Synthesis, characterization, and evaluation of iron nanoparticles as hydrogenation catalysts in alcohols and tetraalkylphosphonium ionic liquids: do solvents matter?

Banerjee, Abhinandan; Yao, Yali; Durr, Michael-Roy R.; Barrett, William; Hu, Yongfeng; Scott, Robert W. J.

doi:10.1039/c8cy01346b

Cited by 4 publications

(5 citation statements)

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“…Studies by TEM and UV-Vis spectroscopy showed that nanoparticles can be regenerated and their activity recovered by reversing sintering [10]. The same group also showed that Fe nanoparticles in ionic liquids with strongly coordinating anions, e.g., halides, were not particularly stable to oxidation which makes a link to the present study [11]. Another published work shows that stability and catalytic activities were dependent on the nature of the ionic liquids and could be correlated with their ionicity [12].…”

Section: Introductionsupporting

confidence: 55%

On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

Vicente

Miguel

Gonçalves

et al. 2021

Sustainable Chemistry

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Ionic liquids are critical reagents for science and technical processes nowadays. Metals are the most used reagents in the industry. It is crucial to have a deeper understanding of how ionic liquids and metals could interact. In this article the interaction of those two families of compounds is accessed. The dissolution (reaction) of metals with ionic liquids is studied, namely the influence of temperature, redox potential, and availability of an oxidant in the process. The final state achieved by the iron metal samples was also addressed by Mössbauer spectroscopy.

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Section: Introductionsupporting

confidence: 55%

On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

Vicente

Miguel

Gonçalves

et al. 2021

Sustainable Chemistry

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“…Au NPs in TAPILs in the presence of oxygen oxidize to Au( i ) and then to Au( iii ); 37 similarly, Fe NPs in alcohol or water are protected from oxidative dissolution by a thin layer of passivating FeO x on the surface, while in TAPILs, they oxidize to soluble Fe( iii )Cl x ( x −3)− species. 39 Maier and co-workers found that metallic Cu, Ag, and Au foils showed considerable mass loss after exposure to [C 6 C 1 Im][Br 2 I] for 6 h at 40 °C; XPS was used to determine the final oxidation states of the dissolved metallic species. It was determined that only the monovalent ions [Au( i ), Ag( i ), Cu( i )] were formed.…”

Section: Resultsmentioning

confidence: 99%

“…34–36 They have also shown interesting properties related to catalyst recycling vis-à-vis the regeneration of catalytically deactivated metal NPs through redox cycles. 37–39…”

Section: Introductionmentioning

confidence: 99%

“…[34][35][36] They have also shown interesting properties related to catalyst recycling vis-à-vis the regeneration of catalytically deactivated metal NPs through redox cycles. [37][38][39] In 2005, Seddon et al examined the antibacterial action of a variety of TAPILs with the general formula [PR 3 R ′ ]X, where R and R ′ are alkyl groups and X is an anion such as halide, or a typical large non-coordinating ion. 40 They found that TAPILs with halide counterions, bearing alkyl chains ranging from pentyl to tetradecyl, showed antimicrobial activities particularly against cocci.…”

Section: Introductionmentioning

confidence: 99%

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Lethal weapon IL: a nano-copper/tetraalkylphosphonium ionic liquid composite material with potent antibacterial activity

Banerjee,

Aremu,

Dehghandokht

et al. 2023

RSC Sustain.

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“…Au NPs in TAPILs in the presence of oxygen oxidize to Au(I) and then to Au(III); 37 similarly, Fe NPs in alcohol or water are protected from oxidative dissolution by a thin layer of passivating FeO x on the surface, while in TAPILs, they oxidize to soluble Fe(III)Cl x (x−3)− species. 39 Maier and co-workers found that metallic Cu, Ag, and Au foils showed considerable mass loss aer exposure to [C 6 C 1 Im][Br 2 I] for 6 h at 40 °C; XPS was used to determine the nal oxidation states of the dissolved metallic species. It was determined that only the monovalent ions [Au(I), Ag(I), Cu(I)] were formed.…”

Section: Temporal Changes In Cu Speciation Within the Compositesmentioning

confidence: 99%

Lethal weapon IL: a nano-copper/tetraalkylphosphonium ionic liq-uid composite material with potent antibacterial activity

Banerjee,

Aremu,

Dehghandokht

et al. 2023

Preprint

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Ionic liquid (IL) based composite materials have shown great promise as antimicrobial coatings, owing to their inherent germicidal properties, as well as their ability to stabilize metal nanoparticles (NPs), which may serve as a secondary antimicrobial reservoir. Here, we show that tetraalkylphosphonium ILs (TAPILs) on their own can annihilate pathogens by interfering with their cell membranes; however, the nature of the alkyl substituents on the central P atom and the nature of the anion play decisive roles in determining their antimicrobial activities. Con-comitantly, TAPILs can stabilize copper nanoparticles (Cu NPs) generated directly within the IL matrices without the addition of any second-ary stabilizers. The composites thus generated were thoroughly characterized and shown to be far more lethal to E. coli than just the TAPILs. The antibacterial effect demonstrated by the composite created from P[6,6,6,8]Cl (TAPIL-2) was orders of magnitude more lethal to microbes in comparison with P[6,6,6,8]Cl or copper nanoparticles alone. Neither the parent TAPIL-2 nor composite-2 were compromised by ambient storage conditions over a period of months with regards to their bactericidal effects. The composite with the best performance (composite-2) also proved to be effective against a panel of selected microbes. SEM studies were conducted to image E. coli after exposure to the TAPILs or composite-2; with the latter, only bacterial debris were noticed post-exposure, indicating total bacterial annihilation. The killing kinetic assay and regression analyses for time-dependent bactericidal activity of composite-2 against E. coli and S. aureus demonstrated increase in log re-duction values over time, indicating the effectiveness of composite-2 in reducing the viable cell counts for both bacterial strains. Finally, Cu K-edge XANES was used to investigate the fate of Cu NPs within the composites, revealing oxidative disintegration of the Cu NPs within the TAPIL matrices over time, releasing charged copper ions and/or small copper clusters which interfere with the integrity and the permeability of E. coli cell membranes, inducing cell death. This was confirmed by SEM of bacterial preparations before and after exposure to both the TAPILs themselves as well as to the composites. Exposing E. coli to composite-2 causes complete cellular destruction, leaving behind cellular debris as the only visible organic matter. Thus, these TAPIL-based composites containing ‘ion reservoir’ metal NPs are potent antimicrobial materials, deserving additional research.

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Synthesis, characterization, and evaluation of iron nanoparticles as hydrogenation catalysts in alcohols and tetraalkylphosphonium ionic liquids: do solvents matter?

Abstract: Best recyclability seen for Fe nanoparticles in alcohol solvents in which Fe-core, Fe oxide shell nanoparticles are formed.

Cited by 4 publications

References 45 publications

On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

Lethal weapon IL: a nano-copper/tetraalkylphosphonium ionic liquid composite material with potent antibacterial activity

Lethal weapon IL: a nano-copper/tetraalkylphosphonium ionic liq-uid composite material with potent antibacterial activity

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