Effects and mechanism of SiO<sub>2</sub> on photocatalysis and super hydrophilicity of TiO<sub>2</sub> films prepared by sol-gel method

Sun, Rongji; Chen, Zhili; Yang, Yi; Peng, Jintang; Zheng, Taojie

doi:10.1088/2053-1591/aafa8c

Cited by 20 publications

(11 citation statements)

References 37 publications

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“…Activation of water (

) and molecular oxygen (

) are the most important chemical processes involved in both photocatalytic and biocide activities, and the ROS are the key signaling molecules in both processes. As demonstrated by the results of the radical scavenger experiments, SiO 2 interacts with

and

to provoke the formation of ROS (

and

) [ 120 , 121 , 122 , 123 ] and is effective in inhibiting protein adhesion [ 124 , 125 ].…”

Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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COVID-19, as the cause of a global pandemic, has resulted in lockdowns all over the world since early 2020. Both theoretical and experimental efforts are being made to find an effective treatment to suppress the virus, constituting the forefront of current global safety concerns and a significant burden on global economies. The development of innovative materials able to prevent the transmission, spread, and entry of COVID-19 pathogens into the human body is currently in the spotlight. The synthesis of these materials is, therefore, gaining momentum, as methods providing nontoxic and environmentally friendly procedures are in high demand. Here, a highly virucidal material constructed from SiO2-Ag composite immobilized in a polymeric matrix (ethyl vinyl acetate) is presented. The experimental results indicated that the as-fabricated samples exhibited high antibacterial activity towards Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as well as towards SARS-CoV-2. Based on the present results and radical scavenger experiments, we propose a possible mechanism to explain the enhancement of the biocidal activity. In the presence of O2 and H2O, the plasmon-assisted surface mechanism is the major reaction channel generating reactive oxygen species (ROS). We believe that the present strategy based on the plasmonic effect would be a significant contribution to the design and preparation of efficient biocidal materials. This fundamental research is a precedent for the design and application of adequate technology to the next-generation of antiviral surfaces to combat SARS-CoV-2.

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“…Activation of water (

) and molecular oxygen (

and

to provoke the formation of ROS (

and

) [ 120 , 121 , 122 , 123 ] and is effective in inhibiting protein adhesion [ 124 , 125 ].…”

Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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“…Titanium (III) oxide, being a narrow band-gap semiconductor, has its energy level located between the conduction band and the valence band of TiO 2 [36]; it is therefore expected that electrons may be excited to the energy level of Ti 2 O 3 from the valence band of TiO 2 or to the conduction band of TiO 2 from the energy level of Ti 2 O 3 with visible light [37]. Although its presence could not be detected from either XRD or XPS, mixed Ti-Si oxides could also be formed in amounts lower than the detection limit of both these methods, which could also lead to a significant decrease in the energy band gap, synergic with the titanium silicides, and a more-efficient visible light harvesting in photocatalysis applications [38,39].…”

Section: Resultsmentioning

confidence: 99%

Visible Domain Photocatalysis Performance of Ti-Si Thermal-Sprayed Coatings

et al. 2021

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Cost and performance-effective materials used in advanced oxidation processes such as photocatalysis have obtained widespread attention in recent years. In this study, thermal spraying was used as a one-step method to obtain thick visible-light-active photocatalyst coatings on two types of substrates, namely, plain carbon steel and copper. A mixed metallic titanium–silicon powder bearing 10% wt. Si was used as feedstock. The optical bandgaps of the coatings were close to 1.000 eV, allowing good photodecoloration efficiencies (>89%) and mineralization efficiencies (>67%) for methylene blue dye from aqueous solutions under visible light irradiation. The photodegradation process could be successfully modelled by the Langmuir–Hinshelwood pseudo-first-order kinetic model, with reaction rate constants k between 0.16 and 1.06 h−1.

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“…The mesoporous TiO 2 lms were rst grown on Si(100) substrates, however SiO 2 is known to be a better substrate for the carriers' separation, which potentially increases the photocatalytic efficiently. 47,48 Therefore, we also performed the TiO 2 deposition on 40 nm thermally oxidised SiO 2 (Si/SiO 2 ) substrates, using only the short purge time regime (5 s). The structural and morphological characterisations of these samples were similar to the ones deposited on Si substrates with a native SiO 2 layer (Fig.…”

Section: Photocatalytic Properties Of Mesoporous Tio 2 Lmsmentioning

confidence: 99%

Mesoporous TiO₂ anatase films for enhanced photocatalytic activity under UV and visible light

et al. 2020

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Effects and mechanism of SiO₂ on photocatalysis and super hydrophilicity of TiO₂ films prepared by sol-gel method

Cited by 20 publications

References 37 publications

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Visible Domain Photocatalysis Performance of Ti-Si Thermal-Sprayed Coatings

Mesoporous TiO₂ anatase films for enhanced photocatalytic activity under UV and visible light

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Effects and mechanism of SiO2 on photocatalysis and super hydrophilicity of TiO2 films prepared by sol-gel method

Cited by 20 publications

References 37 publications

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Visible Domain Photocatalysis Performance of Ti-Si Thermal-Sprayed Coatings

Mesoporous TiO2 anatase films for enhanced photocatalytic activity under UV and visible light

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Effects and mechanism of SiO₂ on photocatalysis and super hydrophilicity of TiO₂ films prepared by sol-gel method

Mesoporous TiO₂ anatase films for enhanced photocatalytic activity under UV and visible light