Highly reduced ecotoxicity of ZnO-based micro/nanostructures on aquatic biota : influence of architecture, chemical composition, fixation, and photocatalytic efficiency
Serrà, Albert (Empa Swiss Federal Laboratories for Materials Science and Technology)
Zhang, Yue (Institut Català de Nanociència i Nanotecnologia)
Sepúlveda, Borja (Institut Català de Nanociència i Nanotecnologia)
Gomez, Elvira (Universitat de Barcelona. Departament de Ciència de Materials i Química Física)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
Michler, Johann (Empa Swiss Federal Laboratories for Materials Science and Technology)
Philippe, Laetitia (Empa Swiss Federal Laboratories for Materials Science and Technology)

Fecha:	2020
Resumen:	Developing efficient sunlight photocatalysts with enhanced photocorrosion resistance and minimal ecotoxicological effects on aquatic biota is critical to combat water contamination. Here, the role of chemical composition, architecture, and fixation on the ecotoxicological effects on microalgae of different ZnO and ZnO@ZnS based water decontamination photocatalysts was analyzed in depth. In particular, the ecotoxicological effects of films, nanoparticles and biomimetic micro/nano-ferns were carefully assessed by correlating the algae's viability to the Zn(II) release, the photocatalyst-microalgae interaction, and the production of reactive oxygen species (ROS). The results showed a drastic improvement in algal viability for supported ZnO@ZnS core@shell micro/nanoferns, as their ecotoxicity after 96 h light exposure was significantly lower (3. 7-10. 0% viability loss) compared to the ZnO films (18. 4-35. 5% loss), ZnO micro/nanoferns (28. 5-53. 5% loss), ZnO nanoparticles (48. 3-91. 7% loss) or ZnO@ZnS nanoparticles (8. 6-19. 2% loss) for catalysts concentrations ranging from 25 mgL¯¹ to 400 mgL¯¹. In particular, the ZnO@ZnS micro/nanoferns with a concentration of 400 mg L exhibited excellent photocatalytic efficiency to mineralize a multi-pollutant solution (81. 4 ± 0. 3% mineralization efficiency after 210 min under UV-filtered visible light irradiation) and minimal photocorrosion (<5% of photocatalyst dissolution after 96 h of UV-filtered visible light irradiation). Remarkably, the ZnO@ZnS micro/nanoferns showed lower loss of algal viability (9. 8 ± 1. 1%) after 96 h of light exposure, with minimal reduction in microalgal biomass (9. 1 ± 1. 0%), as well as in the quantity of chlorophyll-a (9. 5 ± 1. 0%), carotenoids (8. 6 ± 0. 9%) and phycocyanin (5. 6 ± 0. 6%). Altogether, the optimized ZnO@ZnS core@shell micro/nanoferns represent excellent ecofriendly photocatalysts for water remediation in complex media, as they combine enhanced sunlight remediation efficiency, minimal adverse effects on biological microorganisms, high reusability and easy recyclability.
Ayudas:	European Commission 754364 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Ministerio de Economía y Competitividad PCIN2016-093 Ministerio de Economía y Competitividad TEC2017-85059-C3-2-R Ministerio de Economía y Competitividad SEV-2017-0706
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Ecotoxicity ; ZnO-Based photocatalysts ; Sunlight photocatalysis ; Microalgae ; Persistent organic pollutants
Publicado en:	Water Research, Vol. 169 (Feb. 2020) , art. 115210, ISSN 1879-2448

DOI: 10.1016/j.watres.2019.115210
PMID: 31670084

Preprint 51 p, 4.2 MB

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