Silver/dioxide titanium nanocomposites as biocidal treatments on limestones

  • Javier Becerra Luna
  • Ana Paula Zaderenko Partida
  • Pilar Ortiz Calderón

Resumen

Biodegradation of stones is a common and undesirable alteration in historical buildings. Restorers have been using different treatments, especially chemical methods, to prevent biodeterioration. These treatments often have disadvantages such as low long-term effectiveness, high toxicity on human health and the environment and/or physicochemical incompatibility with the original stone (chromatic alteration or chemical degradation).


In this research, different biocidal treatments based on silver and titanium dioxide nanocomposites have been tested on limestones from Utrera’s quarry (Seville, Spain), a stone employed in historical buildings in the south of Spain. Two AgNPs syntheses have been studied; the principal difference between them was the use of trisodium citrate as stabilizer.


Optimum nanocomposite composition and dosage to minimize chromatic alteration after application of treatments without cut down the biocide effectiveness have been set up. Treatments based on silver-titanium dioxide (Ag/TiO2) nanocomposites stabilized with citrate have been able to keep clean the limestone due to the biopatina formation reduction and the surface color change has been below 10%.

Biografía del autor

Javier Becerra Luna

Departamento de Sistemas Físicos, Químicos y Naturales. Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain. Undergraduate Degree in Conservation and Restoration from Seville University with special mention. Now, Javier is researching about nanotechnology applied to Cultural Heritage for his PhD thesis at the Pablo de Olavide University in Seville, Spain. He has received several awards, highlighting Graduate Student Awards in the E-MRS Spring Meeting (2016).

Ana Paula Zaderenko Partida

Departamento de Sistemas Físicos, Químicos y Naturales. Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain.  PhD in Chemistry and professor at the University Pablo de Olavide in Seville, Spain. Her research activity focuses on synthesis and characterization of nanoparticles and nanostructures applied to biomedicine, sensors and cultural heritage.

Pilar Ortiz Calderón

Departamento de Sistemas Físicos, Químicos y Naturales. Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain.  PhD in Chemistry and professor at the University Pablo de Olavide in Seville, Spain. Her research activity focuses on risk and vulnerability applied to cultural heritage, diagnosis of artwork conservation, non destructive techniques and assessment of restoration treatments.

Publicado
2017-06-30
Cómo citar éste artículo
BECERRA LUNA, Javier; ZADERENKO PARTIDA, Ana Paula; ORTIZ CALDERÓN, Pilar. Silver/dioxide titanium nanocomposites as biocidal treatments on limestones. Ge-conservación, [S.l.], v. 1, n. 11, p. 141-148, jun. 2017. ISSN 1989-8568. Disponible en: <http://ge-iic.com/ojs/index.php/revista/article/view/465>. Fecha de acceso: 23 nov. 2017

Palabras clave

Silver/titanium dioxide nanocomposite; biocide; conservation; limestone

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