Article

Degradation of methylene blue by radio frequency plasmas in water under ultraviolet irradiation.

Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.
Journal of hazardous materials (impact factor: 4.14). 09/2009; 174(1-3):473-6. DOI:10.1016/j.jhazmat.2009.09.076 pp.473-6
Source: PubMed

ABSTRACT 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.

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Keywords

degradation
 
enhancement
 
hydrogen peroxide
 
mercury vapor
 
mercury vapor lamp
 
methylene blue
 
methylene blue solution
 
photolysis process degrade methylene blue
 
power supply
 
radio frequency
 
recombination process
 
stray RF power
 
ultraviolet
 
weak UV light
 

Tsunehiro Maehara