Visible light driven mesoporous Mn and S co-doped TiO2 nano material: Characterization and applications in photocatalytic degradation of indigocarmine dye and antibacterial activity

Lakshmi, K. V.; Rao, T. Siva; Padmaja, Jyothi; Raju, Imandi Manga; Alim, Samiul; Kalyani, P.

doi:10.1016/j.enmm.2018.11.001

Cited by 17 publications

(9 citation statements)

References 50 publications

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“…Among the various metal ion dopants studied so far, transition metal ion dopants can greatly reduce the bad gap and electron-hole recombination by forming an extra energy level below the conduction band of TiO 2 due to the interaction of their 3d or 4d states with Ti 3d states [4]. Recently, Divya Lakshmi et al [5] reported that Manganese (Mn 2+ ) is most preferable among the transition metals owing to the presence of t 2 g orbital of d is very close to the conduction band of TiO 2 by which the absorption can be possibly shifted to the visible part of the spectrum. On the other hand, others [6][7][8] investigated the effect of Magnesium (Mg 2+ ), an alkaline earth metal, on the crystalline structure and catalytic activity of TiO 2 and found its absorption band was shifted more towards the visible region, which resulted in performing a high photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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

Miditana

Tirukkovalluri

Raju

et al. 2021

Sustain Environ Res

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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.

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Section: Introductionmentioning

confidence: 99%

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

Miditana

Tirukkovalluri

Raju

et al. 2021

Sustain Environ Res

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“…[45] These ROS acts as oxidizing agents which can inhibit the growth of the organism. [8,46] Thus, here NIR-irradiated enhancement of antibacterial activity can attributed to the photothermal effect and associated ROS generation.…”

Section: Chemcatchemmentioning

confidence: 94%

Enhanced Photocatalytic Hydrogen Evolution and Antibacterial Activities of Ternary Chevrel Phases

et al. 2023

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“…N, S, Rh and Mn) in as well as have already been done 38 , 39 , 54 – 61 . A very few experimental studies also exist on N-Mn and S-Mn codoped as well 62 , 63 . However, for the codoping (viz.…”

Section: Introductionmentioning

confidence: 99%

Theoretical insights of codoping to modulate electronic structure of $$\hbox {TiO}_2$$ and $$\hbox {SrTiO}_3$$ for enhanced photocatalytic efficiency

Kumar

Basera

Saini

et al. 2020

Sci Rep

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$$\hbox {TiO}_2$$ TiO 2 and $$\hbox {SrTiO}_3$$ SrTiO 3 are well known materials in the field of photocatalysis due to their exceptional electronic structure, high chemical stability, non-toxicity and low cost. However, owing to the wide band gap, these can be utilized only in the UV region. Thus, it’s necessary to expand their optical response in visible region by reducing their band gap through doping with metals, nonmetals or the combination of different elements, while retaining intact the photocatalytic efficiency. We report here, the codoping of a metal and a nonmetal in anatase $$\hbox {TiO}_2$$ TiO 2 and $$\hbox {SrTiO}_3$$ SrTiO 3 for efficient photocatalytic water splitting using hybrid density functional theory and ab initio atomistic thermodynamics. The latter ensures to capture the environmental effect to understand thermodynamic stability of the charged defects at a realistic condition. We have observed that the charged defects are stable in addition to neutral defects in anatase $$\hbox {TiO}_2$$ TiO 2 and the codopants act as donor as well as acceptor depending on the nature of doping (p-type or n-type). However, the most stable codopants in $$\hbox {SrTiO}_3$$ SrTiO 3 mostly act as donor. Our results reveal that despite the response in visible light region, the codoping in $$\hbox {TiO}_2$$ TiO 2 and $$\hbox {SrTiO}_3$$ SrTiO 3 cannot always enhance the photocatalytic activity due to either the formation of recombination centers or the large shift in the conduction band minimum or valence band maximum. Amongst various metal-nonmetal combinations, $$\hbox {Mn}_\text {Ti}\hbox {S}_\text {O}$$ Mn Ti S O (i.e. Mn is substituted at Ti site and S is substituted at O site), $$\hbox {S}_\text {O}$$ S O in anatase $$\hbox {TiO}_2$$ TiO 2 and $$\hbox {Mn}_\text {Ti}\hbox {S}_\text {O}$$ Mn Ti S O , $$\hbox {Mn}_\text {Sr}\hbox {N}_\text {O}$$ Mn Sr N O in $$\hbox {SrTiO}_3$$ SrTiO 3 are the most potent candidates to enhance the photocatalytic efficiency of anatase $$\hbox {TiO}_2$$ TiO 2 and $$\hbox {SrTiO}_3$$ SrTiO 3 under visible light irradiation.

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Visible light driven mesoporous Mn and S co-doped TiO2 nano material: Characterization and applications in photocatalytic degradation of indigocarmine dye and antibacterial activity

Cited by 17 publications

References 50 publications

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

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

Enhanced Photocatalytic Hydrogen Evolution and Antibacterial Activities of Ternary Chevrel Phases

Theoretical insights of codoping to modulate electronic structure of $$\hbox {TiO}_2$$ and $$\hbox {SrTiO}_3$$ for enhanced photocatalytic efficiency

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