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题名: Synergetic inhibition of PCDD/F formation from pentachlorophenol by mixtures of urea and calcium oxide
作者: Li, Qianqian; Li, Liewu; Su, Guijin; Huang, Xinchen; Zhao, Yanhui; Li, Binke; Miao, Xue; Zheng, Minghui
刊名: JOURNAL OF HAZARDOUS MATERIALS
出版日期: 2016-11-05
卷号: 317, 期号:0, 页码:394-402
关键词: PCDD/Fs ; Urea ; CaO ; Pentachlorophenol ; Synergetic suppression
DOI: 10.1016/j.jhazmat.2016.05.090
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: Chlorophenols are structurally similar to PCDD/Fs and have been considered as highly potential precursors for PCDD/Fs formation. The suppressing effects of PCDD/F formation from pentachlorophenol (PCP) were investigated on various mass ratios of CaO and urea. The total concentration of 2,3,7,8-PCDD/Fs, mostly dominated by OCDD, was determined to be 48.58-10186 ng/mg in inhibitor-reaction systems, being much lower than that in blank reaction system (75654 ng/mg). Interestingly, compared with pure CaO and urea reaction system, the concentration and TEQ of formed 2,3,7,8-PCDD/Fs in mixed urea/CaO reaction system were lower, especially with 5-20% urea reaction systems being respectively at decrease by 96.5-99.4% and 99.2-99.7%. The suppression efficiency of TEQ in 5-20% urea reaction systems could be always approximately 100% under 250-350 degrees C. These results suggested that mixed inhibitors, especially 5-20% urea inhibitors, have a synergetic inhibition effect for PCDD/Fs formation from PCP. Mixed inhibitor generated several intermediates, involving CO2, H2O, NH3, Ca(OH)(2), CaCO3, HNCO, biuret and ammelide. The complex between PCP and Ca, N-doped species, lower chlorinated phenols and benzenediol, and organic acids were also determined. Synergetic inhibition mechanism may be attributed to accelerated facilitation of acid-base reaction and N doping. The decomposition of PCP itself also contributes to prevent PCDD/Fs formation. (C) 2016 Elsevier B.V. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35956
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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Recommended Citation:
Li, Qianqian,Li, Liewu,Su, Guijin,et al. Synergetic inhibition of PCDD/F formation from pentachlorophenol by mixtures of urea and calcium oxide[J]. JOURNAL OF HAZARDOUS MATERIALS,2016,317(0):394-402.
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