Investigation
of the Fate of Silver and Titanium Dioxide
Nanoparticles in Model Wastewater Effluents via Selected Area Electron
Diffraction
Posted on 2020-06-30 - 11:41
The
increasing use of manufactured nanomaterials (MNMs) and their
inevitable release into the environment, especially via wastewater
treatment plants (WWTPs), poses a potential threat for aquatic organisms.
The characterization of MNMs with analytical tools to comprehend their
fate and effect on the ecosystem is hence of great importance for
environmental risk assessment. We herein report, for the first time,
the investigation of physicochemical transformation processes during
artificial wastewater treatment of silver (Ag-NPs) and titanium dioxide
nanoparticles (TiO2-NPs) via selected area electron diffraction
(SAED). TiO2-NPs with an anatase/rutile ratio of ∼80/20
were found to not undergo any physicochemical transformation, as shown
via previous energy-dispersive X-ray analysis (EDX) elemental mapping
and crystal structure analysis via SAED. In contrast, Ag-NPs were
colocalized with substantial amounts of sulfur (Ag/S ratio of 1.9),
indicating the formation of Ag2S. SAED ultimately proved
the complete transformation of face-centered cubic (fcc) Ag-NPs into
monoclinic Ag2S-NPs. The size distribution of both nanomaterials
remained virtually unchanged. Our investigations show that cloud point
extraction of NPs and their subsequent crystal structure analysis
via SAED is another valuable approach toward the comprehensive investigation
of wastewater-borne MNMs. However, the extraction procedure needs
optimization for environmentally low NP concentrations.
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Steinhoff, Benedikt; Müller, Julian; Mozhayeva, Darya; Spelz, Bastian T. F.; Engelhard, Carsten; Butz, Benjamin; et al. (2020). Investigation
of the Fate of Silver and Titanium Dioxide
Nanoparticles in Model Wastewater Effluents via Selected Area Electron
Diffraction. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b07840
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AUTHORS (7)
BS
Benedikt Steinhoff
JM
Julian Müller
DM
Darya Mozhayeva
BS
Bastian T. F. Spelz
CE
Carsten Engelhard
BB
Benjamin Butz
HS
Holger Schönherr
KEYWORDS
titanium dioxide nanoparticlesModel Wastewater Effluentsratioenergy-dispersive X-ray analysisphysicochemical transformation proc...area electron diffractionAg 2 S-NPsinvestigationMNMAg 2 SSelected Area Electron Diffractioncloud point extractionWWTPEDXSAEDTiO 2Titanium Dioxide NanoparticlesAg-NPcrystal structure analysiswastewater treatment plantsnanomaterial