Starch-supported gold nanoparticles and their use in 4-nitrophenol reduction

Chairam, Sanoe; Konkamdee, Wipawee; Parakhun, Ramita

doi:10.1016/j.jscs.2015.11.001

Cited by 99 publications

(46 citation statements)

References 45 publications

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“…Moreover, at present, with the need to have green synthesis and good care of the environment, the use of biodegradable polymers as reducing and stabilizing agents for AuNPs synthesis has increased. The use of less toxic molecules, such as natural polysaccharides, chitosan, sodium alginate, and starch, among others, has been studied considerably [38][39][40]. Table 1 summarizes some current reports on the synthesis of AuNPs with both synthetic and natural homopolymers.…”

Section: Polymers As Reducing and Stabilizing Agentsmentioning

confidence: 99%

“…Reducer and stabilizer~1 0 Spherical [40] Chitosan, acylated chitosan (hydrophobically modified chitosan with acyl groups) and chitosan oligosaccharide (short chain chitosan)…”

Section: Polymers As Reducing and Stabilizing Agentsmentioning

confidence: 99%

“…X-ray photoelectron spectroscopy (XPS) has been used to study the composition and the oxidation state of surfaces of AuNPs [40]. The green synthesis of luminescent AuNPs using N-(4-imidazolyl) methylchitosan (IMC), and the chitosan derivative biopolymer was reported by Nazirov et al [78].…”

Section: Electron Spectroscopy: X-ray Photoelectron Spectroscopy Xpsmentioning

confidence: 99%

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Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

et al. 2019

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The fundamental aspects of the manufacturing of gold nanoparticles (AuNPs) are discussed in this review. In particular, attention is devoted to the development of a simple and versatile method for the preparation of these nanoparticles. Eco-friendly synthetic routes, such as wet chemistry and biosynthesis with the aid of polymers, are of particular interest. Polymers can act as reducing and/or capping agents, or as soft templates leading to hybrid nanomaterials. This methodology allows control of the synthesis and stability of nanomaterials with novel properties. Thus, this review focus on a fundamental study of AuNPs properties and different techniques to characterize them, e.g., Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), UV-Visible spectroscopy, Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy, Small-angle X-Ray Scattering (SAXS), and rheology. Recently, AuNPs obtained by “green” synthesis have been applied in catalysis, in medicine, and as antibacterials, sensors, among others.

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Section: Polymers As Reducing and Stabilizing Agentsmentioning

confidence: 99%

“…Reducer and stabilizer~1 0 Spherical [40] Chitosan, acylated chitosan (hydrophobically modified chitosan with acyl groups) and chitosan oligosaccharide (short chain chitosan)…”

Section: Polymers As Reducing and Stabilizing Agentsmentioning

confidence: 99%

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Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

et al. 2019

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“…NaBH 4 was present in a large excess concentration as compared with that of 4-NP. [48] Figure 8 shows the XRD pattern and TEM of Cs/Au nanocomposite film after using for three catalytic cycles. the reaction rate (k) is independent of NaBH 4 concentration.…”

Section: -Npmentioning

confidence: 99%

“…This may be attributed to the availability of large number of active sites for degradation reaction. [48] Figure 8 shows the XRD pattern and TEM of Cs/Au nanocomposite film after using for three catalytic cycles. The diffraction peaks of Au nanoparticles were slightly narrowed and intensified.…”

Section: -Npmentioning

confidence: 99%

In situ preparation of chitosan/gold nanocomposite: Structural and catalytic properties

et al. 2017

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Chitosan-stabilized gold nanoparticles (Cs/Au) film was prepared by casting strategy without a need for reducing and/or stabilizing agents. The shape, size, and crystalline phase were studied using UV-visible (UV-vis) spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). The nature of the interaction between the Cs and Au nanoparticles was studied using the Fourier transformer infrared (FTIR) spectroscopy. The as-prepared Cs/Au nanocomposite film showed high activity in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP)in the presence of an excess amount of NaBH 4 . Furthermore, the Cs/Au film is easily separable, as well as remains active after reused for 3 times. The Cs/Au nanocomposite film could be a promising candidate for various catalytic reactions. K E Y W O R D S4-Nitrophenol, catalytic reduction, chitosan, gold, nanocomposite

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Finely dispersed palladium on silk‐fibroin as an efficient and ligand‐free catalyst for Heck cross‐coupling reaction

Mirzaei

Seyedi

2019

Applied Organom Chemis

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A palladium-fibroin complex (Pd/Fib.) was prepared by the addition of sonicated fibroin fiber in water to palladium acetate solution. Pd (OAc) 2 was absorbed by fibroin and reduced with NaBH 4 at room temperature to the Pd(0) nanoparticles. Powder-X-ray diffraction, scanning electron microscopyenergy-dispersive X-ray spectroscopy, Fourier transform-infrared, CHN elemental analysis and inductively coupled plasma-atomic emission spectroscopy were carried out to characterize the Pd/Fib. catalyst. Catalytic activity of this finely dispersed palladium was examined in the Heck coupling reaction.The catalytic coupling of aryl halides (-Cl, -Br, -I) and olefins led to the formation of the corresponding coupled products in moderate to high yields under air atmosphere. A variety of substrates, including electron-rich and electronpoor aryl halides, were converted smoothly to the targeted products in simple procedure. Heterogeneous supported Pd catalyst can be recycled and reused several times.

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Starch-supported gold nanoparticles and their use in 4-nitrophenol reduction

Cited by 99 publications

References 45 publications

Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

Nanoengineering of Gold Nanoparticles: Green Synthesis, Characterization, and Applications

In situ preparation of chitosan/gold nanocomposite: Structural and catalytic properties

Finely dispersed palladium on silk‐fibroin as an efficient and ligand‐free catalyst for Heck cross‐coupling reaction

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