Synthesis and characterization of ZrO2@SiO2 core-shell nanostructure as nanocatalyst: Application for environmental remediation of rhodamine B dye aqueous solution

Padovini, David Santos Souza; Magdalena, Aroldo Geraldo; Capeli, R.G.; Longo, Elson; Dalmaschio, Cleocir José; Chiquito, A. J.

doi:10.1016/j.matchemphys.2019.05.024

Cited by 33 publications

(15 citation statements)

References 47 publications

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“…The peaks at 821 and 723cm -1 were attributed to Si-O and Si-O-Zr stretching, respectively, in agreement with the findings reported by Li et al (2007), who obtained thin zirconia films prepared on Si (100) substrates by plasma-assisted cathodic arc deposition under different processing conditions. These results are corroborated by the study carried out by Padovini et al (2019), who reported (Zr-O) bonds between 800 and 400 cm -1 .…”

Section: Resultssupporting

confidence: 82%

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Araújo

Macêdo

Pedrosa

et al. 2022

RSD

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There are few works in the literature regarding the study and development of new bioceramic compounds for ophthalmologic applications, especially considering the use of advanced laboratory technologies such as the sol-gel process, which presents the possibility of controlling various parameters as namely temperature, stoichiometry and alkalinity. In this regard, the present work synthesized alumina-based bioceramic compounds in combination with silica and zirconia via the sol-gel process, having evaluated the possibility/viability of these biomaterials for orbital reconstruction. The materials were characterized by X-Ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The results show the formation of different structures, with the tendency to form alpha alumina, silica in the form of orthorhombic mullite and zirconia in its monoclinic and tetragonal phases, demonstrated by the characteristic reaction bonds between the precursors, as observed in the FTIR assay. The morphological characterization highlighted that the most determining factor which influences agglomerate size is temperature, followed by silica concentration. These results are relevant for ophthalmological applications, considering the intrinsic properties of each oxide.

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Section: Resultssupporting

confidence: 82%

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Araújo

Macêdo

Pedrosa

et al. 2022

RSD

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“…For example, Yang et al changed the concentration of tetraethyl orthosilicate (TEOS) to obtain ZrO 2 @SiO 2 nanoparticles with a SiO 2 shell having controllable thickness, and the resultant nanoparticles possessed an adjustable refractive index . Padovini et al prepared ZrO 2 @SiO 2 nanoparticles using a mild two-step method, and the ZrO 2 @SiO 2 nanoparticles had higher photocatalytic activity than pure ZrO 2 and SiO 2 , showing important application in sewage treatment . To the best of our knowledge, their application in dental materials is still scarce, as reports on the influence of surface treatments of ZrO 2 nanoparticles on the physical and mechanical properties of DRCs.…”

Section: Introductionmentioning

confidence: 99%

“…13 Padovini et al prepared ZrO 2 @SiO 2 nanoparticles using a mild two-step method, and the ZrO 2 @SiO 2 nanoparticles had higher photocatalytic activity than pure ZrO 2 and SiO 2 , showing important application in sewage treatment. 14 To the best of our knowledge, their application in dental materials is still scarce, as reports on the influence of surface treatments of ZrO 2 nanoparticles on the physical and mechanical properties of DRCs. In this study, ZrO 2 nanoparticles were first coated with mesoporous SiO 2 through a mild sol−gel technique and then modified with 3-methacryloxypropyltrimethoxysilane (γ-MPS), a common coupling agent used in dentistry.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of ZrO₂ Nanoparticles and Its Effects on the Properties of Dental Resin Composites

Wang

Hua

et al. 2020

ACS Appl. Bio Mater.

