Niobium Oxide (Nb2O5) Modified with Ag, Au, and Pt for Plasmonic Catalysts in the Photoelectrodegradation of Polyester Fiber Microplastics

• Grant number: 25/08476-1
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: January 01, 2026
• End date: December 31, 2028
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Susana Inés Córdoba de Torresi
• Grantee: Lara Kelly Ribeiro da Silva
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 21/00675-4 - Tying up materials for electrochemical energy storage and catalysis, AP.TEM

Abstract

This project aims to investigate the application of plasmon resonance using silver (Ag), gold (Au), and platinum (Pt) nanoparticles supported on niobium oxide (Nb2O5) for the degradation of microplastics, specifically those derived from polyester fibers in fabrics, both from the textile industry and domestic use (mainly from laundry). The Ag, Au, and Pt nanoparticles, combined with the Nb2O5 structure, are designed to enhance the generation of free radicals, facilitating the breakdown of polymer chains in microplastics and accelerating their degradation. To ensure the effectiveness of the process and identify the products generated during degradation, the project includes detailed monitoring of the reactive species using advanced spectroscopic techniques such as UV-Vis spectroscopy, FTIR spectroscopy, and mass spectrometry. These techniques will allow for precise determination of the material degradation mechanism, providing essential information about the formation of by-products and reactive intermediates. Within the project, the materials modified with the nanoparticles will be characterized and evaluated for degradation in a standard polyester fiber microplastic system to gain insights into the catalyst/degraded material interface. After this evaluation, the study will consider scaling up the process for large-scale applications. This includes optimizing reaction conditions to maximize photocatalytic efficiency, as well as adapting the methodology for industrial processes. Scaling up will involve economic and technical feasibility analysis for implementing the solution in real-world scenarios, such as textile effluent treatment stations and plastic waste recycling units. The degradation products will be analyzed using gas chromatography and mass spectrometry, while the behavior and efficiency of the photocatalytic materials will be monitored over time to assess their stability and regeneration. The green hydrogen (H2) byproduct generated during the process will also be evaluated as a potential additional source of clean energy. This approach not only addresses the growing issue of microplastic pollution but also contributes to circular economy and sustainability strategies by developing new solutions for plastic waste treatment. The project is also aligned with global decarbonization goals and innovations in green technologies, standing out for integrating plasmonic for advanced photocatalysis and sustainable nanomaterials to tackle a critical environmental challenge. (AU)