TiO2@SiO2 nanoparticles for methylene blue removal and photocatalytic degradation under natural sunlight and low-power UV light

Mahanta, Urbashi; Khandelwal, Mudrika; Deshpande, Atul Suresh

doi:10.1016/j.apsusc.2021.151745

Cited by 84 publications

(52 citation statements)

References 37 publications

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“…More trapped electrons are released, resulting in the formation of OH * free radicals. As a result, increasing the creation of electron-hole pairs maximizes the active organism's size and degradation performance [40][41][42][43][44]. The detailed mechanism is shown in Figure 7.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Shimi

Ahmed

Wahab

et al. 2022

Journal of Nanomaterials

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Metal oxide photocatalyst is one of the promising photocatalysts in the water remediation process. The present work is aimed at synthesizing the green production of TiO2 (G-TiO2) nanoparticles from mulberry plant extract. Plant phytochemicals serve a different role to produce the nanophase particles. The bioreductant is safer and noxious free compound for synthesizing the G-TiO2 nanoparticles. The synthesized G-TiO2 nanoparticles in anatase phase and their crystallite size of 24 nm were characterized from X-ray diffraction analysis. The Ti-O bonding and plant derivatives and their reduction were confined from FTIR analysis. The wide bandgap of G-TiO2 nanoparticles (3.16 eV) and their optical characterization were captured from UV-DRS analysis. The spherical surface morphology and their Ti and O elemental configurations were characterized from FESEM with EDX technique. The photocatalytic dye degradation was examined against methylene blue dye, and their pseudo-first-order kinetics were evaluated. The cyclic experiments declared their catalytic potential. The bacterial resistance of G-TiO2 nanoparticles was examined against gram-positive and gram-negative bacteria. Hence, the catalytic potential and bacterial stability of G-TiO2 nanoparticles are the powerful candidate for water remediation and biomedical applications.

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Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Shimi

Ahmed

Wahab

et al. 2022

Journal of Nanomaterials

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“…Physicochemical properties of the TiO S3. Comparative study of the photocatalytic activity with different TiO 2 /SiO 2 photocatalysts [59][60][61][62][63][64][65][66].…”

Section: Supplementary Materialsmentioning

confidence: 99%

Block Copolymer and Cellulose Templated Mesoporous TiO2-SiO2 Nanocomposite as Superior Photocatalyst

et al. 2022

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A dual soft-templating method was developed to produce highly crystalline and mesoporous TiO2-SiO2 nanocomposites. Pluronic F127 as the structure-directing agent and pure cellulose as the surface area modifier were used as the templating media. While Pluronic F127 served as the sacrificing media for generating a mesoporous structure in an acidic pH, cellulose templating helped to increase the specific surface area without affecting the mesoporosity of the TiO2-SiO2 nanostructures. Calcination at elevated temperature removed all the organics and formed pure inorganic TiO2-SiO2 composites as revealed by TGA and FTIR analyses. An optimum amount of SiO2 insertion in the TiO2 matrix increased the thermal stability of the crystalline anatase phase. BET surface area measurement along with low angle XRD revealed the formation of a mesoporous structure in the composites. The photocatalytic activity was evaluated by the degradation of Rhodamine B, Methylene Blue, and 4-Nitrophenol as the model pollutants under solar light irradiation, where the superior photo-degradation activity of Pluronic F127/cellulose templated TiO2-SiO2 was observed compared to pure Pluronic templated composite and commercial Evonik P25 TiO2. The higher photocatalytic activity was achieved due to the higher thermal stability of the nanocrystalline anatase phase, the mesoporosity, and the higher specific surface area.

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“…In addition to antibacterial activity, the enhanced photocatalytic activity of TiO 2 decorated SiO 2 nanoparticles can be useful for the mitigation of pollutants from water bodies which we have reported elsewhere. [62] Further work may be carried out to test the activity on other strains of microbes and their ability to restrict biofilm formation.…”

Section: Discussionmentioning

confidence: 99%

TiO₂ Decorated SiO₂ Nanoparticles as Efficient Antibacterial Materials: Enhanced Activity under Low Power UV Light

2023

Self Cite

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TiO 2 based photocatalytic materials show effective antibacterial activity typically under a high-power UV light. However, exposure to high-intensity radiation may be detrimental to biological as well as non-biological materials. In this work, we demonstrate a significantly higher antibacterial activity at even low power UV where TiO 2 nanoparticles are decorated on silica nanoparticles. The antibacterial activity of the nanoparticles with varying Si : Ti molar compositions were explored against E. coli to obtain effective antibacterial activity with minimal power of UV radiation (8 W). The nanoparticles with a molar ratio of SiO 2 : TiO 2 = 2 : 1 (Si2Ti) showed the best antibacterial activity. The minimum inhibitory concentration (MIC) of the Si2Ti catalyst was also determined for varying duration of exposure to 8 W UV radiation. Even at a very low concentration of 5 mg/ mL Si2Ti sample, where the active catalyst amount was only 1.66 mg/mL, 100 % killing of E. coli was observed after 90 minutes of UV exposure. For the exposure time of 120 minutes, MIC was reduced even further to 3 mg/mL with an active catalyst amount of 1 mg/mL. The excellent antibacterial activity is attributed to the small crystallite size of TiO 2 along with enhanced interaction with bacteria owing to the presence of SiO 2 . In addition, Si2Ti showed good biocompatibility with more than 87 % cell viability with fibroblast cells for 500 μg/mL of the sample.

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TiO2@SiO2 nanoparticles for methylene blue removal and photocatalytic degradation under natural sunlight and low-power UV light

Cited by 84 publications

References 37 publications

Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Block Copolymer and Cellulose Templated Mesoporous TiO2-SiO2 Nanocomposite as Superior Photocatalyst

TiO₂ Decorated SiO₂ Nanoparticles as Efficient Antibacterial Materials: Enhanced Activity under Low Power UV Light

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TiO2@SiO2 nanoparticles for methylene blue removal and photocatalytic degradation under natural sunlight and low-power UV light

Cited by 84 publications

References 37 publications

Synthesis and Applications of Green Synthesized TiO2 Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Synthesis and Applications of Green Synthesized TiO2 Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Block Copolymer and Cellulose Templated Mesoporous TiO2-SiO2 Nanocomposite as Superior Photocatalyst

TiO2 Decorated SiO2 Nanoparticles as Efficient Antibacterial Materials: Enhanced Activity under Low Power UV Light

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Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

Synthesis and Applications of Green Synthesized TiO₂ Nanoparticles for Photocatalytic Dye Degradation and Antibacterial Activity

TiO₂ Decorated SiO₂ Nanoparticles as Efficient Antibacterial Materials: Enhanced Activity under Low Power UV Light