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Publikationstyp
Conference proceedings
Monographie
Monographie
Erscheinungsjahr
2016
DOI
Influence of natural organic matter and synthetic polymers on CeO2-nanoparticle colloidal stability and their transport through sand filter columns
Influence of natural organic matter and synthetic polymers on CeO2-nanoparticle colloidal stability and their transport through sand filter columns
Autor:innen
Herausgeber
Quelle
International Workshop on Nanoparticles in Soils and Waters: Fate, Transport and Effects (2016 : Landau)
Schlagwörter
Forschungskennzahl (FKZ)
Verbundene Publikation
Zitation
Influence of natural organic matter and synthetic polymers on CeO2-nanoparticle colloidal stability and their transport through sand filter columns, 2016. [online]. Landau. Verfügbar unter: https://openumwelt.de/handle/123456789/7060
Zusammenfassung englisch
The worldwide marked for engineered nanoparticles (ENPs) is growing and concerns on the environmental fate- and toxicity of ENPs are rising. Understanding the transport of ENPs within and between environmental compartments such as surface water and groundwater is crucial for risk assessment and the protection of drinking water resources. The transport of ENPs is strongly influenced by the surface properties and aggregation behaviour of the particles, which is strongly controlled by synthetic and natural organic coatings. Our aim is to assess the mobility of CeO2 ENPs with various surface coatings featuring different physico-chemical properties such as weakly anionic polyvinyl alcohol (PVA) or strongly anionic poly acrylic acid (PAA) or complex natural organic matter (NOM) during slow sand filtration. Therefore, we conduct batch experiments to assess colloidal stability and surface charge (zeta potential) of coated CeO2 ENPs in aqueous matrix under various hydrochemical conditions (pH, ionic strength) and sand filter column experiments to quantify CeO2 ENP transport. While uncoated CeO2 ENPs aggregate in the range of pH 4-8 in 1mM KCl electrolyte, our results show that PAA and PVA surface coatings as well as NOM sorbed to CeO2 ENP surfaces can stabilize CeO2 ENPs under neutral and alkaline pH conditions. With increasing concentrations of KCl, PVA coated particles aggregated first followed by the PAA coated ones. No aggregation was observed at up to 25 mM KCl for NOM coated CeO2 ENPs. CaCl2 had a stronger destabilizing effect on all coatings compared to KCl, inducing aggregation at CaCl2 concentrations >2 mM for PVA and CaCl2 >3mM for PAA and NOM coated CeO2 ENPs. Further results on the influence of KCl, CaCl2 and complex surface waters on aggregation of coated CeO2 ENPs and transport in sand filter columns will be presented. In: International Workshop on Nanoparticles in Soils and Waters: Fate, Transport and Effects ; Proceedings ; 20th - 21th October, 2016 Landau in der Pfalz, Germany. Landau: 2016