In order to improve the intensity of plasma and the degradation efficiency of VOCs, the line-plate discharge device was used, and the porous insulating materials were attached to the low-voltage electrode, using the negative DC corona discharge to induce the surface microdischarge in the pore of insulating material on the low-voltage electrode. The effects of different insulating materials, film thickness(d), number of pores(n) and pore size(s) on the discharge characteristic and the formation of ozone were investigated to optimize the experimental parameters of the microdischarge induced by DC corona discharge system. The experimental results show that adhesion of porous insulating materials on low-voltage electrode can efficiently improve the plasma intensity compared with the uncovered electrode, among the studied materials, the porous polytetrafluoroethylene(PTFE) showed the best improvement. Increasing the number of holes in the insulating layer, decreasing the film thickness and the pore diameter can significantly enhance the discharge plasma intensity. Under the conditions of d=50 μm, n=50, s=10 μm, when the voltage is 12 kV, the discharge current is 1 296 μA, and the ozone concentration is 3.11 mg/L, which is 4.5 times and 2.2 times higher, respectively, than that of the uncovered low-voltage electrode. The microdischarge in porous PTFE on low-voltage electrode can effectively improve the degradation rate of toluene. When the voltage is 13 kV the degradation efficiency of toluene reached 58%, increased 31% compared with that of uncovered electrode.
KEY WORDS :low-voltage electrode;porous insulating film;microdischarge;discharge U-I characteristic;ozone concentration;
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