TY - JOUR
T1 - Antimicrobial efficacy of building material based on ZnO/palygorskite against Gram-negative and Gram-positive bacteria
AU - Rosendo, Frederico R. G. V.
AU - Pinto, Lucas I. F.
AU - Lima, Idglan S. de
AU - Trigueiro, Pollyana
AU - Honório, Luzia M.de C.
AU - Fonseca, Maria Gardênnia
AU - Silva-Filho, Edson C.
AU - Ribeiro, Alessandra B.
AU - Furtini, Marcelo B.
AU - Osajima, Josy A.
PY - 2020/4
Y1 - 2020/4
N2 - This study investigated ZnO nanoparticles immobilized in palygorskite clay mineral (Pal) that acted as an inorganic antimicrobial agent in a commercial mortar aiming to control microorganisms and improve safety and stability for building applications. ZnO/Pal nanocomposites were obtained by sol-gel methods at pH 7 and 11 and were calcined at 250 °C and 400 °C to evaluate different synthesis parameters. The mortar/ZnO/Pal composite was obtained using 5% (by weight) ZnO/Pal hybrid mixed with a commercial mortar. The results show that pH and calcination temperature influenced the properties of ZnO/Pal. ZnO was observed in the ZnO/Pal samples during the wurtzite phase by analyzing the XRD patterns. FTIR spectra illustrated the interactions between ZnO nanoparticles and the fibrous clay mineral. TG-DTG analysis showed the thermal events of Pal before and after zinc incorporation. Scanning electron microscopy (SEM) evaluated ZnO morphology as spherical in shape and dispersed on the fibers of the clay minerals, which presented needle-like morphology. ZnO/Palygorskite showed a possible antibacterial effect when used in mortar formulation. The mortar/ZnO/Pal composites were effective against Escherichia coli and Staphylococcus aureus bacteria when tested by the direct contact method in darkness and in visible light and could be an alternative antimicrobial material for building surfaces.
AB - This study investigated ZnO nanoparticles immobilized in palygorskite clay mineral (Pal) that acted as an inorganic antimicrobial agent in a commercial mortar aiming to control microorganisms and improve safety and stability for building applications. ZnO/Pal nanocomposites were obtained by sol-gel methods at pH 7 and 11 and were calcined at 250 °C and 400 °C to evaluate different synthesis parameters. The mortar/ZnO/Pal composite was obtained using 5% (by weight) ZnO/Pal hybrid mixed with a commercial mortar. The results show that pH and calcination temperature influenced the properties of ZnO/Pal. ZnO was observed in the ZnO/Pal samples during the wurtzite phase by analyzing the XRD patterns. FTIR spectra illustrated the interactions between ZnO nanoparticles and the fibrous clay mineral. TG-DTG analysis showed the thermal events of Pal before and after zinc incorporation. Scanning electron microscopy (SEM) evaluated ZnO morphology as spherical in shape and dispersed on the fibers of the clay minerals, which presented needle-like morphology. ZnO/Palygorskite showed a possible antibacterial effect when used in mortar formulation. The mortar/ZnO/Pal composites were effective against Escherichia coli and Staphylococcus aureus bacteria when tested by the direct contact method in darkness and in visible light and could be an alternative antimicrobial material for building surfaces.
KW - Antibacterial activity
KW - Mortar
KW - Palygorskite
KW - Sol-gel technique
KW - ZnO
UR - http://www.scopus.com/inward/record.url?scp=85079644202&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2020.105499
DO - 10.1016/j.clay.2020.105499
M3 - Article
AN - SCOPUS:85079644202
SN - 0169-1317
VL - 188
JO - Applied Clay Science
JF - Applied Clay Science
M1 - 105499
ER -