Decomposition of benzene by plasma reactor

• 1、College of Environmental and Energy Engineering, Beijing University of Technology
• 2、College of Environmental and Energy Engineering, Beijing
• 3、Department of Environmental Engineering,Xi’an University

Abstract：The traditional methods of VOCs degradation which were referred to the new environmental condition had many disadvantages. In these years, some new technologies, such as biologic process, photocatalysis process, and plasma technology, were paid more and more attention. Especially, photocatalysis technology of nanometer TiO2 got extensive studies because of low energy consume and strong oxidation capability. Synergistic effect of atmospheric non-thermal plasma generated by dielectric barrier discharge (DBD) and nano-TiO2 photocatalyst on benzene decomposition was tested. Nano-TiO2 sol was done as photocatalyst, which was coated on the surface of rasching rings. The paper indicated the effect of photocatalyst on removal efficiency of benzene, the compare of photocatalyst characteristic in different high temperatures by heat treatment, the effect of humidity on photocatalyst characteristic, and the effect of inactivation and reactivation of photocatalyst on removal efficiency. The results showed that the effect of degradation was visible by added photocatalyst in the plasma reactor. When concentration of benzene was 600 mg/m3 and electrostatic field strength was 9 kV/cm, the removal efficiency of benzene was increased up to 80%. When concentration of benzene was 1500 mg/m3 and electrostatic field strength was 12 kV/cm, the removal efficiency was increased 19% higher with photocatalyst than without photocatalyst. Nano-TiO2 crystal was anatase crystal in 450℃ heat treatment. While the photocatalysis characteristic of anatase crystal was best and degradation efficiency was up to 99%.

Keywords： nanometer TiO2 photocatalyst dielectic barrier discharge the plasma reactor