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+ and 1.00 wt% Mg2+ bimetal doped TiO2 in the presence of 10 wt% of GS (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 using visible light irradiation. To understand the effect of different reaction parameters on the photocatalytic activity of the nanocatalysts such as the dopant concentration, surfactant concentration, catalyst dosage, solution pH, and initial dye concentration 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 Methyl Red.

Synergistic effects of Mg doping on TiO2 for improved toxic gas sensing performance at room temperature

“…The diffraction peaks at 2θ values of 25.3 2. This is consistent with previous research [35,36], indicating that adding Mg 2+ ions did not affect the crystal structure of TiO 2 . Mg doping into TiO 2 resulted in decreased intensity and slight peak shifts in XRD patterns, indicating the overshadowing of TiO 2 diffraction by Mg ions [37].…”

Nanostructured TiO2 Sensitized with MoS2 Nanoflowers for Enhanced Photodegradation Efficiency toward Methyl Orange

“…To tackle the above issues, photocatalysis needs to have a design of a heterostructure platform so that it separates the charge and prevents electron–hole pair recombination by transporting more electrons . A number of techniques such as metal or non-metal doping, formation of heterostructures, creation of oxygen vacancy defects, and surface sensitization have been engaged to reduce the wide band gap and extend illumination response to visible range. ,− Among these strategies, surface sensitization of TiO 2 is an effective approach to enhance photocatalytic performance; additionally, surface sensitization contributes to shrinking the crystallite size and band gap of TiO 2. , It is carried out with different approaches like metal deposition, dye sensitization, and attachment of co-catalysts and quantum dots to modify the properties of the host …”

Enhanced photocatalytic removal of nitric oxide over Ag-decorated ZnSn(OH)6 microcubes

“…Nitric oxide (NO) is a primary component of NO x released during combustion processes [6], together with nitrogen dioxide (NO 2 ) which is more harmful than NO [7]. Extensive research on photocatalytic NO x removal from ambient air or ue gas has been performed using various methods, such as selective catalytic reduction, selective non-catalytic reduction, bio ltration, adsorption, absorption, and absorption photocatalytic [8][9][10][11]. Among them, photocatalytic materials have attracted much attention due to their great potential, including eco-friendly, low-cost, high e ciency, and non-toxic [12,13].…”