Catalytic and kinetic investigation of the encapsulated random alloy (Pdn-Au110-n) nanoparticles

Ilunga, Ali K.; Meijboom, Reinout

doi:10.1016/j.apcatb.2016.02.040

Cited by 18 publications

(14 citation statements)

References 41 publications

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“…This result can be attributed to adsorption constants K morin > K H 2 O 2 . 30 The morin and H 2 O 2 were first adsorbed onto the surface of the catalyst before reaction. As the concentration of morin increased, most of the surface area of Pd NPs inside of Pd 55 -G5MCI would be covered by morin.…”

Section: Resultsmentioning

confidence: 99%

Biocompatible Dendrimer-Encapsulated Palladium Nanoparticles for Oxidation of Morin

et al. 2019

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Development of highly efficient catalysts to expedite the degradation of organic dyes has been drawing great attention. The aggregation of catalysts reduces the accessibility of catalytic centers for organic dyes and therefore decreases their catalytic ability. Herein, we report a facile method to prepare highly biocompatible and stable dendrimer-encapsulated palladium nanoparticles (Pdn-G5MCI NPs), which exhibit high catalytic efficiency for oxidation of morin. The biocompatible dendrimers were prepared via surface modification of G5 polyamidoamine (G5 PAMAM) dendrimers using maleic anhydride and l-cysteine. Then, they were incubated with disodium tetrachloropalladate, followed by reduction using sodium borohydride to generate Pdn-G5MCI NPs. Transmission electron microscopy results demonstrated that palladium nanoparticles (Pd NPs) inside Pdn-G5MCI had small diameters (1.77–2.35 nm) and monodisperse states. Dynamic light scattering results confirmed that Pdn-G5MCI NPs had good dispersion and high stability in water. Furthermore, MTT results demonstrated that Pdn-G5MCI NPs had high biocompatibility. More importantly, Pdn-G5MCI NPs successfully catalyzed the decomposition of H2O2 to the hydroxyl radical (•OH), and the generated •OH quickly oxidized morin. This reaction kinetics followed pseudo-first-order kinetics. Apparent rate constant (kapp) is an important criterion for evaluating the catalytic rate. The concentrations of Pdn-G5MCI NPs and H2O2 were positively correlated with kapp, whereas the correlation between the concentration of morin and kapp was negative. The prepared Pdn-G5MCI NPs have great potential to catalyze the degradation of organic dyes in bio-related systems in the future.

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Section: Resultsmentioning

confidence: 99%

Biocompatible Dendrimer-Encapsulated Palladium Nanoparticles for Oxidation of Morin

et al. 2019

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“…Figure 7 b shows that after adding the catalyst PO-PdNPs 75 , the absorbance at 403 nm decreased rapidly with time, while the absorbance at 325 nm gradually increased with time. This phenomenon indicated that the morin underwent catalyzed oxidation to benzofuranone [ 31 ]. After a longer time, the peak at 325 nm decreased again, indicating that benzofuranone was further oxidized [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

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

Lai

Zhang

et al. 2021

Polymers

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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.

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“…In this study, PVP NPs (Au and Pd) were employed as catalysts for the oxidative degradation of morin (Scheme 1). Noble‐metal NPs such as palladium 30,35 and gold nanoparticles 2,36 are often used for the catalytic degradation of pollutants due to their high catalytic activity. Gold nanoparticles are because of their unique electromagnetic and chemical properties; 37 also they are relatively stable and can remain in solution for longer periods with less aggregation 33 .…”

Section: Introductionmentioning

confidence: 99%

Robotics‐assisted high‐throughput catalytic investigation of PVP nanoparticles in the oxidation of morin

Potgieter

Meijboom

2021

J of Chemical Tech & Biotech

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BACKGROUND Conventional methods used to evaluate the activity of catalysts are time consuming and tedious, which only several catalysts can successfully be discovered. By employing robotics, this approach can be shorted tremendously. A robotics‐assisted high‐throughput system for the fast and effective catalytic evaluation of Pd‐ and Au‐polyvinylpyrrolidone (PVP) nanoparticles (NPs) was investigated. RESULTS Palladium and gold PVP NPs were synthesised by employing ethylene glycol in the polyol method. These NPs were evaluated for the oxidation of morin using a high‐throughput system, including a liquid handling robot, a 96‐well plate and a microplate reader. The catalyst concentration variation step for both catalysts (Pd‐ and Au‐PVP NPs) was performed in one experiment in a 96‐well plate. A concentration range, including 12 concentrations in four replicates, was investigated simultaneously. Therefore, with one experiment, the optimal concentration of both catalysts could be determined. A similar approach was followed for the concentration variation steps of morin and hydrogen peroxide at different temperatures. This was done to determine the effect of concentration on the observed rate (kobs). CONCLUSION The catalytic oxidative degradation of morin can be investigated in a fast and effective way by employing robotics and a high‐throughput system. This system can also be applied to screen catalysts (homogeneous and heterogeneous catalyst) and the parallel synthesis of nanoparticles – particularly dendrimer‐encapsulated nanoparticles. © 2021 Society of Chemical Industry (SCI).

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Catalytic and kinetic investigation of the encapsulated random alloy (Pdn-Au110-n) nanoparticles

Cited by 18 publications

References 41 publications

Biocompatible Dendrimer-Encapsulated Palladium Nanoparticles for Oxidation of Morin

Biocompatible Dendrimer-Encapsulated Palladium Nanoparticles for Oxidation of Morin

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

Robotics‐assisted high‐throughput catalytic investigation of PVP nanoparticles in the oxidation of morin

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