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
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