摘要
十溴联苯醚(BDE-209)热解过程中容易产生毒性较高的低溴代联苯醚和溴代二噁英,氧化锌对BDE-209的热解过程及热解产物有较大地影响.利用差热-热重(DTA-TG)分析,X线衍射(XRD)分析和GC、GC/MS对热解产物种类以及相对含量进行分析,结果表明:氧化锌的加入降低了BDE-209热降解反应的活化能,从而降低了BDE-209的热降解温度;氧化锌加入后,BDE-209在400℃时热解产生的溴代二噁英较多;BDE-209和氧化锌以2.4∶1(质量比)在400℃进行热降解,其降解率2 h达到100%,此时,六溴代和七溴代二噁英类产物相对含量较低,六溴苯和五溴苯类产物的相对含量最高.结合Arrhenius公式计算以及软硬酸碱理论,并根据热解残余物的XRD产物分析,对BDE-209和氧化锌的混合热解机理进行了深入探讨,为热处理废旧印刷电路板的污染防控提供了理论依据.
Low brominated diphenyl ethers and brominated dioxins with high toxicity were easily produced in the pyrolysis process of decabromodiphenyl ethers,Based on this,the pyrolysis process of BDE-209 and ZnO was studied by differential thermal gravimetric analysis(DTA-TG),X-ray diffraction(XRD),GC and GC/MS.The results showed that the addition of zinc oxide reduced the activation energy of BDE-209 thermal degradation reaction,thus reducing the thermal degradation temperature of BDE-209;after the addition of zinc oxide,BDE-209 pyrolysis produced more brominated dioxins at 400℃When BDE-209 and ZnO were degraded at 400℃at 2.4∶1(m/m),the degradation rate reached 100%at 2 h.At this time,the relative content of hexabromo to heptabromo-dioxins was lower,and the relative content of hexabromobenzene to pentabromobenzene was the highest.Combined with Arrhenius formula calculation,soft and hard acid-base theory and XRD product analysis of pyrolysis residue,the mixed pyrolysis mechanism of BDE-209 and zinc oxide was deeply discussed,which provided a theoretical basis for pollution prevention and control of waste printed circuit boards in heat treatment.
作者
高兰
雷源
李占圣
刘芃岩
GAO Lan;LEI Yuan;LI Zhansheng;LIU Pengyan(College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;College of Biochemical and Environmental Engineering,Baoding University, Baoding 071001, China;School of Eco-Environment,Hebei University,Baoding 071002,China)
出处
《河北大学学报（自然科学版）》
CAS
北大核心
2022年第1期29-37,共9页
Journal of Hebei University(Natural Science Edition)
基金
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)
河北省高等学校科技研究指导项目(ZC2016148)
保定学院转型发展研究基金资助项目(2015Z06)。
