Publicación

Tipo de publicación: Artículos científicos (Publicados en revistas de divulgación o científicas)

Título del artículo: Controlling growth of phototrophic bio?lms on limestone using CaZn 2 (OH) 6 ·2H O and ZnO nanoparticles

Registrado por: Sergio Gómez-Cornelio, Patricia Quintana

Año de publicación: 2022

Resumen: BACKGROUND: Deterioration by microbial activity is common in the built cultural heritage, where phototrophic microorganisms are primary colonizers that form complex communities associated with heterotrophic microorganisms. Therefore, this article analyses the antiphototrophic effect of ZnO and CaZn2(OH)6·2HO (CZ) nanoparticles (NPs) on three limestone lithotype coupons (Xcambo, red limestone and shellstone). The nanomaterials were obtained via sol–gel (SG), hydrothermal (HT) and mechanochemical (MS) routes and characterized using powder X-ray diffraction and scanning electron microscopy. Two concentrations of NPs (5000 and 10 000 ugmL?1) were applied to the coupons; afterwards, phototrophic microorganisms isolated from Chichén-Itzá, Yucatan were inoculated. The percentage of protection was calculated with ImageJ software, and chromatic
parameters were measured to identify visible changes in the stones.
RESULTS: The results show differences in the protective effect and color variations depending on the nanomaterials and phototrophic microorganisms applied in the limestone coupons. CZ and ZnO protect more than 72% on the surface of shellstone and Xcambo except for ZnO-SG in shellstone. The growth of Gloeocapsa sp. in red limestone with ZnO-SG and CZ-SG was equal to or greater than that of the control without NPs. In general, the NPs protect the limestone surface against phototrophic microorganisms up to 10% more than commercial algaecide. The coupons treated with ZnO-HT and CZ-HT have greater protection against bio?lm formation than other coatings.
CONCLUSIONS: In general, the coatings show a higher antiphototrophic protection than the controls, mainly the CZ-HT coatings, with better results at lower concentration. Therefore, these nanomaterials could be used to inhibit the formation of bio?lms on built cultural heritage.

Editorial:

Número de páginas:

Autor(es): Stephania Lázaro-Mass Javier Reyes-Trujeque Patricia Quintana Susana De la Rosa-García Montserrat Soria-Castro Sergio Gómez-Cornelio Claudia García-Solis, Antonio F. Fuentes,

Campo: Ingeniería

Disciplina: Ingeniería Química

Subdisciplina: Ciencia de materiales

Número de registro: DOI 10.1002/jctb.7065