Special Issue "Green Chemistry for Nanoparticle Synthesis"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (15 September 2021) | Viewed by 7221

Special Issue Editors

Dr. Robert Wojcieszak
E-Mail Website
Guest Editor
Centre National de la Recherche Scientifique (CNRS), University of Lille, Centrale Lille, Villeneuve-d'Ascq, France
Interests: hybrid catalysis, nanomaterials, selective oxidation, biomass valorization, biorefineries
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Mohamed Nawfal Ghazzal
E-Mail Website
Guest Editor
Laboratoire de Chimie Physique, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
Interests: Porous materials; photocatalysis; Coating; sol-gel; Solar fuel

Special Issue Information

Dear Colleagues,

Metallic nanoparticles exhibit unusual optical, thermal, chemical and catalytic properties due to the combination of large proportion of high-energy surface atoms as compared to the bulk materials. Synthesis of metal nanoparticles has received considerable attention in the past two decades in view of the potential application for these materials to many industrial applications especially in pharmaceutical, optical, photochemical and chemical processes. There are generally two routes for preparation of very small metallic particles: top-down and bottom-up. Top-down methods reduce macroscopic particles to the well divided nanoscaled particles while bottom-up methods start with atoms that aggregate in solution or even in the gas phase to form particles of desired structure and morphology. Top-down processes are hardly suited for preparing particles with uniform shape. However, bottom-up routes are much better for generating uniform particles with distinct size, shape and structure. Several methods exist to synthetize finely divided metallic particles. But very often, harsh conditions or toxic solvents and precursors are used. Currently new greener methodologies are developed which permit to obtain metal nanoparticles with narrow size distribution and controlled morphology. These methods are based on the Green Chemistry principles focused on the tendency to realize free-pollution synthesis or perform synthesis with only few amounts of pollutant agents, using safe and renewable products and low energy demand.

This Special Issue of Nanomaterials is seeking papers that can demonstrate new developments in metallic nanoparticles synthesis taking into account the main principles of green chemistry. We are looking for excellent works dealing with new or/and revisited methods of homogeneous, heterogeneous or photocatalysts synthesis and their use in sustainable processes.

Dr. Robert Wojcieszak
Prof. Dr. Mohamed Nawfal Ghazzal
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanoparticles
  • nanomaterials
  • metallic particles
  • bimetallic particles
  • synthesis
  • green chemistry
  • heterogenous catalysis
  • photocatalysis
  • plasmonics
  • nano-objects
  • catalysis
  • catalytic transformations
  • active phase
  • sustainable methods
  • sustainable processes
  • biosourced materials
  • biotemplate
  • porous nanostructure
  • biomass

Published Papers (6 papers)

