Investigation of the thermal decomposition of printed circuit boards (PCBs) via thermogravimetric analysis (TGA) and analytical pyrolysis (Py-GC/MS)
Investigation of the thermal decomposition of printed circuit boards (PCBs) via thermogravimetric analysis (TGA) and analytical pyrolysis (Py-GC/MS)
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DOI：
10.1016/j.jaap.2015.08.012
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发表时间：
2015-09-01
影响因子：
6
通讯作者：
Yang, Weihong
中科院分区：
文献类型：
--
作者：
Evangelopoulos, Panagiotis;Kantarelis, Efthymios;Yang, Weihong
采用热重分析（TGA）和热解分析（Py-GC/MS）方法，对印刷电路板（PCB）废弃物在400 ~ 900 ℃温度范围内的热解行为进行了实验研究。实验结果表明，多氯联苯的化学成分和相对较高的灰分含量（= 79%w/w）与大量的金属和陶瓷材料密切相关。多氯联苯的主要分解发生在250摄氏度和370摄氏度之间。多氯联苯的热解显示出不同的芳香族化合物，如苯酚，溴苯酚，苯乙烯，甲基苯乙烯，双酚A以及非芳香族化合物，如丙酮和溴甲烷，这是密切相关的多氯联苯的初始化学成分的生产。此外，Py-GC/MS显示，温度升高有利于芳烃的生产，而苯酚，这是最丰富的化合物生产，显示出相反的趋势，作为其进一步分解为简单的产品的结果。此外，所产生的溴化化合物（如溴甲烷和溴苯酚）源自生产过程中使用的阻燃剂，在这种情况下，Py-GC/MS显示溴化化合物随温度升高而略有减少。(C)2015 Elsevier B. V.版权所有。
The purpose of this study is to experimentally investigate the pyrolytic behavior of printed circuit boards (PCBs) waste fraction at a temperature range of 400 degrees C to 900 degrees C by means of thermogravimetric analysis (TGA) and analytical pyrolysis (Py-GC/MS) was carried out. The experimental results reveal that the chemical composition of the PCBs and the relatively high ash content (=79% w/w) are strongly connected with the high quantity of metals and ceramic materials. The main decomposition of PCBs occurs between 250 degrees C and 370 degrees C. The pyrolysis of PCBs showed a varying production of aromatic compounds such as phenol, bromophenol, styrene, methylstyrene, and bisphenol A as well as non-aromatic compounds such as acetone and bromomethane, which are strongly related with the initial chemical composition of PCBs. Moreover, Py-GC/MS revealed that temperature increase favours the production of aromatic hydrocarbons, while the phenol which is the most abundant compound produced, shows an opposite trend, as a result of its further decomposition to simpler products. Furthermore, brominated compounds produced, such as bromomethane and bromophenol, are derived from the flame retardant used during the manufacturing process and in that case the Py-GC/MS showed a slight decrease of brominated compounds with increase in temperature. (C) 2015 Elsevier B.V. All rights reserved.