EVALUATION OF THE PHOTOCATALYTIC ACTIVITY OF SiO2@TiO2 HYBRID SPHERES IN THE DEGRADATION OF METHYLENE BLUE AND HYDROXYLATION OF BENZENE: KINETIC AND MECHANISTIC STUDY

Salgado, Bruno César Barroso; Valentini, Antoninho

doi:10.1590/0104-6632.20190364s20190139

Cited by 25 publications

(16 citation statements)

References 61 publications

(81 reference statements)

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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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“…6. 67) The red circles are the data from a study by Stefanska et al of samples with a TiO 2 content of 44 % prepared via an emulsion route 68) and the green diamonds are the data from a study by Ekka et al of samples prepared via an encapsulation method. 69) The blue stars are the data from a study by Zhang et al of pure SiO 2 NPs with 0 % TiO 2 content prepared via the Stöber method.…”

Section: Solid Aciditymentioning

confidence: 99%

Functionalities and modification of sol–gel derived SiO<sub>2</sub>–TiO<sub>2</sub> systems for advanced coatings and powders

Matsuda

2022

J. Ceram. Soc. Japan

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In this review, a comprehensive overview is given that covers the preparation, characterization, properties, and modification of solgel derived SiO 2 TiO 2 systems toward the generation of advanced coatings and powders with desirable properties. First, the fundamentals of the preparation and application of solgel derived multicomponent oxide coatings and powders are reviewed. Then, the basic physical and chemical properties of solgel derived SiO 2 TiO 2 coatings and powders are described. After that, the morphological and structural modification of solgel derived SiO 2 TiO 2 systems using organic polymers and surfactants, via their reaction in water vapor and hot water under external fields, are discussed. Finally, the advanced functionalities, such as superhydrophilicity, photocatalytic activity, micropatterning, and holographic recording, of the solgel derived SiO 2 TiO 2 coatings are demonstrated. In this context, the contributions of the author in this research field are also presented.

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“…At the same time, the photogenerated holes (h + ) with strong oxidation ability could react with H 2 O to produce radical hydroxyl (•OH). The generated species can degrade the MB and other organic complex dyes [28].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Application of Titanium-Silica-Graphite Composite Material for Photocatalytic Process of Methylene Blue

Destiarti

Sasri

2020

Indones. J. Chem.

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The use of TiO2 in the slurry system for the photocatalytic process has disadvantages. It causes the resistance of UV transmission because it is cloudy and the difficulty for obtaining the catalyst at the end of the process. Therefore, an attempt to overcome this was conducted by compositing TiO2 on SiO2. Furthermore, carbon material can be used as a support material for TiO2-SiO2, so that the mixed materials can be used as a photocatalyst. The methods for synthesis the material was a sol-gel method by varying the composition of TiO2-SiO2/graphite, which was 1:1; 1:2; and 2:1. The material obtained was characterized by FTIR, DRUV, XRD, and SEM. Photocatalytic activity of the synthesized material was tested in methylene blue solution whereas the quantitative data derived from UV-Vis spectrometry measurement. Photocatalyst activity was carried out by varying the degradation time of 30–180 min. The FTIR spectrum showed that O-H (~3400 cm–1) and C-O (~1100 cm–1) are the major groups in the synthesized materials. The value of bandgap energy (Eg) were 4.15, 4.20, 5.22, and 5.19 eV for TiO2-SiO2, TiO2-SiO2/G (1:1; 1:2; and 2:1) composites, respectively. The XRD pattern of TiO2-SiO2 showed that the highest peaks of 2q were observed at 25.32, 37.71 and 47.91°. Graphite identity appeared at 2q = 59.87°. Micrograph of SEM showed a homogenous dispersion of spherical particles in the materials. Photocatalytic test results showed that TiO2-SiO2/G with a composition of 2:1 has the highest percentage of methylene blue degradation, which reached 94% at 180 min.

show abstract

EVALUATION OF THE PHOTOCATALYTIC ACTIVITY OF SiO2@TiO2 HYBRID SPHERES IN THE DEGRADATION OF METHYLENE BLUE AND HYDROXYLATION OF BENZENE: KINETIC AND MECHANISTIC STUDY

Cited by 25 publications

References 61 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

Functionalities and modification of sol–gel derived SiO<sub>2</sub>–TiO<sub>2</sub> systems for advanced coatings and powders

Application of Titanium-Silica-Graphite Composite Material for Photocatalytic Process of Methylene Blue

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