Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 317, Issue -, Pages 188-197Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.05.053
Keywords
Pulsed plasma discharge; Water film gas-liquid reactor; Post plasma reactions; Methylene blue decoloration; Fenton reaction
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Funding
- FAMU-FSU College of Engineering, Department of Chemical and Biomedical Engineering
- National Science Foundation [CBET 0932481, CBET 1236225]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1236225] Funding Source: National Science Foundation
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A pulsed electrical discharge plasma formed in a tubular reactor with flowing argon carrier gas and a liquid water film was analyzed using methylene blue as a liquid phase hydroxyl radical scavenger and simultaneous measurements of hydrogen peroxide formation. The effects of liquid flow rate, liquid conductivity, concentration of dye, and the addition of ferrous ion on dye decoloration and degradation were determined. Higher liquid flow rates and concentrations of dye resulted in less decoloration percentages and hydrogen peroxide formation due to initial liquid conductivity effects and lower residence times in the reactor. The highest decoloration energy yield of dye found in these studies was 5.2 g/kWh when using the higher liquid flow rate and adding the catalyst. The non-homogeneous nature of the plasma discharge favors the production of hydrogen peroxide in the plasma-liquid interface over the chemical oxidation of the organic in the bulk liquid phase and post-plasma reactions with the Fenton catalyst lead to complete utilization of the plasma-formed hydrogen peroxide. (C) 2016 Elsevier B.V. All rights reserved.
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