Dielectric barrier discharge plasma coupled with WO for bisphenol A degradation.

Based on the difficulty of the refractory organic compounds degradation in water by the traditional wastewater treatment methods, the research relies on the technology of the dielectric barrier discharge plasma (DBDP) and the catalysis of the nano WO, investigating the bisphenol A (BPA) degradation in the synergistic system of DBDP/WO. The coupled degradation percentage of the BPA under different amounts of WO addition, different initial solution pH and carrier gas were investigated to confirm the catalysis of the WO in the DBDP system. It was obtained from the experimental results that the optimal additive amount of the WO was 175 mg L and change of the solution pH value and the carrier gas variety could not change the catalysis of the WO. The BPA degradation percentage could reach 100% after treating 30 min in the DBDP/WO system with 0.5 L min O as the carrier gas. The WO still had a better catalysis after four times usage and the discharge had little effect on the microstructure of the WO. The existence of the WO in the DBDP system could result in the reduction of the O concentration and the enhancement of the HO concentration, which improve the catalysis of the WO in the DBDP system, while the experiments on the scavengers' addition verified the major role of the OH on the BPA degradation. The catalytic mechanism of the WO as well as the BPA degradation pathway was also speculated in the research.