Institute of Plasma Physics - project detail 00130

Water treatment by pulsed corona discharge in combination with TiO2 photocatalysis
Project ID:	ME 541
Provider:	Ministry of Education, Youth and Sports of the Czech Republic
Period:	Sep 01, 2002 - Dec 31, 2004
Recipient -- coordinator:	Advanced Technology Group, s.r.o. -- Ing. František Peterka, Ph.D.
Co-recepient(s) / PI(s):	Institute of Plasma Physics, Czech Academy of Sciences, Prague -- Ing. Petr Lukeš, PhD.
Co-investigators from IPP	P. Šunka
Aims of the project: The pulsed high voltage discharges in water generate plasma that initiate a variety of physical and chemical effects as high electric field, intense ultraviolet radiation, overpressure shock waves and, especially, formation of various reactive chemical species acting on biological cells and chemical compounds dissolved in water. The mechanism of the degradation of organics or sterilization is attributed mainly to the oxidation by hydroxyl radicals produced directly by the discharge. The removal efficiency of the discharge can be significantly enhanced in the presence of iron due to Fenton's reaction, when hydrogen peroxide produced by the discharge reacts with ferrous ion to produce next hydroxyl radicals. However, the addition of iron to the solution may result in a new waste treatment problem involving subsequent elimination of added iron from water. The aim of the proposed project is the combination of pulsed corona discharge with TiO2 photocatalysis. We believe that by such novel method the chemical activity of the discharge can be enhanced due to TiO2-photocatalytic production of OH radicals by utilizing of UV light and H2O2 both generated by the discharge, and, in addition, without need of any additives to the solution. Through cooperation with Japanese partners specialized on TiO2 photocatalysis research we propose development of a new electrode with photoactive TiO2 layer. Testing of chemical effects of the corona discharge process combined with TiO2 photocatalysis and the comparison with results obtained for the corona discharge without TiO2 will be made.
Progress/Results: It was found that in the presence of photocatalytically active titanium oxide it is possible to enhance efficiency of plasmachemical activity of pulsed corona discharge in water. This was proved on the higher removal efficiency of phenol from water by the discharge in combination with TiO2. The main effect of TiO2 addition was in the utilizing of ultraviolet radiation from the plasma resulting in the photocatalytic formation of OH radicals on the surface of TiO2 particles and, thus, in the increase of the yield of OH radicals available for phenol degradation.
Results:
Lukeš P., Člupek M., Šunka P., Peterka F., Sano T., Negishi N., Matsuzawa S., Takeuchi K.: Degradation of phenol by underwater pulsed corona discharge in combination with TiO2 photocatalysis. Research on Chemical Intermediates 31 [4-6] (2005) 285-294. [NIMS International Conference on Photocatalysis: Fundamentals and Applications/2nd./. Shonan Village Center, Hayama, Kanagawa, Japonsko, 01.02.2004-03.02.2005]
Lukeš P., Člupek M., Šunka P., Peterka F., Sano T., Negishi N., Matsuzawa S., Takeuchi K.: Water treatment by non-thermal plasma in combination with TiO2 photocatalysis. Photocatalysis 10 [12] (2003) 196-197. [Symposium on Recent Advances in Photocatalysis/10th./. Tokyo, 10.12.2003]
Peterka F., Jirkovský J., Kavan L., Šubrt J., Štengl V., Balek V., Lukeš P., Krýsa J.: Czech contribution to Japanese-European cooperation on the TiO2 photocatalytic application field. Photocatalysis 10 [12] (2003) 228-229. [Symposium on Recent Advanced in Photocatalysis/10th./. Tokyo, 10.12.2003]
Peterka F., Kavan L., Balek V., Šubrt J., Štengl V., Lukeš P., Krýsa J., Jirkovský J.: Methods and problems of testing TiO2 photocatalytic products and standardization. Photocatalysis 9 [12] (2002) 194-195. [Symposium on Recent Advances in Photocatalysis /9./. Tokio, 02.12.2002]
Lukeš P., Člupek M., Šunka P., Peterka F., Sano T., Negishi N., Matsuzawa S., Takeuchi K.: Degradation of phenol by underwater pulsed corona discharge in combination with TiO2 photocatalysis. 2nd NIMS International Conference on Photocatalysis: Fundamentals and Applications-Abstracts. Kanawaga : Shonan Village Center, Hayama, Kanawaga, 2004. s. 103-103. [NIMS International Conference on Photocatalysis:Fundamentals and Applications/2nd./. Shonan Village Center, Hayama, Kanawaga (JP), 01.02.2004-03.02.2004]
Lukeš P., Člupek M., Šunka P., Peterka F., Sano T., Negishi N., Matsuzawa S., Takeuchi K.: Degradation of phenol by pulsed corona discharge in combination with TiO2 photocatalysis. Proceedings of 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications. Barcelona, 2004. s. 301-302. [European Meeting on Solar Chemistry and Photocatalysis:Enviromental Applications/3rd./. Barcelona (ES), 30.06.2004-02.07.2004]
Peterka F., Jirkovský J., Kavan L., Šubrt J., Štengl V., Balek V., Lukeš P., Krýsa J.: Standardization of testing methods on TiO2 photocatalytic application field. : Proceedings of 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications. Barcelona : Univeritat Barcelona, 2004. s. 311-312. [European Meeting on Solar Chemistry and Photocatalysis:Enviromental Applications/3rd./. Barcelona (ES), 30.06.2004-02.07.2004]
Lukeš P., Člupek M., Šunka P., Babický V., Janda V.: Generation of UV light by pulsed corona discharge in water. The Eighth International Conference on Advanced Oxidation Technologies for Water and Remediation-Abstracts. Toronto, 2002. s. 81-81. [The Eighth International Conference on Advanced Oxidation Technologies for Water and Air Remediation. Toronto, Ontario (CA), 17.11.2002-21.11.2002]