Reduction of aromatic nitro compounds on colloidal hollow silver nanospheres

Vadakkekara, Raji; Chakraborty, Mousumi; Parikh, Parimal A.

doi:10.1016/j.colsurfa.2012.02.016

Cited by 48 publications

(41 citation statements)

References 37 publications

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“…43,44,[48][49][50][51] It is important to note that except for our recent report, 21 there was no example available in the literature where Os NPs were used for the catalysis reaction of the organic nitro compounds, so we compared our catalytic efficiency with other noble metals like Au and Ag. 43,44,[48][49][50][51] The anisotropic Au NPs also used as a catalyst for the 4-NA reduction and the rate constant value were found to be 2.083 Â 10 À2 min À1 . 2 In our previous report taking Os NCs in DNA as scaffold, we observed the first order catalytic reaction rate 3.87 Â 10 À2 min À1 for first 6 min and 0.45 min À1 for later 8 min.…”

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

“…22 In the present study we observed that the reaction rate was 0.26 min À1 which was the highest ever reported for Os NPs as a catalyst and much superior to other noble metals like Au or Ag. 2,22,43,44,[48][49][50][51] Apart from 4-NA, we also checked our catalysis reaction with other nitro compounds like 4-NP, 2-NP, 2-NA, etc., and in all cases the expected catalysis reduction taking place and the reaction were completed in different time scales. Table S1 (in the ESI †) shows the different nitro compounds tested and the corresponding time required for the full reduction.…”

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

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Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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A new route for the formation of osmium nanoparticles (NPs) having different morphologies like aggregated clusters, chain-like networks, and small spheres are reported. The synthesis was done by utilizing a simple wet-chemical method at room temperature (RT) by the reaction of OsO 4 , cetyl trimethyl ammonium bromide (CTAB), 2,7-dihydroxynaphthalene (2,7-DHN) and NaOH under 30 min of reaction. The diameter of the individual particles in all the morphologies was B1-3 nm. The synthesized materials have been tested for catalysis and SERS studies. The catalysis study was examined taking different organic nitro compounds and the catalysis rate was found superior as compared to other reports. The surface enhanced Raman scattering (SERS) study was done taking Rose Bengal (R Be) as a probe molecule and the observed enhancement factor (EF) value was found superior or comparable to most of other noble metal NPs. The overall synthesis process was simple, less time consuming and cost-effective. The enhanced catalytic and SERS activities of the Os NCs might open up a new avenue for the application in other organic catalysis reactions, SERS based detection of environmentally important trace bio-molecules and sensors.

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Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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“…We observed that the value of k app increases with an increase in concentration of NaBH 4 because the concentration of electron donor species is increasing. We also noted that the increase in the value of k app with an increase in concentration of NaBH 4 is not so significant because the concentration of NaBH 4 is 100 times larger as compared to that of NB in the reaction mixture [43]. Moreover, the time delay was not observed in case of high concentration of catalyst, i.e.…”

Section: Effect Of Concentration Of Sodium Borohydride On the Value Omentioning

confidence: 72%

Poly(N-isopropylacrylamide-co-methacrylic acid) microgel stabilized copper nanoparticles for catalytic reduction of nitrobenzene

Farooqi

Butt

Begum

et al. 2015

Materials Science-Poland

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Poly(N-isopropylacrylamide-co-methacrylic acid) microgels [p(NIPAM-co-MAAc)] were synthesized by precipitation polymerization of N-isopropylacrylamide and methacrylic acid in aqueous medium. These microgels were characterized by dynamic light scattering and Fourier transform infrared spectroscopy. These microgels were used as micro-reactors for in situ synthesis of copper nanoparticles using sodium borohydride (NaBH 4 ) as reducing agent. The hybrid microgels were used as catalysts for the reduction of nitrobenzene in aqueous media. The reaction was performed with different concentrations of catalyst and reducing agent. A linear relationship was found between apparent rate constant (k app ) and amount of catalyst. When the amount of catalyst was increased from 0.13 to 0.76 mg/mL then k app was increased from 0.03 to 0.14 min −1 . Activation parameters were also determined by performing reaction at two different temperatures. The catalytic process has been discussed in terms of energy of activation, enthalpy of activation and entropy of activation. The synthesized particles were found to be stable even after 14 weeks and showed catalytic activity for the reduction of nitrobenzene.

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“…Among various polymeric molecules investigated in literature, polyvinyl pyrrolidone (PVP) has been one of the most frequently used stabilizers since it is non-toxic and soluble in many polar solvents. While such PVP stabilized noble metal nanoparticles have extensively been used as catalysts for various reactions [10,11], few workers have concentrated in literature on the effect of such stabilizer molecule on the nanoparticle surface on their catalytic properties [12][13][14]. Nevertheless, only a few research papers have investigated the effect of such stabilization of nanoparticle surfaces on the electronic properties of such nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activation of PVP-Stabilized Gold/Silver Cluster on p- Nitrophenol Reduction: A DFT

Shukla¹,

Sinha²

2018

Density Functional Calculations - Recent Progresses of Theory and Application

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Systematic DFT calculations on poly(N-vinyl-2-pyrrolidone) (PVP) stabilization of Ag13 cluster have shown that the former acts not only as a stabilizer but also plays an important role in activating the Ag catalyst by supplying extra electrons to it through its oxygen atoms. Natural Bonding Orbital (NBO) calculations show that weak back donation of electrons from M(dπ) orbital of Ag to antibonding σ* of one of the N-O bond, facilitates the formation of the nitroso intermediate. Vibrational frequency calculation of PNP association with Ag13-2PVP cluster carried out to understand the extent and the nature of this interaction better. Red shift in the frequencies is result of strong interaction with that of silver cluster present in Ag13-2PVP-PNP model.

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Reduction of aromatic nitro compounds on colloidal hollow silver nanospheres

Cited by 48 publications

References 37 publications

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Poly(N-isopropylacrylamide-co-methacrylic acid) microgel stabilized copper nanoparticles for catalytic reduction of nitrobenzene

Catalytic Activation of PVP-Stabilized Gold/Silver Cluster on p- Nitrophenol Reduction: A DFT

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