Mechanochemical degradation of brominated flame retardants in waste printed circuit boards by Ball Milling.
Mechanochemical degradation of brominated flame retardants in waste printed circuit boards by Ball Milling.
复制标题
DOI：
10.1016/j.jhazmat.2019.121509
复制
发表时间：
2019-10
影响因子：
13.6
通讯作者：
Rui Wang;Zhixin Zhu;Shufei Tan;Jie Guo;Zhenming Xu
中科院分区：
文献类型：
--
作者：
Rui Wang;Zhixin Zhu;Shufei Tan;Jie Guo;Zhenming Xu
废印刷电路板中溴化阻燃剂在破碎过程中会因机械力的作用而发生降解。采用行星式球磨模拟实验研究了废弃多氯联苯中溴化阻燃剂的机械力化学脱溴过程。结果表明，CaO的脱溴效果优于MgO和Fe + SiO2的混合物，高转速和低的WPCBs/CaO质量比有利于BFR的降解。球磨1 h后，产物粒度分布趋于稳定，脱溴效率随球磨时间的增加而提高。球磨促进了溴从粉末内部向新表面的迁移，亚微米颗粒粘附在微米级团聚体上。多溴联苯醚（PBDEs）检测结果表明，随着球磨时间的延长，大多数PBDE同系物的浓度逐渐降低，并根据实验结果提出了可能的降解途径。研究结果为多氯联苯中溴化阻燃剂在机械破碎过程中的降解机理提供了新的数据。
Degradation of brominated flame retardants (BFRs) in waste printed circuit boards (WPCBs) occurred due to mechanical force during the crushing process. In this study, a planetary ball-milling simulation experiment was designed to explore the mechanochemical debromination process of BFRs in WPCBs. The results showed that CaO had a better debromination performance than MgO and the mixture of Fe + SiO2, and high revolution speed and low mass ratio of WPCBs to CaO promoted the degradation of BFRs. After milling for 1 h, the particle size distribution was stable while the debromination efficiency increased with the increase of milling time. Ball milling promoted the migration of bromine from the inside to the new surface of WPCBs powder, and submicron particles adhered to the micron size aggregates. The polybrominated diphenyl ethers (PBDEs) detection showed that the concentrations of most PBDE congeners decreased with the increase of milling time, and a possible degradation pathway was proposed according to the experimental results. All the results provided new data for the mechanism of degradation of BFRs in WPCBs during the mechanical crushing process.