Study of Humidity Effect on Benzene Decomposition by the Dielectric Barrier Discharge Nonthermal Plasma Reactor

Abstract

The humidity effects on the benzene decomposition process were investigated by the dielectric barrier discharge (DBD) plasma reactor. The results showed that the water vapor played an important role in the benzene oxidation process. It was found that there was an optimum humidity value for the benzene removal efficiency, and at around 60% relative humidity (RH), the optimum benzene removal efficiency was achieved. At a SIE of 378 J/L, the removal efficiency was 66% at 0% RH, while the removal efficiency reached 75.3% at 60% RH and dropped to 69% at 80% RH. Furthermore, the addition of water inhibited the formation of ozone and NO2 remarkably. Both of the concentrations of ozone and NO2 decreased with increasing of the RH at the same specific input energy. At a SIE of 256 J/L, the concentrations of ozone and NO2 were 5.4 mg/L and 1791 ppm under dry conditions, whereas they were only 3.4 mg/L and 1119 ppm at 63.5% RH, respectively. Finally, the outlet gas after benzene degradation was qualitatively analyzed by FT-IR and GC-MS to determine possible intermediate byproducts. The results suggested that the byproducts in decomposition of benzene primarily consisted of phenol and substitutions of phenol. Based on these byproducts a benzene degradation mechanism was proposed.

Solar-Enhanced Plasma-Catalytic Oxidation of Toluene over a Bifunctional Graphene Fin Foam Decorated with Nanofin-like MnO2

“…. The absorption bands at 1900–1800 and 1700–1680 cm –1 can be ascribed to the stretching vibrations of CO groups in maleic anhydride and benzaldehyde, respectively. , The presence of benzoic acid is confirmed by the bands at 1650–1610, 1550, and 1350–1300 cm –1 , , whereas the absorption peaks at 1400–1350 cm –1 are related to the C–N stretching vibration . In addition, NO 2 and N 2 O are also detected (the absorption bands at 1621 and 2224 cm –1 , respectively). , …”

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

“…NTP can generate multiple types of active species, including hydrogen peroxide (H 2 O 2 ), hydroxyl radicals (•OH), ozone (O 3 ), and other chemically reactive radicals [11][12][13], which play an important role in the degradation of organics in water, soil, and the atmosphere [14][15][16]. Furthermore, dielectric barrier discharge (DBD) plasma as one of the most applied NTP technologies, can be stably generated by simple electrode configurations [17]. So, the application of DBD plasma has been deemed to be highly prospective among the various NTP techniques.…”

Performance and Pathways of Toluene Degradation over Co/13X by Different Processes Based on Nonthermal Plasma

“…The bands at 1900–1800 cm –1 are attributed to the CO stretching vibration of maleic anhydride, and features at 1400–1350 cm –1 are attributed to the C–N stretching vibration . The peaks at 1700–1680 cm –1 are assigned to the CO stretching vibration of benzaldehyde . Meanwhile, bands at 1650–1610, 1550, and 1350–1300 cm –1 are attributed to the characteristic peaks of benzoic acid. , It inferred that the primary oxidation byproducts were benzaldehyde, benzoic acid, maleic anhydride, and some nitrophenol in our experimental system.…”

“…33 The peaks at 1700−1680 cm −1 are assigned to the CO stretching vibration of benzaldehyde. 34 Meanwhile, bands at 1650−1610, 1550, and 1350− 1300 cm −1 are attributed to the characteristic peaks of benzoic acid. 35,36 It inferred that the primary oxidation byproducts were benzaldehyde, benzoic acid, maleic anhydride, and some nitrophenol in our experimental system.…”