首页|Removal of gaseous toluene by nonthermal plasma coupled with wet scrubber containing Fe~(2+)
Removal of gaseous toluene by nonthermal plasma coupled with wet scrubber containing Fe~(2+)
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A non-thermal plasma with a wet scrubber (NTP + WS) was used to degrade gaseous toluene. Compared with the NTP + WS/H2O system, the toluene and by-product ozone removal efficiencies were increased by 10% and 85% in the NTP + WS/Fe~(2+) system, respectively. For 60 ppm toluene degradation, the maximum mineralization rate (MR) of toluene (61%) was obtained, at the optimum Fe~(2+) concentration of 50 mg/L. During catalytic oxidation, the removal efficiency of toluene was limited by its solubility in WS systems. In addition, decreased Fe~(2+) concentration and accumulation of organics led to the system deactivation. The EPR and quenching experiments verified the presence and contribution of hydroxyl radicals (4.6%) and superoxide radicals (3.8%) to the removal efficiency of toluene. Based on the radicals and intermediates detected in the gas and liquid phases, a degradation mechanism for toluene in the NTP + WS/Fe~(2+) system was proposed.
TolueneWet scrubberNonthermal plasmaOzoneFe~(2+)
Chaochao Jiang、Caihong Qin、Mengke Guo
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School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
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