Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine

Research output: Contribution to journalArticleScientificpeer-review

Standard

Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine. / Xiong, Jingjing; Yu, Shaoqi; Wu, Daidai; Lu-Tervola, Xiaoshu; Tang, Junhong; Wu, Weihong; Yao, Zhitong.

In: Waste management and Research, 06.01.2020, p. 1-8.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

APA

Vancouver

Author

Xiong, Jingjing ; Yu, Shaoqi ; Wu, Daidai ; Lu-Tervola, Xiaoshu ; Tang, Junhong ; Wu, Weihong ; Yao, Zhitong. / Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine. In: Waste management and Research. 2020 ; pp. 1-8.

Bibtex - Download

@article{bf2acb67dce8473fa0fef2270b0976fa,
title = "Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine",
abstract = "Advanced thermal treatment of electronic waste offers advantages of volume reduction and energy recovery. In this work, the pyrolysis behaviour of nonmetallic fractions of waste printed circuit boards was studied. The fate of a bromine and thermal decomposition pathway of nonmetallic fractions of waste printed circuit boards were further probed. The thermogravimetric analysis showed that the temperatures of maximum mass loss were located at 319°C and 361°C, with mass loss of 29.6{\%} and 50.6{\%}, respectively. The Fourier transform infrared Spectroscopy analysis revealed that the spectra at temperatures of 300°C–400°C were complicated with larger absorbance intensity. The nonmetallic fractions of waste printed circuit boards decomposed drastically and more evolved products were detected in the temperature range of 600°C–1000°C. The gas chromatography–mass spectrometry analysis indicated that various brominated derivates were generated in addition to small molecules, such as CH4, H2O and CO. The release intensity of CH4 and H2O increased with temperature increasing and reached maximum at 600°C–800°C and 400°C–600°C. More bromoethane (C2H5Br) was formed as compared with HBr and methyl bromide (CH3Br). The release intensity of bromopropane (C3H7Br) and bromoacetone (C3H5BrO) were comparable, although smaller than that of bromopropene (C3H5Br). More dibromophenol (C6H4Br2O) was released than that of bromophenol (C6H5BrO) in the thermal treatment. During the thermal process, part of the ether bonds first ruptured forming bisphenol A, propyl alcohol and tetrabromobisphenol A. Then, the tetrabromobisphenol A decomposed into C6H5BrO and HBr, which further reacted with small molecules forming brominated derivates. It implied debromination of raw nonmetallic fractions of waste printed circuit boards or pyrolysis products should be applied for its environmentally sound treating.",
keywords = "electronic waste, waste printed circuit borads, brominated flamen retardant, flame retardant plastics, pyrolysis",
author = "Jingjing Xiong and Shaoqi Yu and Daidai Wu and Xiaoshu Lu-Tervola and Junhong Tang and Weihong Wu and Zhitong Yao",
year = "2020",
month = "1",
day = "6",
doi = "10.1177/0734242X19894621",
language = "English",
pages = "1--8",
journal = "Waste management and Research",
issn = "0734-242X",
publisher = "SAGE Publications Ltd",

}

RIS - Download

TY - JOUR

T1 - Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine

AU - Xiong, Jingjing

AU - Yu, Shaoqi

AU - Wu, Daidai

AU - Lu-Tervola, Xiaoshu

AU - Tang, Junhong

AU - Wu, Weihong

AU - Yao, Zhitong

PY - 2020/1/6

Y1 - 2020/1/6

N2 - Advanced thermal treatment of electronic waste offers advantages of volume reduction and energy recovery. In this work, the pyrolysis behaviour of nonmetallic fractions of waste printed circuit boards was studied. The fate of a bromine and thermal decomposition pathway of nonmetallic fractions of waste printed circuit boards were further probed. The thermogravimetric analysis showed that the temperatures of maximum mass loss were located at 319°C and 361°C, with mass loss of 29.6% and 50.6%, respectively. The Fourier transform infrared Spectroscopy analysis revealed that the spectra at temperatures of 300°C–400°C were complicated with larger absorbance intensity. The nonmetallic fractions of waste printed circuit boards decomposed drastically and more evolved products were detected in the temperature range of 600°C–1000°C. The gas chromatography–mass spectrometry analysis indicated that various brominated derivates were generated in addition to small molecules, such as CH4, H2O and CO. The release intensity of CH4 and H2O increased with temperature increasing and reached maximum at 600°C–800°C and 400°C–600°C. More bromoethane (C2H5Br) was formed as compared with HBr and methyl bromide (CH3Br). The release intensity of bromopropane (C3H7Br) and bromoacetone (C3H5BrO) were comparable, although smaller than that of bromopropene (C3H5Br). More dibromophenol (C6H4Br2O) was released than that of bromophenol (C6H5BrO) in the thermal treatment. During the thermal process, part of the ether bonds first ruptured forming bisphenol A, propyl alcohol and tetrabromobisphenol A. Then, the tetrabromobisphenol A decomposed into C6H5BrO and HBr, which further reacted with small molecules forming brominated derivates. It implied debromination of raw nonmetallic fractions of waste printed circuit boards or pyrolysis products should be applied for its environmentally sound treating.

AB - Advanced thermal treatment of electronic waste offers advantages of volume reduction and energy recovery. In this work, the pyrolysis behaviour of nonmetallic fractions of waste printed circuit boards was studied. The fate of a bromine and thermal decomposition pathway of nonmetallic fractions of waste printed circuit boards were further probed. The thermogravimetric analysis showed that the temperatures of maximum mass loss were located at 319°C and 361°C, with mass loss of 29.6% and 50.6%, respectively. The Fourier transform infrared Spectroscopy analysis revealed that the spectra at temperatures of 300°C–400°C were complicated with larger absorbance intensity. The nonmetallic fractions of waste printed circuit boards decomposed drastically and more evolved products were detected in the temperature range of 600°C–1000°C. The gas chromatography–mass spectrometry analysis indicated that various brominated derivates were generated in addition to small molecules, such as CH4, H2O and CO. The release intensity of CH4 and H2O increased with temperature increasing and reached maximum at 600°C–800°C and 400°C–600°C. More bromoethane (C2H5Br) was formed as compared with HBr and methyl bromide (CH3Br). The release intensity of bromopropane (C3H7Br) and bromoacetone (C3H5BrO) were comparable, although smaller than that of bromopropene (C3H5Br). More dibromophenol (C6H4Br2O) was released than that of bromophenol (C6H5BrO) in the thermal treatment. During the thermal process, part of the ether bonds first ruptured forming bisphenol A, propyl alcohol and tetrabromobisphenol A. Then, the tetrabromobisphenol A decomposed into C6H5BrO and HBr, which further reacted with small molecules forming brominated derivates. It implied debromination of raw nonmetallic fractions of waste printed circuit boards or pyrolysis products should be applied for its environmentally sound treating.

KW - electronic waste

KW - waste printed circuit borads

KW - brominated flamen retardant

KW - flame retardant plastics

KW - pyrolysis

U2 - 10.1177/0734242X19894621

DO - 10.1177/0734242X19894621

M3 - Article

SP - 1

EP - 8

JO - Waste management and Research

JF - Waste management and Research

SN - 0734-242X

ER -

ID: 40174497