Fe/Au galvanic nanocells to generate self-sustained Fenton reactions without additives at neutral pH.

Autor: Shahnazarova G; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat.; Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain., Al Hoda Al Bast N; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat.; Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain., Ramirez JC; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat.; Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain., Nogues J; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat.; ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain., Esteve J; Instituto de Microelectrónica de Barcelona (IMB-CNM, CSIC), Barcelona, 08193, Spain. borja.sepulveda@csic.es., Fraxedas J; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat., Serra A; Grup d'Electrodeposició de Capes Primes i Nanoestructures (GE-CPN), Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Martí i Franquès, 1, E-08028, Barcelona, Catalonia, Spain.; Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Catalonia, Spain., Esplandiu MJ; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain. mariajose.esplandiu@icn2.cat., Sepulveda B; Instituto de Microelectrónica de Barcelona (IMB-CNM, CSIC), Barcelona, 08193, Spain. borja.sepulveda@csic.es.
Jazyk: angličtina
Zdroj: Materials horizons [Mater Horiz] 2024 May 07; Vol. 11 (9), pp. 2206-2216. Date of Electronic Publication: 2024 May 07.
DOI: 10.1039/d3mh01935g
Abstrakt: The generation of reactive oxygen species (ROS) via the Fenton reaction has received significant attention for widespread applications. This reaction can be triggered by zero-valent metal nanoparticles by converting externally added H 2 O 2 into hydroxyl radicals (˙OH) in acidic media. To avoid the addition of external additives or energy supply, developing self-sustained catalytic systems enabling onsite production of H 2 O 2 at a neutral pH is crucial. Here, we present novel galvanic nanocells (GNCs) based on metallic Fe/Au bilayers on arrays of nanoporous silica nanostructures for the generation of self-sustained Fenton reactions. These GNCs exploit the large electrochemical potential difference between the Fe and Au layers to enable direct H 2 O 2 production and efficient release of Fe 2+ in water at neutral pH, thereby triggering the Fenton reaction. Additionally, the GNCs promote Fe 2+ /Fe 3+ circulation and minimize side reactions that passivate the iron surface to enhance their reactivity. The capability to directly trigger the Fenton reaction in water at pH 7 is demonstrated by the fast degradation and mineralization of organic pollutants, by using tiny amounts of catalyst. The self-generated H 2 O 2 and its transformation into ˙OH in a neutral environment provide a promising route not only in environmental remediation but also to produce therapeutic ROS and address the limitations of Fenton catalytic nanostructures.
Databáze: MEDLINE
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