Comparison of PAMAM–Au and PPI–Au Nanocomposites and Their Catalytic Activity for Reduction of 4-Nitrophenol

Esumi, Kunio; Miyamoto, Κ.; Yoshimura, Tomokazu

doi:10.1006/jcis.2002.8580

Cited by 163 publications

(130 citation statements)

References 10 publications

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“…This follows the trend previously described, whereby the catalyst with higher surface-to-volume ratios has more dangling-bonds as activity sites on the surface, and will therefore be more active in promoting catalytic conversion [12][13][14]36]. The inclusion of Ag in the nanostars as a second metal could be detected (Table S1 and Figure S5), and could also contribute to the improved catalytic activity [16,[23][24][25]31]. The effect of the second metal in the catalysis will be extensively explored in our on-going project.…”

Section: Resultssupporting

confidence: 56%

“…Since the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using excess sodium borohydride as a reducing agent only in the presence of metal nanostructures as catalysts was reported in 2002 [15,16], this model reduction has been used to study the catalytic efficiency of metal nanostructures with different shape, size, and composition [2]. It has mostly been suggested that gold nanoparticles could catalyze this reaction by facilitating electron transfer from BH 4 − to 4-NP (Scheme 1), and the kinetics can be treated in terms of the Langmuir-Hinshelwood (LH) model [17,18].…”

Section: Introductionmentioning

confidence: 99%

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A Comparison Reduction of 4-Nitrophenol by Gold Nanospheres and Gold Nanostars

Yang

Liu

et al. 2017

Catalysts

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Abstract:In order to investigate structure-property relationships, the catalytic properties of gold nanoparticles were evaluated in the reduction of 4-nitrophenol by NaBH 4 . Using catalyst suspensions with identical amounts of gold, the following key results were obtained: first, the nanostars showed increased activity as compared to spherical gold nanoparticles; second, larger gold nanostars showed higher activity, likely because of the abundance of flat/spiky features on these particles, which show high metal utilization; third, treatment of the nanostar colloid with cucurbit [7]uril can be used to balance catalyst stability and activity; fourth, as expected from the decreasing surface atom fraction, the specific activity of the spherical nanoparticles decreased with increasing particle size.

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Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

A Comparison Reduction of 4-Nitrophenol by Gold Nanospheres and Gold Nanostars

Yang

Liu

et al. 2017

Catalysts

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“…1400 h ) was achieved with an Au/Ag ratio of 7/3, and was 5-40 fold higher those for the monometallic NPs. Esumi et al have proposed that the AuNPs-catalyzed 4-NP reduction, with an excess of NaBH 4 , proceeds in two steps: (1) the diffusion and adsorption of 4-NP to catalyst surface; and (2) an electron transfer mediated by the catalyst surface from BH 4 − to 4-NP [47,49]. They concluded that the first step is the rate limiting step in the 4-NP reduction.…”

Section: @ Zno Whisker and Papermentioning

confidence: 99%

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

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Bimetallic nanoparticles have attracted significant attention as their electrochemical and catalytic properties being superior to those of the individual component nanoparticles. In this study, gold-silver hybrid nanoparticles (AuAgNPs) with an Au core -Ag shell nanostructure were successfully synthesized on zinc oxide (ZnO) whiskers. The as-prepared nanocatalyst, denoted AuAgNPs @ ZnO whisker, exhibits an excellent catalytic efficiency in the aqueous reduction of 4-nitrophenol to 4-aminophenol; the turnover frequency was up to 40 times higher than that of each component nanoparticle. Their unique features were attributed to the electronic ligand effect at the bimetallic interface. In addition, the AuAgNPs were synthesized on a ZnO whisker-containing paper with a fiber-network microstructure, which was prepared via a papermaking technique. The paper-structured AuAgNPs composite possessed both a paper-like practical utility and a good catalytic performance. Furthermore, the on-paper synthesis process for these bimetallic nanocatalysts is facile. These easy-to-handle nanocatalyst hybrid composites are expected to find a wide range of applications in various chemical and catalytic processes.

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“…Among these, metal nanoparticles are most capable owing to their properties that depend on their size and morphology which makes them a proper aspirant in various applications [1][2][3][4]. Several methods are available for nanoparticle synthesis such as chemical [5], photochemical [6], electrochemical [7], and biological methods [8].…”

Section: Introductionmentioning

confidence: 99%

Microwave Assisted Biosynthesis of Silver Nanoparticles Using the Rhizome Extract of Alpinia galanga and Evaluation of Their Catalytic and Antimicrobial Activities

Joseph¹,

Mathew

2014

Journal of Nanoparticles

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Biomediated methods are considered to be a safer alternative to conventional physicochemical methods for the fabrication of nanomaterials due to their eco-friendly nature. In the present study, silver nanoparticles (AgNPs) were synthesized by microwave irradiation using aqueous rhizome extract of the medicinal plant Alpinia galanga. The nanoparticles were also synthesized under ambient condition without the assistance of microwave radiation and the former method was found to be much faster than the latter. The silver nanoparticles were characterized by UV-vis., FTIR, XRD, and HR-TEM analysis. UV-vis. spectroscopic studies provided ample evidences for the formation of nanoparticles. The FTIR spectrum confirmed the presence of plant phytochemicals as stabilizing agent around the AgNPs. XRD and HR-TEM analyses clearly proved the crystalline nature of the nanoparticles. From the TEM images, the nanoparticles were found to be roughly spherical in shape with an average diameter of 20.82 ± 1.8 nm. The nanoparticles showed outstanding catalytic activity for the reduction of methyl orange by NaBH 4 . The AgNPs were also evaluated for their antimicrobial activity by well diffusion method against S. aureus, B. subtilis, V. cholera, S. paratyphi, and A. niger. They were found to be highly toxic against all the tested pathogenic strains.

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Comparison of PAMAM–Au and PPI–Au Nanocomposites and Their Catalytic Activity for Reduction of 4-Nitrophenol

Cited by 163 publications

References 10 publications

A Comparison Reduction of 4-Nitrophenol by Gold Nanospheres and Gold Nanostars

A Comparison Reduction of 4-Nitrophenol by Gold Nanospheres and Gold Nanostars

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

Microwave Assisted Biosynthesis of Silver Nanoparticles Using the Rhizome Extract of Alpinia galanga and Evaluation of Their Catalytic and Antimicrobial Activities

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