TY - JOUR
T1 - Improving bromine fixation in co-pyrolysis of non-metallic fractions of waste printed circuit boards with Bayer red mud
AU - Chen, Ye
AU - Zhang, Yi
AU - Yang, Jiakuan
AU - Liang, Sha
AU - Liu, Kang
AU - Xiao, Keke
AU - Deng, Huali
AU - Hu, Jingping
AU - Xiao, Bo
N1 - Publisher Copyright:
© 2018
PY - 2018/10/15
Y1 - 2018/10/15
N2 - A method to improve bromine fixation by co-pyrolysis of non-metallic fractions (NMFs) of waste printed circuit boards (WPCBs) with Bayer red mud (RM) has been developed. More than 78.59 wt% of bromine was fixed into the solid residues with an addition of 15 wt% RM after co-pyrolysis at 500 °C, comparing with 36.42 wt% without the RM addition. Metal oxides (Fe2O3, Al2O3, TiO2, and Na2O, etc.) in the RM contributed significantly to the bromine fixation. The bromine fixation percentages were 62.94, 65.05, 47.24, and 49.05 wt% with an individual addition of 15 wt% Fe2O3, Na2O, Al2O3, and TiO2, respectively. Metal oxides in the RM showed synergistic effects on the bromine fixation, and this can be attributed to the secondary reaction of Na2O and bromine decomposed from FeBr3. The mechanisms of bromine fixation by RM are formation of Br-M (M: Fe, Al, Ti, and Na) and O–H bonds generated from the direct elimination and a two-step of dissociative adsorption and β-H elimination reactions between metal oxides and bromide.
AB - A method to improve bromine fixation by co-pyrolysis of non-metallic fractions (NMFs) of waste printed circuit boards (WPCBs) with Bayer red mud (RM) has been developed. More than 78.59 wt% of bromine was fixed into the solid residues with an addition of 15 wt% RM after co-pyrolysis at 500 °C, comparing with 36.42 wt% without the RM addition. Metal oxides (Fe2O3, Al2O3, TiO2, and Na2O, etc.) in the RM contributed significantly to the bromine fixation. The bromine fixation percentages were 62.94, 65.05, 47.24, and 49.05 wt% with an individual addition of 15 wt% Fe2O3, Na2O, Al2O3, and TiO2, respectively. Metal oxides in the RM showed synergistic effects on the bromine fixation, and this can be attributed to the secondary reaction of Na2O and bromine decomposed from FeBr3. The mechanisms of bromine fixation by RM are formation of Br-M (M: Fe, Al, Ti, and Na) and O–H bonds generated from the direct elimination and a two-step of dissociative adsorption and β-H elimination reactions between metal oxides and bromide.
KW - Bromine fixation
KW - Co-pyrolysis
KW - Metal oxide
KW - Non-metallic fractions
KW - Red mud
KW - Waste printed circuit boards
UR - http://www.scopus.com/inward/record.url?scp=85047508851&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.05.269
DO - 10.1016/j.scitotenv.2018.05.269
M3 - 文章
C2 - 29929318
AN - SCOPUS:85047508851
SN - 0048-9697
VL - 639
SP - 1553
EP - 1559
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -