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- W3136357096 abstract "Waste printed circuit boards (WPCBs) are not only valuable recourses but also hazardous materials. Mechanical crushing is an essential pretreatment for WPCB recycling. Polybrominated diphenyl ethers (PBDEs) are released during the crushing of WPCBs; however, the release and transformation mechanism of PBDEs has been hardly reported. In this study, the results of the experimental monitoring and theoretical simulation of carriers during the crushing were used to explain the transformation mechanism of PBDEs. The experimental results showed that the increase of the carrier size promoted the debromination of PBDEs, and the content of PBDE congeners was related to the size of carriers. The results of the simulation estimated that the energy of carriers was positively related to the carrier size. These results indicated that the energy promoted the transformation of PBDEs. According to the theory of bond energy, the bond energy of C–Br bonds in BDE-28 was about 300 kJ/mol, which was lower than that of BDE-28, and the theory of electronegativity showed BDE-3 was easier to be formed from BDE-8. From theoretical analysis, the main debromination pathway of BDE-100 was changed from BDE-100 → BDE-47 → BDE-17 → BDE-7 → BDE-1 to BDE-100 → BDE-47 → BDE-28 → BDE-8 → BDE-3 with the decrease of energy. The release rules of PBDEs obtained by this mechanism in carriers of different sizes were consistent with the results of experimental monitoring. This study provides the theory and guidance for the release and transformation of PBDEs during the crushing of WPCBs." @default.
- W3136357096 created "2021-03-29" @default.
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- W3136357096 date "2021-03-23" @default.
- W3136357096 modified "2023-10-15" @default.
- W3136357096 title "Reveal the Release and Transformation Mechanism of Polybrominated Diphenyl Ethers during the Crushing of Waste Printed Circuit Boards Based on the Experimental Monitoring and Theoretical Simulation" @default.
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- W3136357096 doi "https://doi.org/10.1021/acssuschemeng.1c00962" @default.
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