Removal of brominated flame retardant from electrical and electronic waste plastic by solvothermal technique.
Removal of brominated flame retardant from electrical and electronic waste plastic by solvothermal technique.
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DOI：
10.1016/j.jhazmat.2012.04.033
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发表时间：
2012-06
影响因子：
13.6
通讯作者：
Cong-Cong Zhang-Cong;Fu-Shen Zhang
中科院分区：
文献类型：
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作者：
Cong-Cong Zhang-Cong;Fu-Shen Zhang
电子电器(E&E)废塑料中的溴化阻燃剂具有毒性、生物累积性和顽固性。本研究对这类塑料中含有的四溴双酚A(TBBPA)进行了溶剂热处理，以获得无溴塑料。考察了甲醇、乙醇和异丙醇作为溶剂热处理的效果，发现甲醇是去除TBBPA的最佳溶剂。溶剂热处理去除TBBPA的最佳温度、时间和液固比分别为90℃、2 h和15：1。用不同的乙醇溶剂处理后，发现最终将TBBPA转移到溶剂中，萃取物中的溴被金属铜催化脱溴。脱溴后的主要产物为双酚A和溴化亚铜。溶剂热处理后，塑料的形态和FTIR性能基本保持不变，表明加工后塑料的结构保持不变。这项工作为含BFR塑料的处理提供了一种清洁、适用的工艺。
Brominated flame retardants (BFRs) in electrical and electronic (E&E) waste plastic are toxic, bioaccumulative and recalcitrant. In the present study, tetrabromobisphenol A (TBBPA) contained in this type of plastic was tentatively subjected to solvothermal treatment so as to obtain bromine-free plastic. Methanol, ethanol and isopropanol were examined as solvents for solvothermal treatment and it was found that methanol was the optimal solvent for TBBPA removal. The optimum temperature, time and liquid to solid ratio for solvothermal treatment to remove TBBPA were 90°C, 2h and 15:1, respectively. After the treatment with various alcohol solvents, it was found that TBBPA was finally transferred into the solvents and bromine in the extract was debrominated catalyzed by metallic copper. Bisphenol A and cuprous bromide were the main products after debromination. The morphology and FTIR properties of the plastic were generally unchanged after the solvothermal treatment indicating that the structure of the plastic maintained after the process. This work provides a clean and applicable process for BFRs-containing plastic disposal.