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

Albert Serrà, Yue Zhang, Borja Sepúlveda, Elvira Gómez, Josep Nogués, Johann Michler, Laetitia Philippe

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)

Abstract

© 2019 Elsevier Ltd 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 mg L−1 to 400 mg L−1. In particular, the ZnO@ZnS micro/nanoferns with a concentration of 400 mg L−1 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.
Original languageEnglish
Article number115210
Pages (from-to)115210
Number of pages12
JournalWater Research
Volume169
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • ALGAE
  • Biota
  • CUO
  • Catalysis
  • DECONTAMINATION
  • DEPOSITION
  • Ecotoxicity
  • Microalgae
  • NANOPARTICLES
  • Nanostructures
  • PERSISTENT ORGANIC POLLUTANTS
  • PHOTOACTIVITY
  • Persistent organic pollutants
  • Sunlight photocatalysis
  • TIO2
  • TOXICITY
  • WATER-TREATMENT TECHNOLOGY
  • Water Pollutants, Chemical
  • Zinc Oxide
  • ZnO-Based photocatalysts

Fingerprint

Dive into the research topics of 'Highly reduced ecotoxicity of ZnO-based micro/nanostructures on aquatic biota: Influence of architecture, chemical composition, fixation, and photocatalytic efficiency'. Together they form a unique fingerprint.

Cite this