Effect of copper content on the pyrolysis process of organic components in waste printed circuit boards:Based on experimental and quantum chemical DFT simulations

作     者：Bin Li Biqin Shen Ran Tao Chenwei Hu Yufeng Wu Haoran Yuan Jing Gu Yong Chen Bin Li;Biqin Shen;Ran Tao;Chenwei Hu;Yufeng Wu;Haoran Yuan;Jing Gu;Yong Chen

作者机构：Institute of Circular EconomyBeijing University of TechnologyBeijing 100124China Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2024年第73卷第9期

页      面：202-211页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Key Research and Development Program of China(2018YFC1902504) 

主　　题：Waste printed circuit boards Copper Pyrolysis Kinetic study Density functional theory(DFT) 

摘      要：In recent years,scientists have become increasingly concerned in recycling electronic trash,particularly waste printed circuit boards(WPCBs).Previous research has indicated that the presence of Cu impacts the pyrolysis of ***,there may be errors in the experimental results,as printed circuit boards(PCBs)with copper and those without copper are produced *** this experiment,we blended copper powder with PCB nonmetallic resin powder in various ratios to create the *** apparent kinetics and pyrolysis properties of four resin powders with varying copper concentrations were compared using nonisothermal thermogravimetric analysis(TG)and thermal pyrolysis-gas chromatography mass spectrometry(Py-GC/MS).From the perspective of kinetics,the apparent activation energy of the resin powder in the pyrolysis reaction shows a rise(0.1a0.2)-stable(0.2a0.4)-accelerated increase(0.4a0.8)-decrease(0.8a0.9)*** adding copper powder,the apparent activation energy changes more obviously when(0.2a0.4).In the early stage of the pyrolysis reaction(0.1a0.6),the apparent activation energy is reduced,but when a?0.8,it is much higher than that of the resin sample without ***,it is discovered using thermogravimetric analysis and Py-GC/MS that copper shortens the temperature range of the primary pyrolysis reaction and prevents the creation of compounds containing *** inhibition will raise the temperature at which compounds containing bromine first form,and it will keep rising as the copper level *** majority of the circuit board molecules have lower bond energies when copper is present,according to calculations performed using the Gaussian09 software,which promotes the pyrolysis reaction.