Special Issue "Sustainable Nanoparticles - Their Synthesis and Catalytic Applications"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 30 June 2019

Special Issue Editors

Guest Editor
Prof. Dr. Rajender S. Varma

1) U.S. Environmental Protection Agency, ORD National Risk Management Research Laboratory, Cincinnati, Ohio, USA.
2) Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, Olomouc, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
Website 1 | Website 2 | E-Mail
Phone: (513)-487-2701
Fax: (513)-569-7677
Interests: organic chemistry; nanotechnology; synthetic organic chemistry; heterogeneous analysis; synthetic heterocyclic chemistry; nano-catalysis; microwave assisted organic synthesis
Guest Editor
Prof. Dr. Manoj B. Gawande

Regional Centre of Advanced Technologies and Materials, Palacky University, Šlechtitelů 27, 78371 Olomouc, Czech Republic
Website | E-Mail
Phone: +420776199164
Interests: nanocatalysis, 2D cabon nanostructures, biomass, green synthesis, benign reaction technologies

Special Issue Information

Dear Colleagues,

Sustainable nanomaterials have recently attracted tremendous attention as highly functionalized nanocatalysts or catalysts in diverse catalytic areas including solid-supported nanocatalysts, graphene materials, integrated catalysts, core-shell catalysts, among others. Rapid technology progress over the recent decades has allowed advances in the development of increasingly sustainable heterogeneous catalysts. In particular, catalytic materials can now be prepared with greater precision via nanotech-enabled processes. Metal nanoparticles, which often serve as active catalytic components, can be synthesized in a more environmentally friendly manner (using benign by design approaches) with well-defined sizes, shapes, crystal facets, structure, and composition. Such measured designs could potentially lead to advanced catalytic technologies and their applications in benign processes. Furthermore, the traditional need for efficient and selective catalytic reactions that transform raw materials into valuable chemicals, pharmaceuticals and fuels, green chemistry component also strives for waste reduction, atomic efficiency and high rates of catalyst recovery. This Special Issue is aimed to highlight key examples of advanced ‘benign by design’ nanomaterials with applications in heterogeneously catalyzed processes.

Prof. Dr. Rajender S. Varma
Dr. Manoj B. Gawande
Guest Editors

Manuscript Submission Information

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Subtopic

  • Magnetic nanocatalysts
  • Integrated catalysts
  • Core-shell nanocatalysts
  • Supported nanocatalysts
  • Biomass
  • Metal nanoparticles

Keywords

  • Sustainable nanocatalysts
  • Magnetic nanocatalysts
  • Benign catalytic Synthesis
  • Supported catalysts
  • Core/shell catalysts
  • Integrated catalysts

Published Papers (8 papers)