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Endowing dental resin composites (DRCs) with suitable radiopacity is necessary for clinical diagnosis during treatment of caries. To reach this effect, ZrO 2 nanoparticles were introduced into the DRCs in this work after modification with two different methods, one modified with 3-methacryloxypropyltrimethoxysilane (ZrO 2 @γ-MPS) and the other coated with mesoporous SiO 2 and then modified with γ-MPS (ZrO 2 @m-SiO 2 @γ-MPS). These ZrO 2 nanoparticles were used as functional additives, and the SiO 2 nanoparticles were used as the fundamental filler in the preparation of DRCs to study the effects of the surface modification of ZrO 2 nanoparticles and the amount of particles added (0, 3, 5, and 7 wt %) on the properties of the DRCs. The DRC containing ZrO 2 @m-SiO 2 @γ-MPS showed a higher transmittance, which may be attributed to the fact that the SiO 2 coating reduced the refractive index of the nanoparticles and thus decreased the scattering of light within the DRC. The silane polymer film on the surface of ZrO 2 @γ-MPS nanoparticles acted as a lubricant and decreased the viscosity of DRC, but the DRC containing ZrO 2 @m-SiO 2 @γ-MPS showed a higher viscosity due to the presence of a mesoporous structure. The radiopacity value of the DRCs containing the functional additives was close to 1 mm Al, much higher than that of the DRC filled with SiO 2 nanoparticles alone (0.74 ± 0.07 mm Al), meeting the requirement of ISO 4049:2009. The surface modification of ZrO 2 nanoparticles had no significant influence on the mechanical properties, radiopacity, and cytotoxicity of DRCs (p > 0.05). This study provides useful insight into the design and development of radiopaque DRCs with excellent physical and mechanical properties.

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“…Combining SiO 2 and ZrO 2 can result in SiO 2 –ZrO 2 mixed oxides with increased surface areas, and also form Si–O–Zr bridge bonds as well as new acid sites, especially Brønsted acid sites. The previous literature mainly focuses on the structure–property relationship of SiO 2 –ZrO 2 mixed oxides in photocatalysis, CO methanation, dehydrogenation, deoxidation, etc. To the best of our knowledge, the application of SiO 2 –ZrO 2 mixed oxides in hydrocracking reactions has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Slurry-Phase Hydrocracking of a Decalin–Phenanthrene Mixture by MoS₂/SiO₂–ZrO₂ Bifunctional Catalysts

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Slurry-phase hydrocracking is one of the most advanced technologies for the conversion of inferior heavy oil to light fuel oil. In this work, MoS2 was combined with SiO2–ZrO2 mixed oxides to offer a new class of bifunctional catalysts for slurry-phase hydrocracking. In the bifunctional catalysts, SiO2–ZrO2 mixed oxides with abundant mesopores and acid sites act as cracking catalysts. They were presynthesized by a sol–gel-hydrothermal method and systematically characterized by X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programed desorption (NH3-TPD), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The effect of Si/Zr molar ratios on the chemical structure, especially the acid properties of SiO2–ZrO2 mixed oxides were examined. Subsequently, a mixture of decalin–phenanthrene was selected as the model system to investigate the performance of bifunctional catalysts. It was found that the conversions of decalin and phenanthrene were significantly improved for MoS2/SiO2–ZrO2 bifunctional catalysts. Further analysis indicated that the Brønsted acid sites of SiO2–ZrO2 mixed oxides played an important role in the improvement of decalin and phenanthrene conversions.

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Synthesis and characterization of ZrO2@SiO2 core-shell nanostructure as nanocatalyst: Application for environmental remediation of rhodamine B dye aqueous solution

Cited by 33 publications

References 47 publications

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Surface Modification of ZrO₂ Nanoparticles and Its Effects on the Properties of Dental Resin Composites

Slurry-Phase Hydrocracking of a Decalin–Phenanthrene Mixture by MoS₂/SiO₂–ZrO₂ Bifunctional Catalysts

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Synthesis and characterization of ZrO2@SiO2 core-shell nanostructure as nanocatalyst: Application for environmental remediation of rhodamine B dye aqueous solution

Cited by 33 publications

References 47 publications

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Evaluation of Al2O3-SiO2-ZrO2-based ceramic compounds synthesized via sol-gel

Surface Modification of ZrO2 Nanoparticles and Its Effects on the Properties of Dental Resin Composites

Slurry-Phase Hydrocracking of a Decalin–Phenanthrene Mixture by MoS2/SiO2–ZrO2 Bifunctional Catalysts

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Product

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Surface Modification of ZrO₂ Nanoparticles and Its Effects on the Properties of Dental Resin Composites

Slurry-Phase Hydrocracking of a Decalin–Phenanthrene Mixture by MoS₂/SiO₂–ZrO₂ Bifunctional Catalysts