Colloidal titania-silica-iron oxide nanocomposites and the effect from silica thickness on the photocatalytic and bactericidal activities

Chanhom, Padtaraporn; Charoenlap, Nisanart; Tomapatanaget, Boosayarat; Insin, Numpon

doi:10.1016/j.jmmm.2016.10.123

Cited by 19 publications

(16 citation statements)

References 31 publications

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“…The part that does not interact with Ti is due to the minimal amount of Ti dispersed on the surface so nothing center electrostatic force to direct the hexagonal structure but Ti attraction only causes elongation and enlargement of the size of the silica on various surfaces . The result on the absence of interaction stimulants is stable spherical silica shape due to as previous research explnataion [29][30][31].…”

Section: Resultsmentioning

confidence: 62%

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Ulfa,

Anggreani,

Mulyani

et al. 2024

Bull. Chem. React. Eng. Catal.

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Hexagonal TiO2/SiO2 Porous Microplates have been successfully synthesized by incorporation of Ti precursors into SiO2 synthesized from Si precursors in a gelatin-CTAB mixture via the hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), EDX, nitrogen adsorption-desorption and Fourier transform infrared spectroscopy (FTIR). The sample has a surface area of 735 m2/g, pore volume of 0.67 cc/g, and pore diameter of 3.2 nm, according to the results of the characterization of hexagonal TiO2/SiO2 porous microplates. The transformation of SiO2 microspheres into hexagonal TiO2/SiO2 porous microplates is revealed by a microparticle size increase of 84% and the transition of Si−O bonds into Ti−O and Si−O as measured by FTIR. The photocatalytic activity of hexagonal TiO2/SiO2 porous microplates resulted in 81.15% photodegradation of methylene blue under UV light irradiation within 60 min, which was 21 % better than SiO2. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: Resultsmentioning

confidence: 62%

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Ulfa,

Anggreani,

Mulyani

et al. 2024

Bull. Chem. React. Eng. Catal.

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“…Numerous reasons have been provided as to why any one of these coatings is to be used, but why both are to be used is not readily clear and all that this review has done is broadened the scope of this question and provided bases for its future explorations, without answering it. Even though studies have shown that the silica mesolayer exerts a definite effect on the physicochemical and biological properties on the whole particle, both in earthicle , and other composite particle systems, − the use of both components seemingly breaches the principle of Occam’s razor and makes the composition partially redundant. For example, carbon can be covalently functionalized with organic molecules, but so can silica; carbon protects the iron core from oxidation and other forms of degradation, but so does silica to some extent; silica can be made mesoporous, but so can be carbon, albeit with a little more effort; and so on.…”

Section: Discussionmentioning

confidence: 99%

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Uskoković

2020

ACS Earth Space Chem.

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Earthicle was conceived as an astromimetic particle mimicking the stratified structure of Earth. Although earthicle can come in various compositional and structural forms, its seminal version consisted of a spherical nanoparticle with an iron core, a silica shell, and a carbon crust. This study provides a historical review of composite, core/shell particles composed of four different combinations of phases present in this original version of the earthicle, three of which are biphasic and one of which is triphasic: iron(oxide)/silica, iron(oxide)/carbon, silica/carbon, and iron(oxide)/silica/carbon. The connection of all four types of particles to materials of astrophysical origin found in interstellar and interplanetary space is discussed. The referred studies on the three biphasic compositions were selected on the basis of their conceptual and methodological innovativeness or originality in terms of the analytical data. In contrast, all studies that have reported so far on the synthesis, characterization, or application of the hybrid particles with the triphasic composition, along with a number of related studies, are reviewed. The chronological perspective adopted for both types of hybrid compositions, biphasic and triphasic, allowed for the deduction of past and present trends in the research of these composite systems but also for the extrapolation of probable future trends. For example, the interest in silica-coated iron (oxides) has been greater than that in other three core/shell systems, especially in biomedical studies, one reason being the difference in reactivity and in the favored oxidation state of the magnetic core under silica and under carbon. The early focus of research on silica-coated iron (oxides) was mostly on controlling the synthesis process, but as of the early 2000s the interest in controlling the properties and devising new applications for these systems became dominant among the scientific community. Carbon-coated silica particles have been the least studied and have had the least impact among the three biphasic combinations reviewed, especially in the biomedical field where their research has been virtually none. Revived briefly around 2010, the interest in them wound down soon thereafter in favor of more complex compositions. Still, the most complex hybrid composition reviewed here, comprising iron (oxide) particles shelled doubly, first with silica and then with carbon, was the least studied of all four multiphasic compositions elaborated here. However, unlike the ups and downs in the research on the biphasic compositions in the particulate form, the corresponding interest in these triphasic particles has been continually increasing, in spite of the comparatively low number of literature reports on them. This promising trend emerging from the literature search may go hand-in-hand with the ongoing global tendency to fabricate complex composite particle structures in search of novel properties arising from the sometimes theoretically predictable and sometimes serendipitous synergies be...

