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A SERS-based investigation of the molecular interaction between natural organic matter and colloidal silver nanoparticles in porous media

Fraley, Jessica L.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1409694849

Abstract Details

2014, Master of Science (MS), Wright State University, Chemistry.
The significant presence of silver nanoparticles (AgNPs) in numerous consumer products and various applications of today’s society raises major concerns with respect to their release into the environment. Because groundwater represents an important transport pathway from contamination sources to human and environmental receptors, it is critical to understand how natural organic matter (NOM), a main component of groundwater, interacts with colloidal AgNPs and influences their stability and mobility. Thus, this study uses Raman and surface-enhanced Raman spectroscopy (SERS) to examine the possible molecular interactions between widely-used Creighton AgNPs (11 mg L-1) and NOM (0-160.0 mg L-1 of humic and fulvic acids) in porous media (glass b>eads) and at various benchmark incubation times (0, 1 hr, 3 hrs, 1 day, 1 week, and 60 days). Additionally, fluorescence spectroscopy was employed to quantify the amount of NOM adsorbed onto AgNPs. It was found that NOM forms surface-complexed species with AgNPs mainly through the ionized carboxylic moieties located in the immediate vicinity of the metallic nanosurface, and the interaction becomes stronger with the increase in incubation time. The fluorescence emission spectra confirmed the Raman/SERS observations of significant fluorescence quenching upon the AgNP addition and the formation of AgNP-NOM-AgNP aggregates, which may decrease AgNP mobility during their groundwater transport.
Ioana Sizemore, Ph.D. (Advisor)
David Dolson, Ph.D. (Committee Member)
Rachel Aga, Ph.D. (Committee Member)
68 p.
Chemistry
chemistry

Recommended Citations

Citations

  • Fraley, J. L. (2014). A SERS-based investigation of the molecular interaction between natural organic matter and colloidal silver nanoparticles in porous media [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1409694849

    APA Style (7th edition)

  • Fraley, Jessica. A SERS-based investigation of the molecular interaction between natural organic matter and colloidal silver nanoparticles in porous media. 2014. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1409694849.

    MLA Style (8th edition)

  • Fraley, Jessica. "A SERS-based investigation of the molecular interaction between natural organic matter and colloidal silver nanoparticles in porous media." Master's thesis, Wright State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1409694849

    Chicago Manual of Style (17th edition)

wright1409694849
557
© 2014, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.