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Research

Article
Biogenic Synthesis of Silver-Core Selenium-Shell Nanoparticles Using Ocimum tenuiflorum L.: Response Surface Methodology-Based Optimization and Biological Activity
Nanomaterials 2021, 11(10), 2516; https://doi.org/10.3390/nano11102516 - 27 Sep 2021
Cited by 3 | Viewed by 803
Abstract
Bimetallic nanoparticles (BNPs) have shown better biological potential compared to their monometallic counterparts owing to the synergistic effect produced by these alloys. In this study, selenium-capped silver nanoparticles ([email protected] NPs) were synthesized using an Ocimum tenuiflorum extract. These BNPs were characterized using UV-visible, [...] Read more.
Bimetallic nanoparticles (BNPs) have shown better biological potential compared to their monometallic counterparts owing to the synergistic effect produced by these alloys. In this study, selenium-capped silver nanoparticles ([email protected] NPs) were synthesized using an Ocimum tenuiflorum extract. These BNPs were characterized using UV-visible, Fourier transform infrared spectroscopy, nanoparticle tracking analysis, electron microscopy and energy dispersive x-ray analysis. Response surface methodology was used to understand how extract volume and temperature influenced the zeta potential, hydrodynamic size and NP concentration. The phytoconstituents were identified using gas chromatography-mass spectrometry (GC-MS) and molecular docking studies were performed on B-DNA to determine possible genotoxicity. Antioxidant activities, in vitro cytotoxicity (3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay), and genotoxicity (Allium cepa root cells) of these BNPs, were also evaluated. A surface plasmon resonance band around 420 nm confirmed BNP formation with significant quantities of silver and selenium. The [email protected] NPs displayed good stability, dispersity, antioxidant activity, and compatibility at low concentrations but showed significant cytotoxicity and genotoxicity at high concentrations. Molecular docking analysis showed weak interactions between the plant constituents and B-DNA, suggesting no genotoxicity. These results provide an insight into the conditions required for optimal production of eco-friendly [email protected] NPs with interesting biological properties. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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Article
Environmentally Safe Biosynthesis of Gold Nanoparticles Using Plant Water Extracts
Nanomaterials 2021, 11(8), 2033; https://doi.org/10.3390/nano11082033 - 10 Aug 2021
Cited by 21 | Viewed by 1250
Abstract
Due to their simplicity of synthesis, stability, and functionalization, low toxicity, and ease of detection, gold nanoparticles (AuNPs) are a natural choice for biomedical applications. AuNPs’ unique optoelectronic features have subsequently been investigated and used in high-tech applications such as organic photovoltaics, sensory [...] Read more.
Due to their simplicity of synthesis, stability, and functionalization, low toxicity, and ease of detection, gold nanoparticles (AuNPs) are a natural choice for biomedical applications. AuNPs’ unique optoelectronic features have subsequently been investigated and used in high-tech applications such as organic photovoltaics, sensory probes, therapeutic agents, the administration of drugs in biological and medical applications, electronic devices, catalysis, etc. Researchers have demonstrated the biosynthesis of AuNPs using plants. The present study evaluates 109 plant species used in the traditional medicine of Middle East countries as new sources of AuNPs in a wide variety of laboratory environments. In this study, dried samples of bark, bulb, flower, fruit, gum, leaf, petiole, rhizome, root, seed, stamen, and above-ground parts were evaluated in water extracts. About 117 plant parts were screened from 109 species in 54 plant families, with 102 extracts demonstrating a bioreduction of Au3+ to Au0, revealing 37 new plant species in this regard. The color change of biosynthesized AuNPs to gray, violet, or red was confirmed by UV-Visible spectroscopy, TEM, FSEM, DLS, and EDAX of six plants. In this study, AuNPs of various sizes were measured from 27 to 107 nm. This study also includes an evaluation of the potency of traditional East Asian medicinal plants used in this biosynthesis of AuNPs. An environmentally safe procedure such as this could act as a foundation for cosmetic industries whose quality assessment systems give a high priority to non-chemically synthesized products. It is crucial that future optimizations are adequately documented to scale up the described process. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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Article
Microemulsion Derived Titania Nanospheres: An Improved Pt Supported Catalyst for Glycerol Aqueous Phase Reforming
Nanomaterials 2021, 11(5), 1175; https://doi.org/10.3390/nano11051175 - 29 Apr 2021
Viewed by 658
Abstract
Glycerol aqueous phase reforming (APR) produces hydrogen and interesting compounds at relatively mild temperatures. Among APR catalysts investigated in literature, little attention has been given to Pt supported on TiO2. Therefore, herein we propose an innovative titania support which can be [...] Read more.
Glycerol aqueous phase reforming (APR) produces hydrogen and interesting compounds at relatively mild temperatures. Among APR catalysts investigated in literature, little attention has been given to Pt supported on TiO2. Therefore, herein we propose an innovative titania support which can be obtained through an optimized microemulsion technique. This procedure provided high surface area titania nanospheres, with a peculiar high density of weak acidic sites. The material was tested in the catalytic glycerol APR after Pt deposition. A mechanism hypothesis was drawn, which evidenced the pathways giving the main products. When compared with a commercial TiO2 support, the synthetized titania provided higher hydrogen selectivity and glycerol conversion thanks to improved catalytic activity and ability to prompt consecutive dehydrogenation reactions. This was correlated to an enhanced cooperation between Pt nanoparticles and the acid sites of the support. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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Article
