Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 174, Issue 1-3, Pages 473-476Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.09.076
Keywords
RF plasma; Methylene blue; Degradation; Ultraviolet; Photolysis; Hydrogen peroxide
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20360098]
- Grants-in-Aid for Scientific Research [20360098] Funding Source: KAKEN
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The degradation of methylene blue by radio frequency (RF) plasmas in water under ultraviolet (UV) irradiation was studied experimentally. When the methylene blue solution was exposed to RF plasma, UV irradiation from a mercury vapor lamp enhanced degradation significantly. A lamp without power supply also enhanced degradation since weak UV light was emitted weakly from the lamp due to the excitation of mercury vapor by stray RF power. Such an enhancement is explained by the fact that after hydrogen peroxide is produced via the recombination process of OH radicals around the plasma, OH radicals reproduced from hydrogen peroxide via the photolysis process degrade methylene blue. (C) 2009 Elsevier B.V. All rights reserved.
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