TEMPO-oxidized cellulose for in situ synthesis of Pt nanoparticles. Study of catalytic and antimicrobial properties

In this work, platinum nanoparticles (PtNPs) were synthesized by a modified polyol process using TEMPO oxidized nanocellulose (TOCN) as a stabilizing and co-reducing agent. Different ratios of TOCN nanocellulose to Pt4+ ions were studied to establish the optimum stabilizing effect of PtNPs. The effect of different pH of aqueous TOCN suspensions on the morphology of PtNPs was also examined. It was proved that PtNPs can be obtained solely in the presence of TOCN without the use of an additional reducing agent or ethylene glycol. The morphology and structural properties of the nanocellulose-platinum nanoparticles composites were assessed using spectroscopic, microscopic and diffraction techniques, The catalytic performance in 4-nitrophenol reduction was evaluated. Significant differences in reaction rate constants k were found depending on the pH of the TOCN suspension applied during Pt4+ reduction. The crucial effect of reaction conditions on PtNPs performance was confirmed in tests of antibacterial efficacy against E. coli.

Automated summary

PtNPs were successfully synthesized using a modified polyol process with TOCN as a stabilizing and co-reducing agent. The optimal stabilizing effect of PtNPs was determined by studying different ratios of TOCN nanocellulose to Pt4+ ions. The influence of pH of aqueous TOCN suspensions on the morphology of PtNPs was also investigated. It was demonstrated that PtNPs could be obtained solely in the presence of TOCN without the need for an additional reducing agent or ethylene glycol. The morphology and structural properties of the nanocellulose-platinum nanoparticles composites were characterized using spectroscopic, microscopic, and diffraction techniques. The catalytic performance of PtNPs in 4-nitrophenol reduction and the antibacterial efficacy against E. coli were evaluated.