Effect of Oxygen-Containing Group on the Catalytic Performance of Zn/C Catalyst for Acetylene Acetoxylation
Nanomaterials 2021, 11(5), 1174; https://doi.org/10.3390/nano11051174 - 29 Apr 2021
Cited by 2 | Viewed by 548
Abstract
In this study, a series of activated carbon-based supports with different oxygen-containing groups (OCGs) proportions were obtained via thermal treatment in an ozone flow. Semiquantitative analyses indicated that the performance of the catalyst attained a maximum after 30 min of treatment with ozone [...] Read more.
In this study, a series of activated carbon-based supports with different oxygen-containing groups (OCGs) proportions were obtained via thermal treatment in an ozone flow. Semiquantitative analyses indicated that the performance of the catalyst attained a maximum after 30 min of treatment with ozone flow, and had a positive correlation with the content ratios of carboxyl and hydroxyl groups. Further, temperature-programmed desorption analysis demonstrated that the high performance (63% acetic acid conversion) of the prepared catalyst for the acetoxylation of acetylene could be ascribed to the reduced strength of increased capacity of acetylene adsorption. Density functional theory proved that the additional –COOH in the dicarboxylic catalytic system could be employed as a support for the active sites, and enhancing C2H2 adsorption strength in the rate-limiting step in the actual experimental process effectively accelerated the reaction rate. Thus, the OCGs on the surface of activated carbon play a crucial role in the catalytic performance of the acetylene acetoxylation catalyst. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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Article
Effect of Polyvinyl Alcohol Ligands on Supported Gold Nano-Catalysts: Morphological and Kinetics Studies
Nanomaterials 2021, 11(4), 879; https://doi.org/10.3390/nano11040879 - 30 Mar 2021
Cited by 4 | Viewed by 1369
Abstract
The effect of polyvinyl alcohol (PVA) stabilizers and gold nanoparticles supported on active carbon (AuNPs/AC) was investigated in this article. Polymers with different molecular weights and hydrolysis degrees have been synthesized and used, like the stabilizing agent of Au nano-catalysts obtained by the [...] Read more.
The effect of polyvinyl alcohol (PVA) stabilizers and gold nanoparticles supported on active carbon (AuNPs/AC) was investigated in this article. Polymers with different molecular weights and hydrolysis degrees have been synthesized and used, like the stabilizing agent of Au nano-catalysts obtained by the sol-immobilization method. The reduction of 4-nitrophenol with NaBH4 has been used as a model reaction to investigate the catalytic activity of synthesized Au/AC catalysts. In addition, we report several characterization techniques such as ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) in order to correlate the properties of the polymer with the metal nanoparticle size and the catalytic activity. A volcano plot was observed linking the catalytic performance with hydrolysis degree and the maximum of the curve was identified at a value of 60%. The Au:PVA-60 weight ratio was changed in order to explain how the amount of the polymer can influence catalytic properties. The effect of nitroaromatic ring substituents on the catalytic mechanism was examined by the Hammett theory. Moreover, the reusability of the catalyst was investigated, with little to no decrease in activity observed over five catalytic cycles. Morphological and kinetic studies reported in this paper reveal the effect of the PVA polymeric stabilizer properties on the size and catalytic activity of supported gold nanoparticles. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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Article
Nanocomposite Fiber Based on Natural Material for Water Disinfection under Visible Light Irradiation
Nanomaterials 2020, 10(6), 1192; https://doi.org/10.3390/nano10061192 - 18 Jun 2020
Cited by 4 | Viewed by 1650
Abstract
In the last decade, pathogenic bacteria and organic micropollutants have become a major issue in the water purification process. Heterogeneous photocatalysis is a low-cost and an ecofriendly process, which provides a sustainable solution for water treatment and its utilization in rural areas. In [...] Read more.
In the last decade, pathogenic bacteria and organic micropollutants have become a major issue in the water purification process. Heterogeneous photocatalysis is a low-cost and an ecofriendly process, which provides a sustainable solution for water treatment and its utilization in rural areas. In this context, we studied the generation and the surface engineering of polyacrylonitrile (PAN)/goethite composite nanofibers for photocatalytic water remediation under visible-light illumination. The photocatalytic activity was evaluated for dye (methylene blue) degradation and bacteria inactivation, as contaminant models, of the composite nanofibers. The PAN/goethite nanofibers were elaborated by an electrospinning technique, and the morphology and the composition, before and after spin coating, were investigated by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX). The results showed partially intercalated structures of the PAN/goethite Composite-nano-fiber (CNF) were identified by SEM and EDX analysis. The composite nanofibers exhibited high photoefficiency upon dye bleaching (only 10% left after 5 h of illumination) and bacterial deactivation Escherichia coli and Clostridium perfringens (4.4- and 3.5-fold, respectively, in less than 5 h). The steadiness and pliancy of the generated nanofibers provide a promising application in the continuous flow system. Full article
(This article belongs to the Special Issue Green Chemistry for Nanoparticle Synthesis)
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