Recently,packed-bed discharge plasma technologies have been widely studied for treatment of volatile organic compounds(VOCs),due to the good performance in improving the degradation and mineralization of VOCs.In this ...Recently,packed-bed discharge plasma technologies have been widely studied for treatment of volatile organic compounds(VOCs),due to the good performance in improving the degradation and mineralization of VOCs.In this paper,a coaxial cylindrical dielectric barrier discharge reactor packed with porous material of micron-sized pores was used for degradation of benzene,and the discharge characteristics and ozone generation characteristics were studied.When the discharge length was 12 cm and the filling length was 5 cm,the packed particles in the discharge area significantly increased the number of micro-discharges,and the current amplitude and density increased with the pore size of packed particles,but the discharge power and ozone concentration showed a trend of first increasing and then decreasing.The discharge power and ozone production reached the maximum when the size of pore former was 75μm,correspondingly,the degradation efficiency of benzene was the highest.展开更多
In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different k...In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different kinds of scavenger addition, including sodium carbonate(Na_2CO_3),para benzoquinone(p-BQ), triethylenediamine and sodium dihydrogen phosphate(NaH_2PO_4),on the MB decoloration were reviewed to clarify the critical active species for the dye decoloration in the DBD plasma system. The obtained results show that higher decoloration of the MB solution could be achieved when O2 was used as the carrier gas, which could be 100% after 20 min discharge treatment, and the result confirmed the crucial effect of O_3 in the MB decoloration. Based on the experiments of the scavenger addition, it could be concluded that O_2·^- and ~1O_2 were two other important reactive oxygen species(ROS) for the MB decoloration.The results of the higher chemical oxygen demand removal and faster disappearance of the characteristic peak of the MB from the UV–vis analysis under O_2 bubbling conditions also proved the critical effect of the ROS formed by O_2 on the MB decoloration.展开更多
基金supported by National Natural Science Foundation of China(Nos.51977024,21577011)。
文摘Recently,packed-bed discharge plasma technologies have been widely studied for treatment of volatile organic compounds(VOCs),due to the good performance in improving the degradation and mineralization of VOCs.In this paper,a coaxial cylindrical dielectric barrier discharge reactor packed with porous material of micron-sized pores was used for degradation of benzene,and the discharge characteristics and ozone generation characteristics were studied.When the discharge length was 12 cm and the filling length was 5 cm,the packed particles in the discharge area significantly increased the number of micro-discharges,and the current amplitude and density increased with the pore size of packed particles,but the discharge power and ozone concentration showed a trend of first increasing and then decreasing.The discharge power and ozone production reached the maximum when the size of pore former was 75μm,correspondingly,the degradation efficiency of benzene was the highest.
基金National Natural Science Foundation of China (No. 21876070)Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment for their support of this work。
文摘In the paper, a hybrid gas–liquid dielectric barrier discharge(DBD) plasma system was set up to treat a methylene blue(MB) solution. The effects of the change of the carrier gas, the gas bubbling rate and different kinds of scavenger addition, including sodium carbonate(Na_2CO_3),para benzoquinone(p-BQ), triethylenediamine and sodium dihydrogen phosphate(NaH_2PO_4),on the MB decoloration were reviewed to clarify the critical active species for the dye decoloration in the DBD plasma system. The obtained results show that higher decoloration of the MB solution could be achieved when O2 was used as the carrier gas, which could be 100% after 20 min discharge treatment, and the result confirmed the crucial effect of O_3 in the MB decoloration. Based on the experiments of the scavenger addition, it could be concluded that O_2·^- and ~1O_2 were two other important reactive oxygen species(ROS) for the MB decoloration.The results of the higher chemical oxygen demand removal and faster disappearance of the characteristic peak of the MB from the UV–vis analysis under O_2 bubbling conditions also proved the critical effect of the ROS formed by O_2 on the MB decoloration.
