Behaviour of titanium dioxide and zinc oxide nanoparticles in the presence of wastewater-derived organic matter and implications for algal toxicity
| Autor: | Elissa O'Malley, Peta A. Neale, Jan Herrmann, Åsa K. Jämting, Beate I. Escher |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Materials Science (miscellaneous) chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Settling Algae Humic acid Organic matter Effluent 0105 earth and related environmental sciences General Environmental Science chemistry.chemical_classification biology 021001 nanoscience & nanotechnology biology.organism_classification 6. Clean water chemistry Wastewater 13. Climate action Environmental chemistry Titanium dioxide 0210 nano-technology |
| Zdroj: | Environmental Science: Nano. 2:86-93 |
| ISSN: | 2051-8161 2051-8153 |
| DOI: | 10.1039/c4en00161c |
| Popis: | The properties of engineered nanomaterials (ENMs), such as their small size and increased reactivity, enable their use in a wide range of products; however, these attributes may also pose an environmental hazard. Wastewater effluent is expected to be a significant source of ENMs to the aquatic environment. Little is known about the behaviour and effect of ENMs in this complex matrix. The aim of this study was to assess the effect of titanium dioxide (TiO2) and zinc oxide (ZnO) ENMs on microalgae Pseudokirchneriella subcapitata in wastewater effluent and compare with more commonly tested matrices, specifically Talaquil growth media and Suwannee River humic acid. To better understand the toxicity results, ENM concentration, size and streaming potential in the different experimental matrices were assessed. The different media types had a significant influence on TiO2 behaviour, with TiO2 settling out of solution within the first 24 hours in wastewater. However, as TiO2 was not toxic to algae at the studied concentration, no difference in effect was observed between media, humic acid and wastewater. In contrast, media types had less of an influence on ZnO behaviour, with growth inhibition observed in all three media types at 72 hours, although the presence of organic matter delayed inhibition slightly. The results demonstrate that organic matter properties can have a significant influence on ENM behaviour, and while this did not translate into an effect on algae in the current study, it is still important to consider ENM behaviour and fate when working in different matrices. |
| Databáze: | OpenAIRE |
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