Development of photocatalytic coatings for building materials with Bi2O3-ZnO nanoparticles

The aim of this study was to develop versatile coatings that can protect the stone surfaces of Ar-chitectural Heritage. Two different 3D media, namely superhydrophobic (SPHB) and hydrooleophobic (OHB), were utilized as host matrices for nanostructured photocatalysts (Bi2O3-ZnO 8/92). These photocata...

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Detalles Bibliográficos
Autores: Tena-Santafé, V.M. (Víctor Manuel)|||/items/62bbd3ed-df66-4ceb-a135-4cbe02828eff, Fernandez-Alvarez, J.M. (José María)|||/items/1dea5bde-978e-46db-8871-8d426cbb52c8, Fernandez-Acevedo, C. (Claudio)|||/items/0fe648eb-aeac-4840-baa8-d56c86e13156, Oroz-Mateo, T. (Tamara)|||/items/0bcd169f-5d5f-40e3-90c5-4174857029ca, Navarro-Blasco, I. (Iñigo)|||/items/733b109b-1074-49e9-8952-70ec6928cc54, Alvarez-Galindo, J.I. (José Ignacio)|||/items/c88ef755-513c-4ff3-bbff-44aadbf32204
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad de Navarra
Repositorio:Dadun. Depósito Académico Digital de la Universidad de Navarra
Idioma:inglés
OAI Identifier:oai:dadun.unav.edu:10171/67834
Acceso en línea:https://hdl.handle.net/10171/67834
Access Level:acceso abierto
Palabra clave:Química
Built heritage
Coating
Granite
Sandstone
Limestone
Photocatalyst
Waterproofing
Self-cleaning
Descripción
Sumario:The aim of this study was to develop versatile coatings that can protect the stone surfaces of Ar-chitectural Heritage. Two different 3D media, namely superhydrophobic (SPHB) and hydrooleophobic (OHB), were utilized as host matrices for nanostructured photocatalysts (Bi2O3-ZnO 8/92). These photocatalysts were sensitive to visible light to enhance their efficiency when exposed to sunlight. To prevent the nanophotocatalyst from clumping together in the 3D media, non-ionic dispersant additives (Tween20, TritonX-100, and Brij35) were incorporated. The optimized suspensions were then applied to various substrates such as sandstone, limestone, and granite. The effectiveness of the coatings was assessed by evaluating the hydrophobicity, oleo-phobicity, and photocatalytic activity of the coated substrates. The Bi2O3-ZnO photocatalyst exhib-ited higher activity in the SPHB medium compared to the OHB medium. To simulate real-life con-ditions, the coated substrates were subjected to accelerated weathering tests to predict their dura-bility. Despite a significant reduction in their thickness, the coatings demonstrated sustained hy-drophobic efficiency and self-cleaning capability after the accelerated ageing tests.

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