EVALUATION OF THE COAT OF THE IGNIMBRITE USING POLISYLOXAN GEL FUNCTIONED WITH SILVER NANOPARTICLES

Abstract

The deterioration of buildings made with ignimbrite in the historic center of Arequipa is a problem caused by weathering, emission of industrial and biological pollutants, affecting its preservation. It was evaluated to apply to the ignimbrite, polysiloxane functionalized with silver nanoparticles (PXS-AgNPs), as a coating to reduce its porosity, prevent its degradation and give a protective effect to its surface.
Silver nanoparticles (AgNPs) were synthesized by reducing silver nitrate (AgNO3) with sodium borohydride (NaBH4), polysiloxane was synthesized by hydrolysis of chlorosilane in water and diethyl ether; which was functionalized with AgNPs, mixing aqueous solutions of PXS and AgNPs, obtaining a milky yellow gel. PXS-AgNPs were applied to the surface of the ignimbrite and adsorption tests were performed with 1ppm methylene blue solution, which was contrasted with ignimbrite without PXS-AgNPs. Finding in the ignimbrite with PXS-AgNPs a coverage percentage of 85.98% and in the ignimbrite without PXS-AgNPs a coverage percentage of 61.04%, with a difference of 36.65% adsorption, showing that with the PXS-AgNPs are enhanced protection of the ignimbrite.