Characterization of aminophenol isomer adsorption on silver nanostructures

Perry, Donald A.; Cordova, James S.; Smith, Lauren G.; Son, Hye Jin; Biris, Alexandru S.

doi:10.1016/j.vibspec.2010.08.002

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…oxygen of the phenolate group [33]. However, these three main peaks continuously decreased 265 as reaction proceeded and finally disappeared after 78 min with increase of peaks at 1240 cm -1 (C-NH2 stretch) [34]. This indicates that p-AP may be formed in the vicinity of NZVI surfaces, 267 before being released into solution.…”

Section: Reduction Of P-np By Nzvi With Nabh4mentioning

confidence: 98%

Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Bae

Gim

Kim

et al. 2016

Applied Catalysis B: Environmental

251

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Section: Reduction Of P-np By Nzvi With Nabh4mentioning

confidence: 98%

Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Bae

Gim

Kim

et al. 2016

Applied Catalysis B: Environmental

251

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“…The surface of AgNPs was modelled from 4 × 4 cells with three layers of atoms, for both (111) and (100) faces. Additionally, as mentioned above and in accordance with previous studies published by other authors [ 59 , 60 ], the possibility of the existence of both p -nitrophenol and p -nitrophenolate species was considered, regarding the pH of the medium in which the reaction occurs.…”

Section: Resultsmentioning

confidence: 55%

Synthesis and Catalytic Application of Silver Nanoparticles Supported on Lactobacillus kefiri S-Layer Proteins

et al. 2020

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Research on nanoparticles obtained on biological supports is a topic of growing interest in nanoscience, especially regarding catalytic applications. Silver nanoparticles (AgNPs) have been studied due to their low toxicity, but they tend to aggregation, oxidation, and low stability. In this work, we synthesized and characterized AgNPs supported on S-layer proteins (SLPs) as bidimensional regularly arranged biotemplates. By different reduction strategies, six AgNPs of variable sizes were obtained on two different SLPs. Transmission electron microscopy (TEM) images showed that SLPs are mostly decorated by evenly distributed AgNPs; however, a drastic reduction by NaBH4 led to large AgNPs whereas a smooth reduction with H2 or H2/NaBH4 at low concentration leads to smaller AgNPs, regardless of the SLP used as support. All the nanosystems showed conversion values between 75–80% of p-nitrophenol to p-aminophenol, however, the increment in the AgNPs size led to a great decrease in Kapp showing the influence of reduction strategy in the performance of the catalysts. Density functional theory (DFT) calculations indicated that the adsorption of p-nitrophenolate species through the nitro group is the most favored mechanism, leading to p-aminophenol as the only feasible product of the reaction, which was corroborated experimentally.

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“…It is well-known that SERS is a short-ranged phenomena providing large Raman enhancement factors primarily in the monolayer . On the other hand, surface-enhanced infrared absorption (SEIRA) has a longer range effect where the infrared absorption can be enhanced in both the monolayer and the multiayer. − Used together, SERS and SEIRA can document all stages of thin organic and biological film growth. − …”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Vibrational Spectroscopy and Density Functional Theory Study of Isoniazid Layers Adsorbed on Silver Nanostructures

et al. 2014

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A combination of surface-enhanced Raman spectroscopy (SERS), surfaceenhanced infrared spectroscopy (SEIRA), and density functional theory (DFT) calculations are used to study the adsorption and thin film growth of isoniazid (an antimicrobial used to treat tuberculosis) on silver nanostructures (SNS). It is known that an isoniazid crystal takes on a C1 configuration where one of the hydrogens at the end of the hydrozyl group (−NH-NH 2 ) form an intramolecular hydrogen bond with the only oxygen atom. DFT calculations involving combinations of isoniazid dimers, trimers, and tetramers are used to model and interpret the Raman spectrum of isoniazid powder. The DFT calculations highlight the importance of accurately modeling hydrogen-bonding interactions between adjacent hydrozyl groups as well as interactions involving the ring nitrogen and the hydrozyl group. SERS, SEIRA, and DFT calculations involving isoniazid dimers and four-metal silver clusters reveal that isoniazid takes on a T conformation in a monolayer adsorbed on SNS where the hydrozyl group is rotated around a single bond so that the −NH 2 is oriented down with respect to the oxygen atom. Further evidence from the SEIRA and DFT calculations illustrate that the multilayer of isoniazid deposited from acetone maintains a geometry similar to the T conformation. In addition to the polar solvent acetone, n-heptane, a solvent with nonpolar bonds, is used to study the interactions of isoniazid with the SNS. These studies reveal that isoniazid has a stronger affinity for SNS when using n-heptane as the deposition solvent. An increase in attraction between isoniazid and the SNS is probably accomplished by changing the angle of interaction of the NH 2 and −NH groups with respect to the SNS. It is believed that a lower level of solvation occurs when using n-heptane as a deposition solvent, which allows for increased isoniazid attraction to the SNS.

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Characterization of aminophenol isomer adsorption on silver nanostructures

Cited by 13 publications

References 32 publications

Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Synthesis and Catalytic Application of Silver Nanoparticles Supported on Lactobacillus kefiri S-Layer Proteins

Surface-Enhanced Vibrational Spectroscopy and Density Functional Theory Study of Isoniazid Layers Adsorbed on Silver Nanostructures

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