Synthesis of Fe3O4@SiO2–Ag magnetic nanocomposite based on small-sized and highly dispersed silver nanoparticles for catalytic reduction of 4-nitrophenol

Chi, Yuanying; Yuan, Qing; Li, Yanjuan; Tu, Jinchun; Zhao, Liang; Li, Nan; Li, Xiaotian

doi:10.1016/j.jcis.2012.06.027

Cited by 297 publications

(142 citation statements)

References 47 publications

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“…The smaller size consists of a high surface-tovolume ratio and more exposed Ag atoms on the surface, and these exposed atoms potently act as the catalytic sites. 55 These results suggested that AgNP-PG-5K might possess an important application in the field of heterogeneous catalysis.…”

Section: Resultsmentioning

confidence: 89%

Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

et al. 2013

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Baruah B, Gabriel GJ, Akbashev MJ, Booher ME. 2013. Facile synthesis of silver nanoparticles stabilized by cationic polynorbornenes and their catalytic activity in 4-nitrophenol reduction. Langmuir 29(13):4225-34. ABSTRACT: We report the facile one-pot single-phase syntheses of silver nanoparticles stabilized by norbornene type cationic polymers. Silver nanoparticles (AgNPs) stabilized by polyguanidino oxanorbornenes (PG) at 5 and 25 kDa and polyamino oxanorbornenes (PA) at 3 and 15 kDa have been synthesized by the reduction of silver ions with NaBH 4 in aqueous solutions at ambient temperature. The four different silver nanoparticles have been characterized by UV−vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and transmission electron microscopy (TEM) for their particle size distributions. Interestingly, PG stabilizes the silver nanoparticles better than PA as evident from our spectroscopic data. Furthermore, the AgNP-PG-5K (5K = 5 kDa) was found to serve as an effective catalyst for the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH 4 . The reduction has a pseudo-first-order rate constant of 5.50 × 10 −3 s −1 and an activity parameter of 1375 s −1 g −1 , which is significantly higher than other systems reported in the literature.

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Section: Resultsmentioning

confidence: 89%

Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

et al. 2013

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“…3, three curves 38 Such excellent magnetic properties indicate that all of the prepared samples have strong magnetic response and can be aggregated or separated easily by applying or removing an external magnetic field. 39 To test the spectral cleanness of the prepared SERS substrate, we have measured the Raman spectrum of blank Ag NPs-coated Fe 3 O 4 microspheres deposited on a Si substrate, with the result shown in Fig. 4(a).…”

Section: Results and Discusionmentioning

confidence: 99%

Maximizing surface-enhanced Raman scattering sensitivity of surfactant-free Ag-Fe3O4 nanocomposites through optimization of silver nanoparticle density and magnetic self-assembly

Bao

Lei

2013

Journal of Applied Physics

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Magnetic composite nanomaterials consisting of more than two functional constituents have been attracting much research interests due to the realization of multiple functionalities in a single entity. In particular, integration of ferromagnetic oxides and noble metal nanoparticles (NPs) in composites results in simultaneous magnetic activity and optical response where the optical property of the whole system could be modulated by application of an external magnetic field. In this work, we prepared Ag NPs-coated Fe 3 O 4 microspheres as a novel surfactant-free surfaceenhanced Raman scattering (SERS) substrate through a solid-phase thermal decomposition reaction. The SERS sensitivity of the fabricated nanocomposites is maximized by adjusting the size and density of Ag NPs supported on the Fe 3 O 4 microspheres and further increased by magneticfield-directed self-assembly of the composite substrates, with both effects attributed to the efficient generation of plasmonic near-field "hot" spots. At the optimal conditions, the prepared substrate is capable of detecting rhodamine 6G molecules at a concentration down to 10 À12 M, thus demonstrating the great potential of using bifunctional nanocomposites as an excellent candidate for ultra-high sensitive Raman spectroscopy and biosensors. We also reveal the underlying mechanisms responsible for the observed SERS enhancements through full-wave numerical simulations. V C 2013 AIP Publishing LLC. [http://dx

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“…For example, Chi et al 27 reported the reduction of . From these studies, it is clear that the catalytic performance of AgNPs(2)/ZHL hybrid (see TOF in Table 1) was superior to other Ag-containing inorganic (e.g., iron oxide, silica or graphene oxide) hybrid materials (Table 2).…”

Section: Application Of Agnps(x)/zhl Hybrids As Catalysts For Reductimentioning

confidence: 99%

“…From these studies, it is clear that the catalytic performance of AgNPs(2)/ZHL hybrid (see TOF in Table 1) was superior to other Ag-containing inorganic (e.g., iron oxide, silica or graphene oxide) hybrid materials (Table 2). 10,[26][27][28][29][30][31] This can be attributed to the deposition of AgNPs on external surfaces of ZHL, which gives high accessibility of the substrates to the active sites. In addition to the higher activity of AgNPs/ZHL catalysts, the one-pot synthetic procedure is also an advantage, surface modification was not needed, and light-visible irradiation was used as a reducing agent of Ag + ions.…”

Section: Application Of Agnps(x)/zhl Hybrids As Catalysts For Reductimentioning

confidence: 99%

Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol

Quites

Azevedo

Alves

et al. 2016

Journal of the Brazilian Chemical Society

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Silver nanoparticles and zinc hydroxide-layered hybrid materials (AgNPs/ZHL) have been successfully developed as efficient catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride. A facile and rapid visible-light assisted green route was used for the deposition of silver nanoparticles (AgNPs) on the external surface of ZHL material. The resulting AgNPs/ZHL hybrids contained AgNPs with spherical morphology and uniform size distribution. Moreover, the AgNPs/ZHL compounds exhibited excellent catalytic performance (the reduction reaction was finished within 4 min) and reusability (three cycles) toward the reduction of 4-NP to 4-AP in presence of sodium borohydride. The reduction reaction obeyed the pseudo-first-order kinetics. The rate constants increased with the increase of amount of the AgNPs deposited into the hybrid materials. These results suggest that the as-prepared catalysts (AgNPs/ZHL) have great potential for heterogeneous catalytic applications.

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Synthesis of Fe3O4@SiO2–Ag magnetic nanocomposite based on small-sized and highly dispersed silver nanoparticles for catalytic reduction of 4-nitrophenol

Cited by 297 publications

References 47 publications

Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

Maximizing surface-enhanced Raman scattering sensitivity of surfactant-free Ag-Fe3O4 nanocomposites through optimization of silver nanoparticle density and magnetic self-assembly

Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol

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