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DeJesus_Jenny_P_OhioLINK_12_14_17.pdf (3.47 MB)

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HEAVY METAL DETECTION IN AQUEOUS ENVIRONMENTS USING SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS)

De Jesus, Jenny Padua
http://rave.ohiolink.edu/etdc/view?acc_num=miami1513185193940902

Abstract Details

2017, Doctor of Philosophy, Miami University, Chemistry and Biochemistry.
We illustrate in Chapter 1 the use of surface-enhanced Raman spectroscopy (SERS) as a molecule-specific probe targeting the detection of mercury ion (Hg2+), copper ion (Cu2+), and lead ion (Pb2+) in aqueous and buffered solutions. The determination of heavy metal ions was achieved by employing 4-mercaptobenzoic acid (pMBA) as the coordination ligand tethered on a SERS active substrate composed of silver nanoparticles (AgNP). Upon interaction with the metal cations, spectroscopic modifications such as changes in peak intensity ratios and peak shifts observed in the SERS spectrum of pMBA were taken as indicators of heavy metal coordination. In Chapter 2, we confirm the occurrence of Ostwald ripening in pMBA-functionalized silver nanoparticles. We evaluated different parameters, such as light exposure and temperature that may influence this process via UV-visible spectroscopy, dynamic light scattering (DLS), inductively coupled plasma mass spectrometry (ICP-MS), and surface enhanced Raman scattering (SERS) measurements. Chapter 3 centers on the study of the ionization behavior of 4-mercaptobenzoic acid (pMBA) immobilized on the surface of silver nanoparticles (AgNP). The titration method was performed via SERS and the titration curves were generated by plotting the intensities of the pMBA bands that were responsive to changes in pH of the solution. The percent ionization of pMBA at each stage in the titration process as well as the surface pKa of the molecule were determined in lactic acid, propionic acid, boric acid, and phenol buffer systems.
Andre Sommer (Advisor)
Neil Danielson (Committee Chair)
Carole Dabney-Smith (Committee Member)
Michael Crowder (Committee Member)
Jason Berberich (Committee Member)
343 p.
Chemistry
Heavy metal detection; Surface enhanced Raman spectroscopy; Ostwald ripening; SERS titration

Recommended Citations

Citations

  • De Jesus, J. P. (2017). HEAVY METAL DETECTION IN AQUEOUS ENVIRONMENTS USING SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS) [Doctoral dissertation, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1513185193940902

    APA Style (7th edition)

  • De Jesus, Jenny. HEAVY METAL DETECTION IN AQUEOUS ENVIRONMENTS USING SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS). 2017. Miami University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1513185193940902.

    MLA Style (8th edition)

  • De Jesus, Jenny. "HEAVY METAL DETECTION IN AQUEOUS ENVIRONMENTS USING SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS)." Doctoral dissertation, Miami University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1513185193940902

    Chicago Manual of Style (17th edition)

miami1513185193940902
501
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This open access ETD is published by Miami University and OhioLINK.