization in the visible range of Earth's solar spectrum. To overcome the grand challenges, several efforts have been made by researchers such as transition and noble metals doping [9,10], semiconductors coupling [11], surface polymer sensitization [12,13] and combination with carbonaceous materials [14]. In particular, metal ion doping of TiO 2 along with carbonaceous material combination is the emerging area at present in the photocatalysis.…”