Reusable catalytic devices based on covalently anchored gold or palladium nanoparticles on chitosan nanofibres via dialdehyde cellulose

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F23%3A63574158" target="_blank" >RIV/70883521:28610/23:63574158 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Reusable catalytic devices based on covalently anchored gold or palladium nanoparticles on chitosan nanofibres via dialdehyde cellulose

Popis výsledku v původním jazyce

The wide range of applications of gold nanoparticles (AuNPs) is attributed to their diverse sizes, shapes, and the presence of functional substituents on the nanoparticle surface, which are influenced by the synthesis method and reaction parameters. Therefore, the design of the synthesis process plays a crucial role in fully harnessing the potential of AuNPs. The deposition of AuNPs onto substrates further expands their usability and facilitates handling. However, traditional techniques like spin or dip coating of AuNPs suffer from weak interactions between the nanoparticles and the substrate, leading to the leaching of AuNPs.ln this study, a novel and highly efficient approach is introduced for anchoring pre-made AuNPs onto a chitosan substrate by covalent bonding, utilizing dialdehyde cellulose (DAC). The research focuses on the synthesis of sub-10 nm AuNPs assisted by DAC (AuDAC) and the subsequent affinity anchoring of AuDAC onto chitosan nanofibers (AuCHIT) through a Schiff base reaction and subsequent reductive amination. This anchoring method achieves nearly quantitative efficacy and significantly improves the binding of the particles compared to traditional methods.The stability of AuCHIT is further enhanced by the reductive amination of imine bonds formed between DAC, AuDAC, and chitosan, which effectively crosslinking the surface of the nanofibers. The catalytic activity of bare AuDAC exhibits a turn-over frequency of up to 27.1 min-1 and is even higher for palladium nanoparticles obtained employing a similar approach. When tested in a model catalytic device, the catalytic efficacy of AuCHIT is comparable to that reported by other research groups while also demonstrating excellent stability and reusability in a broad pH range. The covalent anchoring does not hinder the catalytic activity of AuDAC, which remains consistent over multiple cycles.

Název v anglickém jazyce

Reusable catalytic devices based on covalently anchored gold or palladium nanoparticles on chitosan nanofibres via dialdehyde cellulose

Popis výsledku anglicky

The wide range of applications of gold nanoparticles (AuNPs) is attributed to their diverse sizes, shapes, and the presence of functional substituents on the nanoparticle surface, which are influenced by the synthesis method and reaction parameters. Therefore, the design of the synthesis process plays a crucial role in fully harnessing the potential of AuNPs. The deposition of AuNPs onto substrates further expands their usability and facilitates handling. However, traditional techniques like spin or dip coating of AuNPs suffer from weak interactions between the nanoparticles and the substrate, leading to the leaching of AuNPs.ln this study, a novel and highly efficient approach is introduced for anchoring pre-made AuNPs onto a chitosan substrate by covalent bonding, utilizing dialdehyde cellulose (DAC). The research focuses on the synthesis of sub-10 nm AuNPs assisted by DAC (AuDAC) and the subsequent affinity anchoring of AuDAC onto chitosan nanofibers (AuCHIT) through a Schiff base reaction and subsequent reductive amination. This anchoring method achieves nearly quantitative efficacy and significantly improves the binding of the particles compared to traditional methods.The stability of AuCHIT is further enhanced by the reductive amination of imine bonds formed between DAC, AuDAC, and chitosan, which effectively crosslinking the surface of the nanofibers. The catalytic activity of bare AuDAC exhibits a turn-over frequency of up to 27.1 min-1 and is even higher for palladium nanoparticles obtained employing a similar approach. When tested in a model catalytic device, the catalytic efficacy of AuCHIT is comparable to that reported by other research groups while also demonstrating excellent stability and reusability in a broad pH range. The covalent anchoring does not hinder the catalytic activity of AuDAC, which remains consistent over multiple cycles.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/GA23-07361S" target="_blank" >GA23-07361S: Syntéza zlatých nanočástic pro SERS a katalýzu řízená pomocí selektivně oxidovaných polysacharidů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů