9:30 AM - 9:45 AM
△ [21a-W621-3] Degradation of aqueous 2,6-dibromophenol solution by in-liquid dielectric barrier micro-plasma
Keywords:plasma degradation,atmosphelic pressure plasma,in-liquid plasma
Tetrabromobisphenol A (TBBPA), a fireproofing material, is attracting increasing concern as a source of 2,6-dibromophenol (2,6-DBP) known as an endocrime disrupter. In this study, we aimed an experimental comparison of he water remediation effect between the liquid immersed micro-Dielectric Barrier Discharge plasma torch with formally studied UV and surface steamer discharge degradation. A W-Re wire electrode in a coaxial quartz tube was polarized with high voltage pseudo-sine wave, maximum voltage 5 kV at the frequency of 16 kHz. The outer dielectric electrode was connected to the ground potential through an electrostatic coupling across the glass vessel. 100 mL of the aqueous solution of 2,6-DBP solution was sampled and degraded with the immersed plasma torch. The highest degradation rate was observed using oxygen or oxygen mixture. In 5 minutes, degradation rate was 98.8%, with worink gas air. The decomposition of the total organic carbon (TOC) to 0 mg/L was observed in the case of oxygen discharge in 30 minutes. This result indicates the primary part of the degradation should be attributed to the excited oxygenic compound such as ozone.