Photocatalytic activity of white cement-based mortars with polysiloxane silicone and different doses of titanium dioxide nanoparticles

Jennyfer  Paiz-Rosales; Edward M. A. Guerrero-Gutiérrez; Susana Arrechea; Luis Velasquez; Roberto Diaz; Shirley Torres; Carmela Barrios; Elvis Garcia

doi:10.36829/63CTS.v9i1.1011

Autores/as

Jennyfer Paiz-Rosales Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala
Edward M. A. Guerrero-Gutiérrez Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala https://orcid.org/0000-0002-5778-3953
Susana Arrechea Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala
Luis Velasquez Centro de Investigación y Desarrollo CETEC, Cementos Progreso https://orcid.org/0000-0002-8299-7865
Roberto Diaz Centro de Investigación y Desarrollo CETEC, Cementos Progreso
Shirley Torres Centro de Investigación y Desarrollo CETEC
Carmela Barrios Centro de Investigación y Desarrollo CETEC
Elvis Garcia Centro de Investigación y Desarrollo CETEC, Cementos Progreso

DOI:

https://doi.org/10.36829/63CTS.v9i1.1011

Palabras clave:

Morteros, Cemento, Auto-limpieza, Nano-TiO2, Hidrofóbico

Resumen

Los morteros a base de cemento blanco generalmente se decoloran y alteran sus propiedades estéticas debido a los contaminantes del aire en las áreas urbanas. Nanopartículas añadidas a estos morteros pueden proporcionar propiedades fotocatalíticas que descomponen estos contaminantes. Asimismo, otros agentes hidrofóbicos se han estudiado individualmente para mejorar las construcciones a la intemperie. Por lo tanto, se presenta el efecto fotocatalítico e hidrofóbico al incorporar nano-TiO₂ y silicona hidrofóbica de polisiloxano (DOWSIL^TM) en una matriz de cemento blanco. El nano-TiO₂ se caracterizó por medio de Difracción de Rayos X (DRX); luego, el mortero se mezcló con adiciones de nano-TiO₂ (0.0, 0.5, 1.0, 3.0%) y DOWSIL^TM (0.0, 0.5%). Los morteros se sometieron a irradiación UV, para degradar el colorante orgánico rodamina B, monitoreando su variación de color usando un espectrofotómetro CIEL*a*b*. La eficiencia fotocatalítica del mortero se evaluó utilizando una modificación de la norma italiana Ente Nazionale Italiano di Unificazione 11259:2016 basada en la degradación de la rodamina B (RhB) en el mortero expuesto a la radiación UV. Además, se evaluó la permeabilidad al agua y el ángulo de contacto. Esta investigación demostró que el mortero de cemento con nano-TiO₂/DOWSIL^TM posee actividad fotocatalítica. Las muestras con 1.0%/0.5% y 3.0%/0.5% nano-TiO₂/DOWSIL^TM mostraron una mayor eficiencia de degradación de RhB para R₄ y R₂₆. Por lo tanto, estos materiales tienen potencial para mejorar la calidad de los morteros en construcciones urbanas.

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