scholarly journals One-Pot Facile Synthesis of Noble Metal Nanoparticles Supported on rGO with Enhanced Catalytic Performance for 4-Nitrophenol Reduction

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7261
Author(s):  
Xiaolong Zhang ◽  
Shilei Jin ◽  
Yuhan Zhang ◽  
Liyuan Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Measurement Techniques ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Pt Catalyst ◽  
One Pot ◽  
K Value ◽  
Nitrophenol Reduction ◽  
Gold Silver

In this study, reduced graphene oxide (rGO)-supported noble metal (gold, silver, and platinum) nanoparticle catalysts were prepared via the one-pot facile co-reduction technique. Various measurement techniques were used to investigate the structures and properties of the catalysts. The relative intensity ratios of ID/IG in rGO/Au, rGO/Ag, rGO/Pt, and GO were 1.106, 1.078, 1.047, and 0.863, respectively. The results showed the formation of rGO and that noble metal nanoparticles were decorated on rGO. Furthermore, the catalytic activities of the designed nanocomposites were investigated via 4-nitrophenol. The catalysts were used in 4-nitrophenol reduction. The catalytic performance of the catalysts was evaluated using the apparent rate constant k values. The k value of rGO/Au was 0.618 min−1, which was higher than those of rGO/Ag (0.55 min−1) and rGO/Pt (0.038 min−1). The result proved that the rGO/Au catalyst exhibited a higher catalytic performance than the rGO/Ag catalyst and the rGO/Pt catalyst. The results provide a facile method for the synthesis of rGO-supported nanomaterials in catalysis.

scholarly journals Polyethyleneimine-Oleic Acid Micelles-Stabilized Palladium Nanoparticles as Highly Efficient Catalyst to Treat Pollutants with Enhanced Performance

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1890
Author(s):  
Xiang Lai ◽  
Xuan Zhang ◽  
Shukai Li ◽  
Jie Zhang ◽  
Weifeng Lin ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Palladium Nanoparticles ◽  
Human Life ◽  
Catalytic Performance ◽  
Water Soluble ◽  
Noble Metal Nanoparticles ◽  
Hydrodynamic Diameter ◽  
Efficient Catalyst

Water soluble organic molecular pollution endangers human life and health. It becomes necessary to develop highly stable noble metal nanoparticles without aggregation in solution to improve their catalytic performance in treating pollution. Polyethyleneimine (PEI)-based stable micelles have the potential to stabilize noble metal nanoparticles due to the positive charge of PEI. In this study, we synthesized the amphiphilic PEI-oleic acid molecule by acylation reaction. Amphiphilic PEI-oleic acid assembled into stable PEI-oleic acid micelles with a hydrodynamic diameter of about 196 nm and a zeta potential of about 34 mV. The PEI-oleic acid micelles-stabilized palladium nanoparticles (PO-PdNPsn) were prepared by the reduction of sodium tetrachloropalladate using NaBH4 and the palladium nanoparticles (PdNPs) were anchored in the hydrophilic layer of the micelles. The prepared PO-PdNPsn had a small size for PdNPs and good stability in solution. Noteworthily, PO-PdNPs150 had the highest catalytic activity in reducing 4-nitrophenol (4-NP) (Knor = 18.53 s−1mM−1) and oxidizing morin (Knor = 143.57 s−1M−1) in aqueous solution than other previous catalysts. The enhanced property was attributed to the improving the stability of PdNPs by PEI-oleic acid micelles. The method described in this report has great potential to prepare many kinds of stable noble metal nanoparticles for treating aqueous pollution.

Hydroxyl-rich C-dots synthesized by a one-pot method and their application in the preparation of noble metal nanoparticles

2015 ◽  
Vol 51 (33) ◽  
pp. 7164-7167 ◽  
Author(s):  
Qiujun Lu ◽  
Jianhui Deng ◽  
Yuxin Hou ◽  
Haiyan Wang ◽  
Haitao Li ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
One Pot ◽  
Stabilizing Agent

Hydro-rich C-dots were used as both the reducing and stabilizing agent in the preparation of noble metal nanoparticles (AuNPs, AgNPs and Au@AgNPs) for the detection of glucose.

