In this study, we present a novel multifunctional filler for protective coatings, highlighting its straightforward and rapid synthesis. This composite is based on halloysite nanotubes (HNTs), a naturally occurring clay mineral, covalently functionalized with kojic acid (K), a naturally occurring chelating agent. This unique combination offers powerful antibacterial and anticorrosive properties. The kojic acid-functionalized halloysite nanotubes (HNT-K) were then loaded with an ionic liquid (IL), leveraging synergistic interactions to effectively inhibit iron oxidation and provide robust surface protection. The composite underwent comprehensive characterization through Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), and Linear Polarization Resistance (LPR) analyses, which unequivocally confirmed successful functionalization and loading, along with a significant improvement in both corrosion resistance and antimicrobial efficacy. The composite demonstrated remarkable enhancements in the corrosion resistance of DD11 steel, notably reducing the corrosion rate from 0.34 mm/year to an impressive 0.12 mm/year. Furthermore, the material exhibited potent antimicrobial activity, especially against P. aeruginosa and C. albicans (69.23 and 84.61) as % of inhibition respectively, underscoring its immense potential for eco-friendly and sustainable applications in protective coatings. The utilization of halloysite and kojic acid, both sourced from nature, emphasizes the inherent sustainability of our approach, providing a truly green solution for surface protection with a powerful dual action: anticorrosive and antibacterial. We have thus successfully developed a novel, entirely natural-origin filler for paints offering this extraordinary dual action, all achievable through a fast and straightforward synthetic route.
Halloysite-based multifunctional filler for antibacterial and anticorrosive protective coatings: a sustainable approach using kojic acid and ionic liquids
Saccullo, ErikaCo-primo
;Ferlazzo, AngeloCo-primo
;Fuochi, Virginia;Furnari, Salvatore;Lombardo, Rosamaria;Spitaleri, Luca;Sfuncia, Gianfranco;Furneri, Pio Maria;Gulino, Antonino;Pignatello, Rosario;Rescifina, Antonio;Patamia, Vincenzo
Penultimo
Conceptualization
;Floresta, Giuseppe
Ultimo
Conceptualization
2025-01-01
Abstract
In this study, we present a novel multifunctional filler for protective coatings, highlighting its straightforward and rapid synthesis. This composite is based on halloysite nanotubes (HNTs), a naturally occurring clay mineral, covalently functionalized with kojic acid (K), a naturally occurring chelating agent. This unique combination offers powerful antibacterial and anticorrosive properties. The kojic acid-functionalized halloysite nanotubes (HNT-K) were then loaded with an ionic liquid (IL), leveraging synergistic interactions to effectively inhibit iron oxidation and provide robust surface protection. The composite underwent comprehensive characterization through Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), and Linear Polarization Resistance (LPR) analyses, which unequivocally confirmed successful functionalization and loading, along with a significant improvement in both corrosion resistance and antimicrobial efficacy. The composite demonstrated remarkable enhancements in the corrosion resistance of DD11 steel, notably reducing the corrosion rate from 0.34 mm/year to an impressive 0.12 mm/year. Furthermore, the material exhibited potent antimicrobial activity, especially against P. aeruginosa and C. albicans (69.23 and 84.61) as % of inhibition respectively, underscoring its immense potential for eco-friendly and sustainable applications in protective coatings. The utilization of halloysite and kojic acid, both sourced from nature, emphasizes the inherent sustainability of our approach, providing a truly green solution for surface protection with a powerful dual action: anticorrosive and antibacterial. We have thus successfully developed a novel, entirely natural-origin filler for paints offering this extraordinary dual action, all achievable through a fast and straightforward synthetic route.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
