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碱性及含硫化合物对十溴联苯醚热降解的影响
Influence of alkaline and sulfur-containing compounds on the thermal degradation of decabromodiphenyl ether
将十溴联苯醚（BDE-209）于400~600℃的温度范围内进行热降解，利用GC、GC/MS对产物种类及含量变化进行分析，讨论了温度、时间、碱性化合物和含硫化合物对BDE-209降解以及对溴代二噁英生成的影响.结果表明.温度和时间均是BDE-209热降解和生成溴代二噁英的重要影响因素；热降解40min时，450℃条件下溴代二噁英生成量最多；产物种类证实碱性化合物通过与BDE-209脱溴形成的HBr反应促进降解，且可抑制二噁英的生成；含硫化合物的添加同样促进BDE-209降解，抑制二噁英的形成，其详细的抑制机理有待进一步确定，BDE-209的降解反应有两种情况，即苯环上的脱溴反应和醚键的断裂反应.
The thermal degradation of decabromodiphenyl ether (BDE-209) was studied at the temperature range of 400~600℃. The types and contents of its degradation products were determined using GC and GC/MS techniques. The effects of temperature, time, and alkaline- and sulfur-containing compounds on the thermal degradation of BDE-209, as well as the formation of brominated dioxins, were discussed in this study. The results showed that both temperature and time were the two key factors for both the thermal degradation of BDE-209 and the formation of brominated dioxins. When BDE-209 was pyrolyzed at 450℃ for 40minutes, the brominated dioxins were generated to the maximum extent. The types of the products confirmed that alkaline compounds promoted the thermal degradation of BDE-209 by reaction with HBr formed from the BDE-209 debromination, and inhibited the formation of dioxins. Similarly, the sulfur compounds also promoted the degradation of BDE-209 and inhibited the formation of dioxins. However, the detailed inhibition mechanism needs to be further investigated in the future study. There are two kinds of degradation reactions for BDE-209, namely, debromination of phenyl rings and cleavage of ether bond. This research may provide a theoretical basis for the safe disposal of BDE-209-contained products and the reduction of secondary pollution.
含硫化合物 / 碱性化合物 / 热降解 / 十溴联苯醚 / 溴代二噁英
alkaline compounds / brominated dioxins / decabromodiphenyl ether (BDE-209) / sulfur-containing compounds / thermal degradation
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国家自然科学基金资助项目（21377033）；河北省自然科学基金资助项目（B2018201224）；河北省教育厅重点项目（ZD20131046）
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