Shape-selective synthesis of gold nanoparticles and their catalytic activity towards reduction of p -nitroaniline

Gupta, Shyam Sunder R.; Kantam, M. Lakshmi; Bhanage, Bhalchandra M.

doi:10.1016/j.nanoso.2018.01.017

Cited by 36 publications

(16 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…reported shape‐dependent changes in the reactivity of micellar PtNPs supported on nanocrystalline γ‐Al 2 O 3 using the oxidation of 2‐propanol as a model reaction . Also, shape‐selective synthesis of AuNPs and their catalytic activity towards reduction of p‐nitroaniline to p‐aminoaniline was reported by Bhanage et al., in which octahedral NPs showed higher catalytic activity than spherical shaped NPs . The results obtained from the previous reports and in the present investigation showed that the anisotropic NPs possess higher catalytic activity than the spherical shaped NPs.…”

Section: Resultssupporting

confidence: 72%

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Marimuthu

Chandirasekar

Kasthuri³

et al. 2018

ChemistrySelect

View full text Add to dashboard Cite

In this study, photochemical synthesis of shape controlled silver nanoparticles (AgNPs) using 3‐[(3‐cholamidopropyl)‐dimethylammonium]‐1‐propanesulfonate (CHAPS) as a reducing and stabilizing agent has been reported. Since, CHAPS is a highly biocompatible zwitterionic bio‐surfactant with combined properties of both sulfobetaine type detergents and cholic acid, it acts as an ideal template for the preparation of biocompatible nanomaterials. The formation of AgNPs is influenced by the concentration of CHAPS and the pH of the reaction medium. Below the critical micellar concentration (CMC) of CHAPS anisotropic NPs were formed whereas above the CMC spherical shaped NPs were obtained. The optical properties of the nanoparticles (NPs) were studied using UV‐visible spectroscopy. Size and morphology of the NPs were analyzed using high resolution transmission electron microscopy (HR‐TEM) and dynamic light scattering techniques (DLS). The interaction of surfactant on the NPs surface was studied by Fourier‐transform infrared spectroscopy (FTIR) spectroscopy. The influence of the NPs′ shape on the catalytic performance was evaluated using the reduction of 4‐nitrophenol (4‐NP) to 4‐aminophenol (4‐AP) as a model reaction.

show abstract

Section: Resultssupporting

confidence: 72%

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Marimuthu

Chandirasekar

Kasthuri³

et al. 2018

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…However, it is generally accepted that catalytic performance depends on metal NP size, active site density, stability, and metal–support interaction. 50−55 The data presented in Tables 3 and 4 suggest that the reduction of nitro aromatic compounds in the aqueous phase by gold-based catalysts appears to be dominated by the size of gold NPs and nature of the gold–support interface.…”

Section: Resultsmentioning

confidence: 99%

Recyclable Au/SiO₂-Shell/Fe₃O₄-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution

Bhaduri

Das

Kumar³

et al. 2019

ACS Omega

View full text Add to dashboard Cite

Highly stable gold nanoparticles immobilized on the surface of amine-functionalized nanocomposite microspheres possessing a magnetite (Fe 3 O 4 ) nanoparticle core and a silica (SiO 2 ) shell (Au/SiO 2 -shell/Fe 3 O 4 -core) were prepared. These gold nanocomposite catalysts were tested for 4-nitrophenol (4-NP) and 2-nitroaniline (2-NA) reduction in aqueous solution in the temperature range 293–323 K and in the presence of aqueous NaBH 4 reducing agent. The magnetically recyclable gold catalyst showed high stability (∼3 months), efficient recyclability (up to 10 cycles), and high activity (∼100% conversion within 225 s, ∼700 ppm 4-NP or 2-NA). The pseudo-first-order apparent reaction rate constants ( k ) of 4-NP and 2-NA reduction were 7.5 × 10 –3 and 4.1 × 10 –3 s –1 , respectively, and with an apparent catalytic activity of 4.48 × 10 –8 kmol/(m 3 s).

show abstract

“…Regarding the TEM images in Figure 2, the nanoparticles were spherical and were able to reduce the 4-NP to 4-AP with less than 15 min. Gupta et al [19] have prepared different shapes of Au NPs for catalytic reduction of aromatic nitro compounds, and their results show that spherical Au NPs are the second-best catalyst compared to cubes, polyhedral, and tetrahedral shapes. In addition, there is no significant difference in reduction time between the spherical and cubic shapes, which is about a one-minute difference.…”

Section: Zeta Potential Analysismentioning

confidence: 99%

Synthesis of Bimetallic Gold-Silver (Au-Ag) Nanoparticles for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

et al. 2018

View full text Add to dashboard Cite

Bimetallic gold-silver nanoparticles as unique catalysts were prepared using seed colloidal techniques. The catalytic capabilities of the nanoparticles were ascertained in the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. Our results clearly showed that the rate of 4-NP reduction to 4-AP increased with a corresponding decrease in the diameter of the bimetallic NPs. The Au-Ag nanoparticles prepared with 5.0 mL Au seed volume indicated higher reduction activity, which was approximately 1.2 times higher than that of 2.0 mL Au seed volume in the reductive conversion of 4-NP to 4-AP. However, the monometallic NPs showed relatively less catalytic activity in the reductive conversion of 4-NP to 4-AP compared to bimetallic Au-Ag nanoparticles. Our studies also reinforced the improved catalytic properties of the bimetallic Au-Ag nanoparticles structure with a direct impact of the size or diameter and relative composition of the bimetallic catalytic nanoparticles.

show abstract

Shape-selective synthesis of gold nanoparticles and their catalytic activity towards reduction of p -nitroaniline

Cited by 36 publications

References 52 publications

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Recyclable Au/SiO₂-Shell/Fe₃O₄-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution

Synthesis of Bimetallic Gold-Silver (Au-Ag) Nanoparticles for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Contact Info

Product

Resources

About

Shape-selective synthesis of gold nanoparticles and their catalytic activity towards reduction of p -nitroaniline

Cited by 36 publications

References 52 publications

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Zwitterionic‐Biosurfactant‐Encapsulated Shape‐Controlled AgNPs: An Assessment of Shape Effect on Catalytic Properties

Recyclable Au/SiO2-Shell/Fe3O4-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution

Synthesis of Bimetallic Gold-Silver (Au-Ag) Nanoparticles for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Contact Info

Product

Resources

About

Recyclable Au/SiO₂-Shell/Fe₃O₄-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution