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2020-02-01

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cc-by-nc-nd (c) Elsevier Ltd, 2019
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/143260

Highly reduced ecotoxicity of ZnO-based micro/nanostructures on aquatic biota: Influence of architecture, chemical composition, fixation, and photocatalytic efficiency

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Recurs relacionat

https://doi.org/10.1016/j.watres.2019.115210

Resum

Developing efficient sunlight photocatalysts with enhanced photocorrosion resistance and minimal eco-toxicological effects on aquatic biota is critical to combat water contamination. Here, the role of chem-ical 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 as-sessed by correlating the algae's viability to the Zn(II) release, the photocatalyst-microalgae interac-tion, 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 mg L-1 to 400 mg L-1. In particular, the ZnO@ZnS micro/nanoferns with a concentration of 400 mg L-1 exhibited ex-cellent photocatalytic efficiency to mineralize a multi-pollutant solution (81.4±0.3% mineralization ef-ficiency 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 min-imal 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 reme-diation in complex media, as they combine enhanced sunlight remediation efficiency, minimal adverse effects on biological microorganisms, high reusability and easy recyclability.

Matèries

Fotocatàlisi, Òxid de zinc, Contaminants persistents, Microalgues

Matèries (anglès)

Photocatalysis, Zinc oxide, Persistent pollutants, Microalgae

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

SERRÀ I RAMOS, Albert, et al. Highly reduced ecotoxicity of ZnO-based micro/nanostructures on aquatic biota: Influence of architecture, chemical composition, fixation, and photocatalytic efficiency. Water Research. 2020. Vol. 169, num. 115210. ISSN 0043-1354. [consulted: 20 of August of 2026]. Available at: https://hdl.handle.net/2445/143260

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