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Research

Open AccessArticle
Pd Nanocatalyst Adorning Coral Reef Nanocomposite for the Synthesis of Nitriles: Utility of Cucurbita pepo Leaf Extract as a Stabilizing and Reducing Agent
Nanomaterials 2019, 9(4), 565; https://doi.org/10.3390/nano9040565
Received: 25 February 2019 / Revised: 28 March 2019 / Accepted: 1 April 2019 / Published: 7 April 2019
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Abstract
A simple procedure for the palladium-catalyzed cyanation of aryl halides is described via a nucleophilic non-toxic cyanide source, K4[Fe(CN)6] in the presence of Pd/coral reef nanocomposite as a heterogeneous catalyst; the protocol provides a useful and easy method for [...] Read more.
A simple procedure for the palladium-catalyzed cyanation of aryl halides is described via a nucleophilic non-toxic cyanide source, K4[Fe(CN)6] in the presence of Pd/coral reef nanocomposite as a heterogeneous catalyst; the protocol provides a useful and easy method for the synthesis of aryl nitriles that are generated from the corresponding variant aryl halides, with sodium carbonate as a base. The nanocatalyst was prepared by a biological process using aqueous extract of leaves of Cucurbita pepo as a stabilizing and reducing agent and coral reef as a natural support, without deploying any hazardous chemicals. The catalyst, that is easily separable from the reaction mixture and reused multiple times, was characterized by FT-IR (Fourier-Transform Infrared Spectroscopy), ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy), XRD (X-ray Diffraction), TEM (Transmission Electron Microscopy), FE-SEM (Field Emission Scanning Electron Microscopy), EDS (Energy Dispersive X-ray Spectroscopy) and elemental mapping. Full article
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Open AccessArticle
Mesoporous Graphitic Carbon Nitrides Decorated with Cu Nanoparticles: Efficient Photocatalysts for Degradation of Tartrazine Yellow Dye
Nanomaterials 2018, 8(9), 636; https://doi.org/10.3390/nano8090636
Received: 17 July 2018 / Revised: 9 August 2018 / Accepted: 16 August 2018 / Published: 21 August 2018
Cited by 1 | PDF Full-text (3345 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A series of mesoporous graphitic carbon nitride (mpg-C3N4) materials are synthesized by directly pyrolyzing melamine containing many embedded silica nanoparticles templates, and then etching the silica templates from the carbonized products. The mass ratio of melamine-to-silica templates and the [...] Read more.
A series of mesoporous graphitic carbon nitride (mpg-C3N4) materials are synthesized by directly pyrolyzing melamine containing many embedded silica nanoparticles templates, and then etching the silica templates from the carbonized products. The mass ratio of melamine-to-silica templates and the size of the silica nanoparticles are found to dictate whether or not mpg-C3N4 with large surface area and high porosity form. The surfaces of the mpg-C3N4 materials are then decorated with copper (Cu) nanoparticles, resulting in Cu-decorated mpg-C3N4 composite materials that show excellent photocatalytic activity for degradation of tartrazine yellow dye. The materials’ excellent photocatalytic performance is attributed to their high surface area and the synergistic effects created in them by mpg-C3N4 and Cu nanoparticles, including the Cu nanoparticles’ greater ability to separate photogenerated charge carriers from mpg-C3N4. Full article
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Open AccessArticle
Functionalized Tyrosinase-Lignin Nanoparticles as Sustainable Catalysts for the Oxidation of Phenols
Nanomaterials 2018, 8(6), 438; https://doi.org/10.3390/nano8060438
Received: 22 May 2018 / Revised: 12 June 2018 / Accepted: 14 June 2018 / Published: 15 June 2018
Cited by 3 | PDF Full-text (3121 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Sustainable catalysts for the oxidation of phenol derivatives under environmentally friendly conditions were prepared by the functionalization of lignin nanoparticles with tyrosinase. Lignin, the most abundant polyphenol in nature, is the main byproduct in the pulp and paper manufacturing industry and biorefinery. Tyrosinase [...] Read more.
Sustainable catalysts for the oxidation of phenol derivatives under environmentally friendly conditions were prepared by the functionalization of lignin nanoparticles with tyrosinase. Lignin, the most abundant polyphenol in nature, is the main byproduct in the pulp and paper manufacturing industry and biorefinery. Tyrosinase has been immobilized by direct adsorption, encapsulation, and layer-by-layer deposition, with or without glutaraldehyde reticulation. Lignin nanoparticles were found to be stable to the tyrosinase activity. After the enzyme immobilization, they showed a moderate to high catalytic effect in the synthesis of catechol derivatives, with the efficacy of the catalyst being dependent on the specific immobilization procedures. Full article
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Open AccessArticle
Borylation of α,β-Unsaturated Acceptors by Chitosan Composite Film Supported Copper Nanoparticles
Nanomaterials 2018, 8(5), 326; https://doi.org/10.3390/nano8050326
Received: 30 April 2018 / Revised: 10 May 2018 / Accepted: 11 May 2018 / Published: 14 May 2018
Cited by 1 | PDF Full-text (1319 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
We describe here the preparation of copper nanoparticles stabilized on a chitosan/poly (vinyl alcohol) composite film. This material could catalyze the borylation of α,β-unsaturated acceptors in aqueous media under mild conditions. The corresponding organoboron compounds as well as their converted β-hydroxyl products were [...] Read more.
We describe here the preparation of copper nanoparticles stabilized on a chitosan/poly (vinyl alcohol) composite film. This material could catalyze the borylation of α,β-unsaturated acceptors in aqueous media under mild conditions. The corresponding organoboron compounds as well as their converted β-hydroxyl products were all obtained in good to excellent yields. It is noteworthy that this catalyst of copper nanoparticles can be easily recycled eight times and remained catalytically reactive. This newly developed methodology provides an efficient and sustainable pathway for the synthesis of organoboron compounds and application of copper nanoparticles. Full article
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Open AccessArticle
Iron Oxide-Cobalt Nanocatalyst for O-tert-Boc Protection and O-Arylation of Phenols
Nanomaterials 2018, 8(4), 246; https://doi.org/10.3390/nano8040246
Received: 24 February 2018 / Revised: 4 April 2018 / Accepted: 12 April 2018 / Published: 17 April 2018
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Abstract
Efficient and general protocols for the O-tert-boc protection and O-arylation of phenols were developed in this paper using a recyclable magnetic Fe3O4-Co3O4 nanocatalyst (Nano-Fe-Co), which is easily accessible via simple wet impregnation [...] Read more.
Efficient and general protocols for the O-tert-boc protection and O-arylation of phenols were developed in this paper using a recyclable magnetic Fe3O4-Co3O4 nanocatalyst (Nano-Fe-Co), which is easily accessible via simple wet impregnation techniques in aqueous mediums from inexpensive precursors. The results showed the catalysts were well characterized by XRD (X-ray Diffraction), ICP-AES (Inductive Coupled Plasma Atomic Emission Spectroscopy), TEM (Transmission Electron Microscopy), TOF-SIMS (Time-Of-Flight Secondary Ion Mass Spectrometry) and XPS (X-ray Photoelectron Spectroscopy). The O-tert-boc protection and O-arylation of phenols was accomplished in good to excellent yields (85–95%) and the catalyst was reusable and recyclable with no loss of catalytic activity for at least six repetitions. Full article
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Open AccessArticle
Aqueous-Phase Hydrogenolysis of Glycerol over Re Promoted Ru Catalysts Encapuslated in Porous Silica Nanoparticles
Nanomaterials 2018, 8(3), 153; https://doi.org/10.3390/nano8030153
Received: 5 February 2018 / Revised: 5 March 2018 / Accepted: 7 March 2018 / Published: 9 March 2018
Cited by 2 | PDF Full-text (14612 KB) | HTML Full-text | XML Full-text
Abstract
Activity improvement of Ru-based catalysts is needed for efficient production of valuable chemicals from glycerol hydrogenolysis. In this work, a series of Re promoted Ru catalysts encapuslated in porous silica nanoparticles (denoted as [email protected]2) were prepared by coating silica onto the [...] Read more.
Activity improvement of Ru-based catalysts is needed for efficient production of valuable chemicals from glycerol hydrogenolysis. In this work, a series of Re promoted Ru catalysts encapuslated in porous silica nanoparticles (denoted as [email protected]2) were prepared by coating silica onto the surface of chemically reduced Ru-polyvinylpyrrolidone colloids, and were used to catalyze the conversion of glycerol to diols and alcohols in water. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR) were used to characterize these nanoparticles. Effects of Ru/Si atomic ratio, Re addition, glycerol and catalyst concentrations, reaction time, temperature, and hydrogen pressure were investigated. Re addition retarded the reduction of ruthenium oxide, but increased the catalyst reactivity for glycerol hydrogenolysis. Due to its greater Ru content, [email protected] SiO2 showed much better activity (reacted at much lower temperature) and more yields of 1,2-propanediol and overall liquid-phase products than Re-Ru/SiO2 (prepared by conventional impregnation method) reported before. The rate of glycerol disappearance exhibited first-order dependence on glycerol concentration and hydrogen pressure, with an activation energy of 107.8 kJ/mol. The rate constant increased linearly with increasing Ru/Si atomic ratio and catalyst amount. The yield of overall liquid-phase products correlated well with glycerol conversion. Full article
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Open AccessArticle
Palladium Supported on Titanium Carbide: A Highly Efficient, Durable, and Recyclable Bifunctional Catalyst for the Transformation of 4-Chlorophenol and 4-Nitrophenol
Nanomaterials 2018, 8(3), 141; https://doi.org/10.3390/nano8030141
Received: 26 January 2018 / Revised: 26 February 2018 / Accepted: 27 February 2018 / Published: 2 March 2018
Cited by 5 | PDF Full-text (3337 KB) | HTML Full-text | XML Full-text
Abstract
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X [...] Read more.
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2 catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1· g pd 1 are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2 exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2 makes it as a potential material for practical applications. Full article
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Graphical abstract

