Effect of metals and brominated flame retardants on thermal degradation kinetics of waste printed circuit board

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-04-14 DOI:10.1016/j.tca.2024.179747

Bibari Boro, Pankaj Tiwari

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Abstract

Waste printed circuit board (WPCB) is an indispensable component in any waste electrical and electronic equipment (WEEE). A promising method for recycling WPCB is pyrolysis. To understand the effect of metals and brominated flame retardants (BFR) on WPCB pyrolysis, four samples were prepared, namely (a) raw WPCB (RW), (b) non-metallic WPCB (NM), (c) bromine extracted WPCB (RW_{BFR_ext}) and (d) bromine and metal extracted WPCB (NM_{BFR_ext}). The degradation kinetics study using the isoconversional methods: Friedman, Ozawa-Flynn-Wall (OFW), Kissinger–Akahira–Sunose (KAS), and Starink showed that the extraction of metals exhibited an increase in final degradation temperature and activation energy (E_α), and altered the reaction mechanism (f(a)) whereas, the reduction of BFR reduced initial degradation temperature. The identified kinetic triplets were verified using the reconstruction profiles. The parameters can be used in designing applications and developing an energy-efficient pyrolysis process.

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金属和溴化阻燃剂对废印刷电路板热降解动力学的影响

废印刷电路板（WPCB）是所有废弃电气和电子设备（WEEE）中不可或缺的组成部分。回收 WPCB 的一种可行方法是热解。为了了解金属和溴化阻燃剂（BFR）对 WPCB 热解的影响，我们制备了四种样品，即（a）原 WPCB（RW）、（b）非金属 WPCB（NM）、（c）溴提取 WPCB（RWBFR_ext）和（d）溴和金属提取 WPCB（NMBFR_ext）。降解动力学研究采用的是等转化法：Friedman、Ozawa-Flynn-Wall (OFW)、Kissinger-Akahira-Sunose (KAS) 和 Starink 等方法进行的降解动力学研究表明，金属萃取会提高最终降解温度和活化能 (Eα)，并改变反应机理 (f(a))，而溴化阻燃剂的减少会降低初始降解温度。利用重构剖面验证了已确定的动力学三元组。这些参数可用于设计应用和开发高能效热解工艺。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes