469340 Generation of Oxidative Chemistries By Cold-Atmospheric Plasma

Monday, November 14, 2016: 1:00 PM
Union Square 13 (Hilton San Francisco Union Square)
Carly E. Anderson1, Douglas S. Clark2 and David B. Graves1, (1)Chemical & Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, (2)Chemical & Biomolecular Engineering, University of California, Berkeley, CA

Devices to produce non-thermal (“cold”) atmospheric pressure plasma, or CAP, are gaining increasing attention for their ability to inactivate bacteria and viruses1–3, and to oxidize numerous organic pollutants4 and specifically industrial dyes5,6. CAP discharges in direct contact with an aqueous solution are known to produce a cocktail of reactive oxygen and nitrogen species in solution, including OH and O2-. The type and geometry of the discharge employed, the properties of the treated solution, all affect the quantity and ratio of species produced. These factors thus play an important role in optimizing such devices for both industrial and more specialized applications.

In this work, we first examine the factors affecting the generation and transport of highly reactive species produced by cold atmospheric plasma across the plasma-liquid interface. We present the results from studies on positive and negative polarity corona discharges in which the dye indigo carmine is used as a measure of oxidation. We comment on the origin of the reactive species produced (gas phase, boundary layer, or bulk solution) and the relative importance of kinetics versus convective and diffusive forces in optimizing the modification of a target.

1. Traylor, M. J. et al. J. Phys. D. Appl. Phys. 44,(2011).
2. Pavlovich, M. J., Chang, H.-W., Sakiyama, Y., Clark, D. S. & Graves, D. B. J. Phys. D. Appl. Phys. 46,145202 (2013).
3. Aboubakr, H. a. et al. Appl. Environ. Microbiol. 81,3612–3622 (2015).
4. Jiang, B. et al. Chem. Eng. J. 236,348–368 (2014).
5. Brisset, J.-L., Benstaali, B., Moussa, D., Fanmoe, J. & Njoyim-Tamungang, E. Plasma Sources Sci. Technol. 20,034021 (2011).
6. Vautier, M. J. Catal. 201, 46–59 (2001).

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See more of this Session: Advanced Oxidation Processes II
See more of this Group/Topical: Environmental Division