Open AccessCommunication
MOF-Derived [email protected]2O Nanocatalyst for Oxygen Reduction Reaction and Cycloaddition Reaction
Nanomaterials 2018, 8(3), 138; https://doi.org/10.3390/nano8030138
Received: 28 November 2017 / Revised: 19 February 2018 / Accepted: 24 February 2018 / Published: 28 February 2018
Cited by 8 | PDF Full-text (12211 KB) | HTML Full-text | XML Full-text
Abstract
Research on the synthesis of nanomaterials using metal-organic frameworks (MOFs), which are characterized by multi-functionality and porosity, as precursors have been accomplished through various synthetic approaches. In this study, copper and copper oxide nanoparticles were fabricated within 30 min by a simple and [...] Read more.
Research on the synthesis of nanomaterials using metal-organic frameworks (MOFs), which are characterized by multi-functionality and porosity, as precursors have been accomplished through various synthetic approaches. In this study, copper and copper oxide nanoparticles were fabricated within 30 min by a simple and rapid method involving the reduction of a copper(II)-containing MOF with sodium borohydride solution at room temperature. The obtained nanoparticles consist of a copper core and a copper oxide shell exhibited catalytic activity in the oxygen reduction reaction. The as-synthesized [email protected]2O core-shell nanocatalyst exhibited an enhanced limit current density as well as onset potential in the electrocatalytic oxygen reduction reaction (ORR). Moreover, the nanoparticles exhibited good catalytic activity in the Huisgen cycloaddition of various substituted azides and alkynes under mild reaction conditions. Full article
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Graphical abstract

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