Enhanced Catalytic Activity of Magnetic Bimetallic Ag–Au Nanoparticles Mediated by Surface Plasmon Resonance

2021 ◽  
Vol 21 (5) ◽  
pp. 3107-3114
Author(s):  
Zhuo-Rui Li ◽  
Geng Zhu ◽  
Guo-Zhi Han
Keyword(s):  
Catalytic Activity ◽  
Surface Plasmon Resonance ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Au Nanoparticles ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Noble Metal Nanoparticles

We firstly discover the enhanced catalytic activity of magnetic noble metal nanoparticles mediated by surface plasmon resonance. Under light irradiation with certain wavelength, the catalytic performance of magnetic noble metal nanoparticles shows changes with different degrees and directions that are associated with the surface plasmon resonance (SPR) of the noble metal. Moreover, the coupling of silver and gold allows the catalytic performance of magnetic bimetallic Ag–Au nanoparticles to show more positive response to surface plasmon resonance. The magnetic bimetallic Ag–Au nanoparticles show excellent catalytic performance toward the reduction reaction of aromatic nitro group, and corresponding rate constant of the catalytic reduction reaction increases about three times with light irradiation.

Fabrication of noble metal nanoparticles decorated on one dimensional hierarchical polypyrrole@MoS2 microtubes

2020 ◽  
Vol 8 (34) ◽  
pp. 7801-7811 ◽  
Author(s):  
Yang Ling ◽  
Tiantian Cao ◽  
Libin Liu ◽  
Jingli Xu ◽  
Jing Zheng ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
One Dimensional

Herein, we present a facile strategy to fabricate noble metal (Ag, Au, Pd) decorated on PPy@MoS2 microtubes. As a proof of application, the ternary PPy@MoS2@Au hybrids reveal excellent enzyme-like catalytic performance.

scholarly journals Organotrialkoxysilane-Functionalized Noble Metal Monometallic, Bimetallic, and Trimetallic Nanoparticle Mediated Non-Enzymatic Sensing of Glucose by Resonance Rayleigh Scattering

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 122
Author(s):  
Prem C. Pandey ◽  
Murli Dhar Mitra ◽  
Shubhangi Shukla ◽  
Roger J Narayan
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Metallic Nanoparticles ◽  
Rayleigh Scattering ◽  
Metal Cations ◽  
Pd Nanoparticles ◽  
Glucose Sensing ◽  
Noble Metal Nanoparticles ◽  
Resonance Rayleigh Scattering ◽  
Gold Silver

Organotrialkoxysilanes like 3-aminopropyltrimethoxysilane (3-APTMS)-treated noble metal cations were rapidly converted into their respective nanoparticles in the presence of 3-glycidoxypropylytrimethoxysilane (3-GPTMS). The micellar activity of 3-APTMS also allowed us to replace 3-GPTMS with other suitable organic reagents (e.g., formaldehyde); this approach has significant advantages for preparing bimetallic and trimetallic analogs of noble metal nanoparticles that display efficient activity in many practical applications. The formation of monometallic gold, silver, and palladium nanoparticles, bimetallic Ag-Pd, and Au-Pd nanoparticles at various ratios of noble metal cations, and trimetallic Ag-Au-Pd nanoparticles were studied; their biocatalytic activity in non-enzymatic sensing of glucose based on monitoring synchronous fluorescence spectroscopy (SFS) was assessed. Of these nanoparticles, Au-Pd made with an 80:20 Au:Pd ratio displayed excellent catalytic activity for glucose sensing. These nanoparticles could also be homogenized with Nafion to enhance the resonance Rayleigh scattering (RRS) signal. In this study, the structural characterization of noble metal nanoparticles as well as bi- and tri-metallic nanoparticles in addition to their use in non-enzymatic sensing of glucose are reported.

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