Anew type of water soluble PEG core dendrimer having hydroxyl groups at the periphery was synthesized and used to prepare silver nanoparticles. The dendrimer and the dendrimer encapsulated nanoparticles (DENs) were characterized by spectroscopic techniques. The kinetics of catalytic activity of the prepared silver nanoparticle on the reduction of 4-nitrophenol to 4-aminophenol by NaBH4 as a reductant was studied using UV-Visible spectrophotometer. © 2012 The Chemical Society Located in Taipei &amp;Wiley-VCH Verlag GmbH &amp;Co. KGaA, Weinheim.

Asharani I-V

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Thirumalai D.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Journal of the Chinese Chemical Society

There is a growing demand for the development of non-toxic, cost-effective, and environmentally benign green synthetic strategy for the production of metal nanoparticles. Herein, the authors have reported Actinodaphne madraspatana Bedd (AMB) leaves as the bioreducing agent for the synthesis of palladium nanoparticles (PdNPs) and its catalytic activity was evaluated for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol with undisruptive effect on human health and environment. The broad and continuous absorbance spectrum obtained in the UV–visible region indicated the formation of PdNPs. The synthesized PdNPs were found to be crystalline, spherical, and quasi-spherical in shape with an average particle size of 13 nm was confirmed by X-ray diffractometer and transmission electron microscope. Fourier transform infrared spectra revealed the active photo constituents present in the aqueous extract of AMB involved in the bioreduction of palladium ions to PdNPs. The catalytic activity of biosynthesized PdNPs was demonstrated for the reduction of 4-NP via electron-relay process. Also, the influential parameters such as catalyst dosage, concentration of 4-NP, and sodium borohydride were studied in detail. From the present study, PdNPs were found to be a potential nanocatalyst for nitro compound reduction and also for environmental remediation of wastewater effluents from industries. © The Institution of Engineering and Technology 2017.

IET Nanobiotechnology

Catalytic reduction in 4-nitrophenol using Actinodaphne madraspatana Bedd leaves-mediated palladium nanoparticles

Polyethylene glycol (PEG) core dendrimer encapsulated silver nanoparticles (AgNPs) were synthesized through normal chemical reduction method, where dendrimer acts as reducing and stabilizing agent. The encapsulated AgNPs were well characterized using TEM, DLS and XPS techniques. The synthesized AgNPs showed excellent catalytic activity towards the reduction of aromatic nitro compounds with sodium borohydride as reducing agent and the results substantiate that dendrimer encapsulated AgNPs can be an effective catalyst for the substituted nitro aromatic reduction reactions. Also the kinetics of different nitro compounds reductions was studied and presented. © Published under licence by IOP Publishing Ltd.

Fulltext

IOP Conference Series: Materials Science and Engineering

Dendrimer encapsulated Silver nanoparticles as novel catalysts for reduction of aromatic nitro compounds

Abstract: Green synthesis of metal nanoparticles using earth abundant materials in the absence of any toxic solvent, reducing agent and protecting group is one of the emerging areas of research in materials chemistry. Herein, we report a green method for the synthesis of silver nanoparticles (AgNPs) using Actinodaphne madraspatana Bedd leaf extract as reducing as well as stabilizing agent. To our delight, AgNPs of different sizes could be readily synthesized by simply changing the pH of plant extract and the average size of AgNPs were found to be 60, 35 and 20 nm at pH 6, 9 and 12 respectively. The efficacy of prepared AgNPs towards the catalytic reduction of 4-nitrophenol (4-NP) has been investigated and the nanocatalysts have demonstrated excellent catalytic activity as evidenced from the rate constants. The kinetics of reduction reaction follows Langmuir–Hinshelwood mechanism, based on which the rate constant ‘k’ was calculated. The effect of catalyst dosage, concentration of 4-NP, concentration of NaBH4 and size of AgNPs towards catalytic reduction of 4-NP has been systematically investigated. It was interesting to notice that the AgNPs have exhibited size dependent catalytic activity towards reduction of 4-NP and the catalytic activity was found to increase with decrease in particle size. Graphical Abstract: [Figure not available: see fulltext.]. © 2017, Springer Science+Business Media New York.

Journal of Cluster Science

Size Dependent Catalytic Activity of Actinodaphne madraspatana Bedd Leaves Mediated Silver Nanoparticles

Bulk Nanostructured Materials

New Approaches to HPT Processing

Nanoscience and Nanotechnology

Water Bactericidal Properties of Nanosilver-Polyurethane Composites

Journal of Molecular Catalysis A: Chemical

Rapid, efficient and selective reduction of aromatic nitro compounds with sodium borohydride and Raney nickel

Polymer

‘Nano-tree’—type spherical polymer brush particles as templates for metallic nanoparticles

Angewandte Chemie International Edition

Nanoparticles as Recyclable Catalysts: The Frontier between Homogeneous and Heterogeneous Catalysis

Synthesis of Dendrimer-Encapsulated Silver Nanoparticles and Its Catalytic Activity on the Reduction of 4-Nitrophenol

Journal	Data powered by TypesetJournal of the Chinese Chemical Society
Publisher	Data powered by TypesetWiley
ISSN	0009-4536
Open Access	No