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“…SiO 2 –TiO 2 -based nanocomposites have been reported for the removal of methyl orange, methylene blue, and Staphylococcus aureus (S. aureus). − In previous reports of our lab, core–shell nanocomposites of SiO 2 with MgFe 2 O 4 , Fe 2 O 3 , and Sr 0.4 Ti 0.6 Fe 2 O 4.6 have been documented as adsorbents and photocatalysts. − SiO 2 thickness is an important parameter that can alter the photocatalytic properties of core–shell nanocomposites. In this article, for the first time, we have studied the effect of SiO 2 thickness on the photocatalytic and antibacterial activity of Ti 4+ - and Mg 2+ -substituted strontium ferrite (Sr 0.4 Ti 0.4 Mg 0.2 Fe 2 O 4.4 ).…”

Section: Introductionmentioning

confidence: 99%

Precise Tuning of SiO₂ Thickness in SiO₂@Sr_0.4Ti_0.4Mg_0.2Fe₂O_4.4 Core–Shell Nanocomposites for Augmenting Photocatalytic and Antibacterial Activity

Kaur,

Vyas

2023

ACS Sustainable Chem. Eng.

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Core–shell heterostructures have attracted great concern as promising visible light-driven photocatalysts. Herein, core–shell nanocomposites of SiO2@Sr0.4Ti0.4Mg0.2Fe2O4.4 with varying SiO2 thickness were rationally designed. Effect of modulating the SiO2 thickness on the structural and optical properties was studied. Homogenous SiO2 layer of varying thickness was coated over Sr0.4Ti0.4Mg0.2Fe2O4.4 NPs. HRTEM and XRD analyses confirmed the successful formation of core–shell nanocomposites. The photocatalytic performance was evaluated by using tetracycline hydrochloride, azure-B, Staphylococcus aureus, and Escherichia coli as model pollutants. Maximum enhancement in photocatalytic activity was observed in a core–shell nanocomposite having an average shell thickness of 24 nm. The results were supported by its higher porosity and specific surface area, along with a narrowed band gap and fluorescence quenching. The formation of the core–shell heterojunction promoted charge separation. Under the optimized conditions of irradiation time, pH, and dose, its degradation efficiency was 96.5% for tetracycline hydrochloride, 96.3% for azure-B, 97.1% for S. aureus, and 95.4% for E. coli. Hydroxyl radicals and holes played a vital role in the degradation process. The photocatalytic parameters were optimized using Box–Behnken statistical methodology. This work bears broad potential for fabricating an efficient and high-performance photocatalyst of SiO2 with ferrite having a core–shell heterostructure.

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Colloidal titania-silica-iron oxide nanocomposites and the effect from silica thickness on the photocatalytic and bactericidal activities

Cited by 19 publications

References 31 publications

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Precise Tuning of SiO₂ Thickness in SiO₂@Sr_0.4Ti_0.4Mg_0.2Fe₂O_4.4 Core–Shell Nanocomposites for Augmenting Photocatalytic and Antibacterial Activity

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Colloidal titania-silica-iron oxide nanocomposites and the effect from silica thickness on the photocatalytic and bactericidal activities

Cited by 19 publications

References 31 publications

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Precise Tuning of SiO2 Thickness in SiO2@Sr0.4Ti0.4Mg0.2Fe2O4.4 Core–Shell Nanocomposites for Augmenting Photocatalytic and Antibacterial Activity

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Precise Tuning of SiO₂ Thickness in SiO₂@Sr_0.4Ti_0.4Mg_0.2Fe₂O_4.4 Core–Shell Nanocomposites for Augmenting Photocatalytic and Antibacterial Activity