Degradation of aqueous Rhodamine B by plasma generated along the water surface and its enhancement using nanocrystalline Fe-, Mn-, and Ce-doped TiO₂ films.
The degradation of aqueous Rhodamine B (RhB) was examined using a dual-channel spark switch module designed to regulate the steepness of pulsed high voltage with microsecond rise time. Depending on the energy per pulse, a spark along the water surface (SPWS) or streamer along the water surface (STWS) was formed. STWS was found to have a better degradation effect and energy efficiency toward RhB than SPWS at the same power; however, addition of H₂O₂ amounts resulted in increased degradation, the effect being more pronounced using SPWS. The initial concentration of RhB also appeared to influence the rate constant of the degradation reaction. Furthermore, TiO₂ films doped with Fe, Mn, and Ce were found to enhance the degradation performance of plasma. A possible reaction mechanism of plasma formation along the water surface was concluded by determination of the main inorganic products in the liquid and gas phases.
Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, Industrial Ecology and Environment Research Institute, Zhejiang University, Hangzhou, 310000, People's Republic of China.
Yongduo
Y
Chen
Yang
Y
Li
Anna
A
Zhu
Yifan
Y
Huang
Zhen
Z
Liu
Keping
K
Yan
D002563:Cerium / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007501:Iron / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D012235:Rhodamines / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D004396:Coloring Agents; D012235:Rhodamines; D014874:Water Pollutants, Chemical; D014867:Water; C009495:titanium dioxide; D002563:Cerium; D008345:Manganese; D014025:Titanium; D007501:Iron; C029773:rhodamine B