Interactions and effects of metal oxide nanoparticles on microorganisms involved in biological wastewater treatment


Por: Cervantes-Avilés P., Díaz Barriga-Castro E., Palma-Tirado L., Cuevas-Rodríguez G.

Publicada: 1 oct 2017
Resumen:
To clarify the toxicological effects of metal oxide nanoparticles (NPs) on microorganisms with environmental relevance, it is necessary to understand their interactions. In this work, they were studied the effects and the morphological interactions of two metal oxide NPs (ZnO and TiO2) with microorganisms, during aerobic treatment of wastewater. The effects were evaluated according to nutrient removal from wastewater, while morphological interactions were determined by three different techniques such as TEM, HAADF-STEM, as well as an elemental mapping. According to results about effects of both NPs, they inhibited the removal of organic matter and ammonia nitrogen, and enhanced the orthophosphate removal. Related to morphological interactions, the electron-dense material of both NPs was mainly observed bounded to cell membrane. In tests with ZnO NPs, it was also observed electron-dense material internalized in microorganisms without physical damage in cell membrane. The elemental mapping was useful to determine that the electron-dense material corresponded to Zn and Ti. Both interactions, internalization and attachment of NPs on cell membrane of microorganisms may trigger the negative effect in the removal of organic matter and nitrogen.

Filiaciones:
Cervantes-Avilés P.:
 Univ Guanajuato, Div Engn, Dept Civil & Environm Engn, Av Juarez 77, Guanajuato 36000, Gto, Mexico

 Department of Civil and Environmental Engineering, Engineering Division, University of Guanajuato, Av. Juárez 77, Zona Centro, Guanajuato Gto. 36000, Mexico

Díaz Barriga-Castro E.:
 Res Ctr Appl Chem, Cent Lab Analyt Instrumentat, Blvd Enrique Reyna Hermosillo 140, Saltillo 25294, Coahuila, Mexico

 Central Laboratory of Analytical Instrumentation, Research Center on Applied Chemistry, Blvd. Enrique Reyna Hermosillo 140, Saltillo, Coahuila 25294, Mexico

Palma-Tirado L.:
 Univ Nacl Autonoma Mexico, Inst Neurobiol, Microscopy Unit, UNAM Campus Juriquilla 1-1141, Queretaro 76001, Mexico

 Microscopy Unit, Neurobiology Institute, National Autonomous University of México, UNAM Campus Juriquilla 1-1141, Querétaro, 76001, Mexico

Cuevas-Rodríguez G.:
 Univ Guanajuato, Div Engn, Dept Civil & Environm Engn, Av Juarez 77, Guanajuato 36000, Gto, Mexico

 Department of Civil and Environmental Engineering, Engineering Division, University of Guanajuato, Av. Juárez 77, Zona Centro, Guanajuato Gto. 36000, Mexico
ISSN: 1059910X
Editorial
Wiley-Liss Inc., 111 RIVER ST, HOBOKEN 07030-5774, NJ USA, Estados Unidos America
Tipo de documento: Article
Volumen: 80 Número: 10
Páginas: 1103-1112
WOS Id: 000411751100007
ID de PubMed: 28685923