Degradation of 4-Chlorophenol using a Gas–Liquid Gliding Arc Discharge Plasma Reactor |
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Authors: | Ch M Du J H Yan B G Cheron |
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Institution: | (1) School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China;(2) Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China;(3) UMR 6614 (CORIA), University of Rouen, 76821 Mont Saint Aignan, France |
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Abstract: | The gas–liquid gliding arc discharge plasma is used directly to study degradation and dechlorination of 4-Chlorophenol (4-CP)
in solution. The typical AC waveforms of discharge voltage and current revealed that the discharge behavior was not definitely
periodic. The chemical oxygen demand (COD) abatement of 4-CP solution with stainless steel electrode is higher than that with
aluminum or brass electrode; When air was used as carrier gas the COD abated from 1,679.2 to 190 mg/L (i.e., 88.68% abatement)
after 76 min plasma treatment; Increasing gas–liquid mixing rate could also increase the degradation of 4-CP; adding appropriate
amounts of Fe2+ or iron chips to the solution were found to be favorable for 4-CP degradation. The main intermediates of 4-CP degradation
are p-benzoquinone, hydroquinone, 4-chlorocatechol, p-chloronitrobenzene, and ring cleavage products (acetic acid, glycol,
propanone, and others). Furthermore, possible pathways of 4-CP degradation in solution are proposed. |
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Keywords: | Gliding arc discharge Plasma 4-Chlorophenol (4-CP) Degradation |
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