Gold-decorated polymeric monoliths: In-situ vs ex-situ immobilization strategies and flow through catalytic applications towards nitrophenols reduction

Khalil, Ahmed M.; Georgiadou, Violetta; Guerrouache, Mohamed; Mahouche‐Chergui, Samia; Dendrinou‐Samara, Catherine; Chehimi, Mohamed M.; Carbonnier, Benjamin

doi:10.1016/j.polymer.2015.09.040

Cited by 49 publications

(25 citation statements)

References 67 publications

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“…Ion-track etched polymers coated with catalytically active metallic NPs have previously been investigated as potential catalysts in flow-reactors, showing very high 4-nitrophenol conversion rates. [28,32] Activity towards this reaction has been reported for many transition metals including Cu, [26] Au, [27,50,87] Ag, [32,88] Pd, [34,89] Pt [89,90] and Ru. [91] In the case of Ir, 4nitrophenol reduction has been studied on dispersed NPs with mixed results regarding the activity.…”

Section: Catalysis Experimentsmentioning

confidence: 81%

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

et al. 2020

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Electroless plating is a powerful tool in nanofabrication and is available for many of the noble transition metals. There is, however, a striking lack of electroless plating procedures for the rarer platinum‐group metals. In this work, two plating baths for nanoscale iridium coatings are developed and their conformality and nanofabrication potential are showcased by coating ion‐track‐etched polycarbonate membranes, creating Ir nanotubes in the process. Both plating solutions yield morphologically different deposits, indicating that the microstructure of the film can be tuned by adjusting the composition of the plating bath. The catalytic performance of the deposited materials is investigated by using membrane‐embedded nanotubes as catalysts for the reduction of 4‐nitrophenol and methyl orange by borohydride, showing remarkable activity and stability. Operation in flow‐through configuration, in which the metallized membrane is implemented as a microreactor greatly enhances the interaction with the catalyst surface, considerably increasing product yield. The results highlight the potential of Ir nanoplating for realizing sophisticated nanostructures and heterogeneous catalysts, but also illustrate the intricacies related to the complex chemistry of electroless Ir plating baths.

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Section: Catalysis Experimentsmentioning

confidence: 81%

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

et al. 2020

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“…The catalytic activity of Au-SiO 2 @AeThio was tested in the reduction of 4-NP to 4-AP, according to what reported in the ESI. † [23][24][25][26][27][28] The plots of ln(A t /A 0 ) as a function of reaction time (t) using different 4-NP/Au molar ratios, where A t and A 0 are the absorbance values at 400 nm at time t and 0, respectively, are reported in Fig. 7.…”

Section: Catalytic Activitymentioning

confidence: 99%

Functionalization of silica through thiol-yne radical chemistry: a catalytic system based on gold nanoparticles supported on amino-sulfide-branched silica

et al. 2016

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“…A key feature in the design of such composite catalyst is the strong anchoring of the nanocatalyst on polymer to prevent leaching phenomena, and to date, various approaches have been reported for the chemical modification of the polymer to ensure high affinity with the catalyst . Primary amines, thiols, amidine units, nitrogen‐rich conjugated rings, nitrogen/sulfur‐containing heterocycles, and carboxylic acids have proved efficient as ligands yielding immobilization interface compatible with operating conditions for heterogeneous catalysis and recyclability. Restricting the discussion to the case of PS, its chemical modification has been the subject of much investigation .…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of silver nanoparticles on densely amine‐functionalized polystyrene: Highly active nanocomposite catalyst for the reduction of methylene blue

Amari

Guerrouache

Mahouche‐Chergui

et al. 2018

Polymers for Advanced Techs

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In this contribution, polystyrene (PS) bearing nitrogen-rich ligands as chelation moieties for both Ag + ions and Ag (0) nanoparticles was prepared through successive chemical modifications of native PS including nitration (treatment with HNO 3 / H 2 SO 4 ), reductive amination (treatment with SnCl 2 /HCl), Michael addition of methyl acrylate, and grafting of ethyelenediamine. The as-synthesized PS derivative was further used to support silver nanoparticles through initial chelation of the silver nanoparticle ions precursor and subsequent chemical in situ reduction with sodium borohydride. Chemical structure of the PS derivatives was confirmed after each synthesis step by using complementary characterization methods including infrared and energy-dispersive X-ray spectroscopies, elemental analysis, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The catalytic activity of the PS-EAD/AgNP nanocomposite was demonstrated using the reduction of methylene blue to leucomethylene blue, as a model reaction. The reaction was monitored by UV-vis spectrophotometry and achieved with an excess of sodium borohydride allowing for a pseudo-first-order analysis of the kinetic reaction parameters.Quantitative reduction of the methylene blue was obtained upon successive catalytic cycles with a rate constant value of 0.4016 minute −1 .

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Gold-decorated polymeric monoliths: In-situ vs ex-situ immobilization strategies and flow through catalytic applications towards nitrophenols reduction

Cited by 49 publications

References 67 publications

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

Functionalization of silica through thiol-yne radical chemistry: a catalytic system based on gold nanoparticles supported on amino-sulfide-branched silica

In situ synthesis of silver nanoparticles on densely amine‐functionalized polystyrene: Highly active nanocomposite catalyst for the reduction of methylene blue

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