The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO2@α-Fe2O3 nanocomposites

Uma, Kasimayan; Chen, Shih-Wen; Arjun, Nadarajan; Pan, Guan‐Ting; Yang, Thomas C.-K.

doi:10.1039/c7ra13260c

Cited by 11 publications

(4 citation statements)

References 63 publications

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“…Salvadora persica wood contains tannins, sulfur compounds, isothiocyanate compounds, sangrin, chlorine, silica, silicon, and sodium chloride bicarbonate. [28] Our other research reported the successful synthesis of CeO 2 , [29] ZnO, [30] α-Fe 2 O 3 , [31] Cd-doped CeO 2 , [32] Ni-doped CeO 2 , [33] and Ag-doped ZnO [34] nanoparticles through the exertion of this plant extract. This paper introduces the application of a one-step route for the direct synthesis of α-Fe 2 O 3 @Ag and Fe 3 O 4 @Ag core-shell nanoparticles by employing the aqueous extract of Salvadora persica bark, with the aim of offering a simple and fast synthesizing process that does not require any high-temperature treatment for attaining the desired resultants.…”

Section: Introductionmentioning

confidence: 86%

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

et al. 2023

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This work provides the synthetic route for the arrangement of Fe 3 O 4 @Ag and α-Fe 2 O 3 @Ag core-shell nanoparticles (NPs) with cytotoxic capabilities. The production of Fe 3 O 4 @Ag and α-Fe 2 O 3 @Ag core-shell NPs was facilitated utilizing S. persica bark extracts. The results of Powder X-ray Diffraction (PXRD), Ultraviolet-visible (UV-Vis) spectroscopy, Vibrating Sample Magnetometry (VSM), Energy Dispersive X-ray (EDX) analysis, Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM) supported the green synthesis and characterization of Fe 3 O 4 @Ag and α-Fe 2 O 3 @Ag NPs. The particle size was measured by the TEM analysis to be about 30 and 50 nm, respectively; while the results of FESEM showed that α-Fe 2 O 3 @Ag and Fe 3 O 4 @Ag particles contained multi-faceted particles with a size of 50-60 nm and 20-25 nm, respectively. The outcomes of VSM were indicative of a saturation magnetization of 37 and 0.18 emu/g at room temperature, respectively. The potential cytotoxicity of the synthesized core-shell nanoparticles towards breast cancer (MCF-7) and human umbilical vein endothelial (HUVEC) cells was evaluated by an MTT assay. α-Fe 2 O 3 @Ag NPs were able to destroy 100 % of MCF-7 cell at doses above 80 μg/mL, and it was confirmed that Fe 3 O 4 @Ag NPs at a volume of 160 μg/mL can destroy 90 % of MCF-7 cells. Thus, the applicability of the prepared nanoparticles of these nanoparticles in biological and medical fields has been demonstrated.

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Section: Introductionmentioning

confidence: 86%

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

et al. 2023

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“…For the preparation of the nanocomposites, SiO 2 nanospheres were first prepared as per our previous work [10]. The SiO 2 spheres were synthesized from a mixture of tetraethyl orthosilicate (TEOS), anhydrous ethanol, and water, which was stirred at room temperature for 15 min.…”

Section: Methodsmentioning

confidence: 99%

“…In particular, these metal oxides have shown greater stability and sensitivity, especially for the degradation of organic pollutants [6]. Among the various metal oxides, ZnO and α-Fe 2 O 3 are the best combination for the production of the heterogeneous photocatalysts used for wastewater treatment [7], CO 2 reduction [8], hydrogen production [9], CO oxidation [10], and water splitting [9,11]. The heterogeneous semiconductors can also be utilized to trap electrons at surface sites and to support the formation of superoxide anion radicals O 2 − from O 2 molecules.…”

Section: Introductionmentioning

confidence: 99%

Assembly of ZnO Nanoparticles on SiO2@α-Fe2O3 Nanocomposites for an Efficient Photo-Fenton Reaction

et al. 2018

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The SiO2@α-Fe2O3/ZnO metal oxide nanocomposites employed in this study were obtained using the sol-gel method. Their photocatalytic activities were enhanced by photo-Fenton reactions. The metal oxide composite of ZnO and α-Fe2O3 nanoparticles were deposited on the SiO2 nanospheres intended for visible light photocatalysis. Further, the as-synthesized SiO2@α-Fe2O3/ZnO nanocomposites exhibited a robust crystallinity and a high adsorption of dye molecules when compared to SiO2@ZnO and SiO2@α-Fe2O3 nanocomposites, respectively. The experimental results demonstrated a rapid Methylene Blue (MB) degradation among these catalysts within short intervals of time with the addition of α-Fe2O3/ZnO mixed metal oxide catalysts on the SiO2 nanospheres. Finally, a photo-Fenton reaction was implemented to confirm the presence of the hydroxyl (OH) radicals, which are powerful agents used for the degradation of organic pollutants.

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“…12,33,[39][40][41][42] Several studies published in recent years have demonstrated that Mn, Al, Cu, Fe, Pt, and Au-doped/embedded graphene catalysts have higher catalytic activity for the NH 3 decomposition process, as well as the other electrochemical reactions. [43][44][45][46][47] Considering the strong relationship between metal nanoparticles and support material interactions, many metal-supported hybrid combinations should be studied and theoretically predicted.…”

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confidence: 99%

Theoretical Insights into the NH₃Decomposition Mechanism on the Cu- and Pt- Embedded Graphene Surfaces: A DFT Approach

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et al. 2021

ECS J. Solid State Sci. Technol.

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Herein, the catalytic activities of Cu-and Pt-embedded graphene surfaces on the sequential decomposition reaction of NH 3 molecule were investigated by density functional theory (DFT). Partial charge changes on the surfaces by embedding Cu and Pt atoms on the bare graphene surface were analyzed by the Bader charge analysis and depicted by the electron density difference maps. Grimme-D2 dispersion correction was employed for weak interactions between adsorbates and both graphene surfaces. The most stable geometries of the adsorption of NH x (x = 0 → 3) and H species and their fragmented co-adsorption structures on both graphene surfaces were obtained. The internal energy barrier calculations required for the sequential decomposition of NH 3 on both graphene surfaces were calculated by the CINEB method and the results obtained for complete decomposition of NH 3 were illustrated by relative energy diagram. The findings revealed that the decomposition of NH 3 to NH 2 , NH, and N on the Cuembedded graphene surface had relatively lower activation barriers of 1.52 eV, 0.72 eV, and 0.64 eV, respectively, compared to the Pt-embedded graphene surface. The Cu-embedded graphene surface was of high selectivity over the NH 3 sequential decomposition reaction. This information may paw the way for different strategies for the development of Cu-based catalysts for NH 3 decomposition.

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The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO₂@α-Fe₂O₃ nanocomposites

Cited by 11 publications

References 63 publications

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

Assembly of ZnO Nanoparticles on SiO2@α-Fe2O3 Nanocomposites for an Efficient Photo-Fenton Reaction

Theoretical Insights into the NH₃Decomposition Mechanism on the Cu- and Pt- Embedded Graphene Surfaces: A DFT Approach

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The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO2@α-Fe2O3 nanocomposites

Cited by 11 publications

References 63 publications

α‐Fe2O3@Ag and Fe3O4@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

α‐Fe2O3@Ag and Fe3O4@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

Assembly of ZnO Nanoparticles on SiO2@α-Fe2O3 Nanocomposites for an Efficient Photo-Fenton Reaction

Theoretical Insights into the NH3Decomposition Mechanism on the Cu- and Pt- Embedded Graphene Surfaces: A DFT Approach

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The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO₂@α-Fe₂O₃ nanocomposites

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

α‐Fe₂O₃@Ag and Fe₃O₄@Ag Core‐Shell Nanoparticles: Green Synthesis, Magnetic Properties and Cytotoxic Performance

Theoretical Insights into the NH₃Decomposition Mechanism on the Cu- and Pt- Embedded Graphene Surfaces: A DFT Approach