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Abstract:
Volatile organic pollutants in mist are becoming of great concern around the world. In the present study, removal of p-chlorophenol (4-CP) in mist by corona discharge plasma was investigated using a link tooth wheel-cylinder plasma reactor energized by a positive DC power supply. The results indicate that the corona discharge is effective in removal of 4-CP in mist. The removal of 4-CP and TOC (total organic carbon) improves as input power increases. With the help of Gaussian03 package program combined with frontier orbital theory and density functional theory, it was speculated that 4-chlorocatechol was the dominating hydroxylated intermediate and C-CI would be initially attacked by the plasma species to form CI-due to its longest bond length, which is verified by HPLC and IC analysis results of 4-CP degradation products. Most of the chlorine atoms are released from the removed 4-CP to form CI-. The CI- takes up more than 93% while the 4-chlorocatechol accounts for less than 1% of the reacted chlorine. The ring-opening (maleic and oxalic acids) and ring-containing products (mainly 4-chlorocatechol) account for less than 50% and 1% of the converted carbon respectively under the investigated conditions, with the other converted carbon being contained in inorganic products such as CO2 and CO. Both short-living and long-living plasma species contribute to 4-CP degradation. Based on the analysis of 4-CF degradation products and the roles of active species in 4-CP degradation, possible pathways of 4-CP degradation in mist were proposed. (C) 2014 Elsevier B.V. All rights reserved.
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CHEMICAL ENGINEERING JOURNAL
ISSN: 1385-8947
Year: 2014
Volume: 245
Page: 41-46
1 5 . 1 0 0
JCR@2022
ESI Discipline: ENGINEERING;
ESI HC Threshold:176
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 21
SCOPUS Cited Count: 30
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0