Metal Nanoparticles as Green Catalysts

Narayan, Neel; Ashokkumar, Meiyazhagan; Vajtai, Róbert

doi:10.3390/ma12213602

Cited by 157 publications

(79 citation statements)

References 113 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the last ten years nanotechnology has enabled the enhancement of low dimensional materials properties proponing their use in several application fields, such as sensors [1][2][3][4][5][6][7][8][9][10][11][12], optics [13][14][15][16][17][18][19][20][21][22], energy [23][24][25][26], catalysis [27,28] and biotechnology [29][30][31][32][33][34]. Among others the noble metal nanomaterials were developed by bottom up approach with various morphologies such as spheres, cubes, stars, flowers and wires, showing significant chemical-physical properties that allow to unique interactions with the environment [35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

2020

View full text Add to dashboard Cite

This review provides an up-to-date overview on silver nanoparticles-based materials suitable as optical sensors for water pollutants. The topic is really hot considering the implications for human health and environment due to water pollutants. In fact, the pollutants present in the water disturb the spontaneity of life-related mechanisms, such as the synthesis of cellular constituents and the transport of nutrients into cells, and this causes long / short-term diseases. For this reason, research continuously tends to develop always innovative, selective and efficient processes / technologies to remove pollutants from water. In this paper we will report on the silver nanoparticles synthesis, paying attention to the stabilizers and mostly used ligands, to the characterizations, to the properties and applications as colorimetric sensors for water pollutants. As water pollutants our attention will be focused on several heavy metals ions, such as Hg(II), Ni(II),Cu(II), Fe(III), Mn(II), Cr(III/V) Co(II) Cd(II), Pb(II), due to their dangerous effects on human health. In addition, several systems based on silver nanoparticles employed as pesticides colorimetric sensors in water will be also discussed. All of this with the aim to provide to readers a guide about recent advanced silver nanomaterials, used as colorimetric sensors in water.

show abstract

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

2020

View full text Add to dashboard Cite

show abstract

“…In the last few decades, metal-based materials have been extensively fabricated to develop reactive catalysts for various chemical reactions (Astruc et al, 2005;Corma and Garcia, 2008;De Rogatis et al, 2010;Prati and Villa, 2013;Narayan et al, 2019). Nanoscale colloidal metal particles can possibly serve as quasi-homogeneous catalysts to overcome common pitfalls (e.g., recyclability and reactivity) of homogeneous and heterogeneous catalytic systems (Astruc et al, 2005;Prati and Villa, 2013;Price et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Comparative Catalytic Properties of Supported and Encapsulated Gold Nanoparticles in Homocoupling Reactions

et al. 2020

View full text Add to dashboard Cite

This report describes strategies to increase the reactive surfaces of integrated gold nanoparticles (AuNPs) by employing two different types of host materials that do not possess strong electrostatic and/or covalent interactive forces. These composite particles are then utilized as highly reactive and recyclable quasi-homogeneous catalysts in a CC bond forming reaction. The use of mesoporous TiO 2 and poly(N-isopropylacrylamide), PNIPAM, particles allows for the formation of relatively small and large guest AuNPs and provides the greatly improved stability of the resulting composite particles. As these AuNPs are physically incorporated into the mesoporous TiO 2 (i.e., supported AuNPs) and PNIPAM particles (i.e., encapsulated AuNPs), their surfaces are maximized to serve as highly reactive catalytic sites. Given their increased physicochemical properties (e.g., stability, dispersity, and surface area), these composite particles exhibit notably high catalytic activity, selectivity, and recyclability in the homocoupling of phenylboronic acid in water and EtOH. Although the small supported AuNPs display slightly faster reaction rates than the large encapsulated AuNPs, the apparent activation energies (E a) of both composite particles are comparable, implying no obvious correlation with the size of guest AuNPs under the reaction conditions. Investigating the overall physical properties of various composite particles and their catalytic functions, including the reactivity, selectivity, and E a , can lead to the development of highly practical quasi-homogeneous catalysts in green reaction conditions.

show abstract

“…[36][37][38] The application of metal nanoparticles as nanocatalysts has been demonstrated as an alternative to classic catalysts, improving the catalytic efficiency and permitting chemical reactions in more environmental benign conditions. [39][40][41] In this term, in our research group in the last years a new kind strategy based on the synthesis of novel nanobiohybrids consists in the in-situ generation of metal nanoparticles into a protein network have been pioneer established. These metal NPs-enzyme hybrids have been demonstrated as excellent heterogeneous catalysts in different reactions at milder conditions as usual.…”

Section: Introductionmentioning

confidence: 99%

“…The application of metal nanoparticles as nanocatalysts has been demonstrated as an alternative to classic catalysts, improving the catalytic efficiency and permitting chemical reactions in more environmental benign conditions …”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Phenols from Phenylboronic Acids in Aqueous Media Catalyzed by a Cu(0)‐Nanoparticles Biohybrid

2020

View full text Add to dashboard Cite

Selective hydroxylation of different phenylboronic acids to phenols was successfully carried out by using Cu nanoparticlesenzyme hybrid catalysts in water and room temperature. Different Cu-enzyme hybrids containing Cu(II), Cu(I) and Cu(0) nanoparticles species respectively were tested on the monohydroxylation of phenylboronic acid under these mild conditions being hybrids containing Cu(0)NPs the best catalysts, with total selectivity and formation of phenol as unique product. Also, the addition of hydrogen peroxide or the increase of reaction temperature were tested but did not improved these results. The substrate scope was also demonstrated and the Cu(0)NPs hybrid showed excellent results in the monohydroxylation of different o-, m-, p-substituted phenylboronic acid with final yields > 95 %. This catalyst showed excellent recyclability after 5 cycles of use.

show abstract

Metal Nanoparticles as Green Catalysts

Cited by 157 publications

References 113 publications

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

Comparative Catalytic Properties of Supported and Encapsulated Gold Nanoparticles in Homocoupling Reactions

Direct Synthesis of Phenols from Phenylboronic Acids in Aqueous Media Catalyzed by a Cu(0)‐Nanoparticles Biohybrid

Contact Info

Product

Resources

About