Experimental Study on the Effect of Glass Beads on DBD Degradation of Sulfuryl Fluoride

SO2F2 is an inorganic compound that is colorless and odorless gas at room temperature and gas pressure. Because of its strong diffusion permeability and fast insecticidal speed, it is widely used in termite and pest control in containers, buildings, gardens and other places. However, SO2F2 is a toxic gas with strong greenhouse effect, and its emission after degradation can reduce the harm to the atmosphere and organisms. In this paper, a dielectric barrier discharge (DBD) plasma was used to degrade SO2F2, and the influence of filled glass beads on its degradation was explored. The results show that with the increase of input power, the degradation rate increases, and the energy efficiency decreases gradually. In the empty tube system without filling dielectric, the DRE of SO2F2 with a concentration of 2% reached 61.5% and the EY was 7.2 g/kWh under the condition of flow rate of 150 ml/min and power of 90 W. After filling the glass beads, the amount of charge transfer increased significantly, and the degradation rate and energy efficiency were also significantly improved. Under the condition that SO2F2 concentration was 2%, flow rate was 150 ml/min and power was 70 W, the DRE and EY of SO2F2 were 91.48% and 10.71 g/kWh, respectively. The main decomposition products of SO2F2 are SOF2, SO2, SOF4, OF2, SiF4, etc. The addition of glass beads promotes the decomposition of SO2F2 to produce more SO2 that is easy to handle, which provides a research direction for the harmless degradation of SO2F2.