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- W2418768220 abstract "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 °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." @default.
- W2418768220 created "2016-06-24" @default.
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- W2418768220 date "2016-11-01" @default.
- W2418768220 modified "2023-10-18" @default.
- W2418768220 title "Synergetic inhibition of PCDD/F formation from pentachlorophenol by mixtures of urea and calcium oxide" @default.
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- W2418768220 doi "https://doi.org/10.1016/j.jhazmat.2016.05.090" @default.
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