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

Result code in 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>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

<a href="/en/project/GA23-07361S" target="_blank" >GA23-07361S: Synthesis of gold nanoparticles for SERS and catalysis guided by selectively oxidized polysaccharides</a><br>

Continuities

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

Publication year

2023

Confidentiality

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