One-pot, green and surfactant-less synthesis of polyhedral PdNPs anchored on GO as superior catalyst for reduction of 4-nitrophenol

Tran, Nhung Thi; Nguyen, Tuan Loi; Nguyen, Huong; Tu, Thach N.; Hoang, Van Chinh

doi:10.1016/j.synthmet.2021.116957

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…As shown in Figure a–e, the hydrogenation activity toward 4-NP on Pd crystal facets decreased in the order { hk0 } > {100} > {111} and Pd@mSiO 2 particles with yolk–shell structures exhibited a significantly enhanced catalytic performance as compared to the core–shell and partial-coated particles, while the catalytic activity on Pd@mSiO 2 PCNPs was slightly above that on Pd@mSiO 2 CSNPs. The linear relationship between ln ( C t / C 0 ) and reaction time for the hydrogenation of 4-NP over the studied Pd catalysts confirmed the pseudo-first-order kinetics (Figure S24), which was in agreement with the catalytic reduction of 4-NP over Pd/Fe 3 O 4 @C, Pd-loaded graphene oxide (GO) nanocomposites, and Pd–ZnO nanowire arrays. − For Pd nanocrystals with different exposed facets, over 50% of 4-NP could be reduced within 4 min, while complete conversion was achieved in 10, 11, and 6 min for Pd NCs, Pd NOs, and Pd CNs, respectively (Figure a). The hydrogenation activity of Pd CNs with { hk0 } facets ( k app = 4.86 × 10 –3 s –1 ) was significantly higher than that of Pd NCs ( k app = 3.66 × 10 –3 s –1 ) and Pd NOs ( k app = 3.44 × 10 –3 s –1 ), which exposed the {100} and {111} facets, respectively (Figure e).…”

Section: Resultssupporting

confidence: 84%

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Wang,

Zhang,

Zhang

et al. 2023

Inorg. Chem.

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Tuning the surface chemical property and the local environment of nanocrystals is crucial for realizing a high catalytic performance in various reactions. Herein, we aim to elucidate the structure sensitivity of Pd facets on the surface catalytic hydrogenation reaction and to identify what role the nanoconfinement effect plays in the catalytic properties of Pd nanocrystal catalysts. By controlling the coating structures of mesoporous silica (mSiO 2 ) on Pd nanocrystals with different exposed facets that include {100}, {111}, and {hk0}, we present a series of Pd@mSiO 2 nanoreactors in core−shell and yolk−shell structures and the discovery of a partial-coated structure, which can provide different types of nanoconfinement, and we propose a seed size-dominated growth mechanism. We demonstrate that a superior activity was exhibited in Pd nanocrystals enclosed by the {hk0} facet as compared to the Pd{100} and Pd{111} facets, and substantially enhanced efficiency and stability were achieved in Pd@mSiO 2 particles with yolk−shell structures, indicating a crucial superiority of optimizing the configuration of crystal facets and nanoconfinement. Our study provides an efficient strategy to rationally design and optimize nanocatalysts for promoting catalytic performance.

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Section: Resultssupporting

confidence: 84%

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Wang,

Zhang,

Zhang

et al. 2023

Inorg. Chem.

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Investigating the Antibacterial Activities of Graphene Oxide Loaded Spiky Gold Nanocomposites via Chitosan linker

Le,

Tran

2023

JTE

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The graphene oxide (GO) loaded spiky gold (AuNS) nanocomposites were prepared by electrostatic interaction between negatively-charged GO nanosheets and positively-charged AuNS by the assistance of chitosan as linker molecules. The AuNS/GO nanocomposites exhibit a red-shift in the extinction spectra and a reduction in the zeta potential compared to those of the pristine AuNS due to the presence of oxygen-containing functional groups in GO. The bactericidal analysis demonstrates that the incorporation of GO greatly enhances the intrinsic antibacterial activities of AuNS. Besides, the AuNS with smaller size exhibit better bactericidal efficiency compared to that of AuNS with bigger size. Upon light irradiation, the AuNS/GO with the absorption peak close to the wavelength of excitation light (900 vs. 904 nm) demonstrates a noticeable improvement in the bactericidal efficiency which is attributed to the plasmon-induced photothermal effect. All these results suggest that the AuNS/GO nanocomposites can work as a promising functional material for both intrinsic and plasmon-induced antibacterial materials.

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One-pot, green and surfactant-less synthesis of polyhedral PdNPs anchored on GO as superior catalyst for reduction of 4-nitrophenol

Cited by 2 publications

References 43 publications

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Investigating the Antibacterial Activities of Graphene Oxide Loaded Spiky Gold Nanocomposites via Chitosan linker

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