Graduate Thesis Or Dissertation
 

Development of traceable metal oxide nanoparticles for examining environmental fate and transport

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/41687m51b

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  • The fate and transport of engineered nanoparticles (ENPs) such as titanium dioxide (TiO₂) are of concern due to their increasing use in consumer products. Although analytical methods for detection and quantification of ENPs in environmental matrices are being developed, these methods are difficult, time consuming, and not easily validated for metal oxide ENPs where the metal of interest (e.g., Ti in TiO₂) is abundant in the environment. This work aims to overcome these difficulties by synthesizing TiO₂ nanoparticles "labeled" with rare earth elements. Synthetic conditions will be optimized to create particles consisting of a lanthanum oxide (La₂O₃) core surrounded by a TiO₂ shell. X-ray diffraction, dynamic light scattering, electron microscopy, and zeta potential analysis were used to compare relevant characteristics of synthesized ENPs with unlabeled lab and commercial counterparts. The utilities of labeled particles was then demonstrated using simulated drinking water treatment, an d the ability of labeled particles to be detected against background titanium concentrations shown.
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