TY - JOUR
T1 - Enhanced removals of micropollutants in binary organic systems by biomass derived porous carbon/peroxymonosulfate
AU - Tian, Wenjie
AU - Lin, Jingkai
AU - Zhang, Huayang
AU - Duan, Xiaoguang
AU - Sun, Hongqi
AU - Wang, Hao
AU - Wang, Shaobin
N1 - Funding Information:
The authors thank Dr Anton Tadich for conducting the X-ray absorption measurements at the Australian Synchrotron. The authors also acknowledge the funding from the Australian Research Council ( DP190103548 ) and the support from Advanced Queensland Partnership Project ( AQIP03716 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/4/15
Y1 - 2021/4/15
N2 - Water pollution usually involves multiple pollutants, and their degradation mechanisms are complicated. In this study, we investigated the degradation of single and binary pollutants (phenol and p-hydroxybenzoic acid (HBA)) in water, using biomass-derived N-doped porous carbon (Y-PC) for peroxymonosulfate (PMS) activation and we found better kinetics and efficiencies of degradation in binary pollutants than single pollutant systems. Electron paramagnetic resonance (EPR), quenching experiments, and electrochemical tests indicated that •OH, SO4•−, O2•−, and 1O2 accounted for the catalytic oxidation of phenol/HBA, while the electron-transfer pathway had an additional contribution to phenol degradation. We unveiled that the HBA degradation rate was similar in the binary and single systems due to the non-selective attack of the micropollutants by •OH, SO4•−, O2•− and 1O2. However, phenol degradation rate was significantly accelerated in the binary phenol/HBA system as compared to that in the single phenol solution, due to the exclusive and selective role of electron transfer pathway. In the binary micropollutant system, a fortified electron-transfer pathway over phenol directly expedited its decomposition and contributed indirectly to this process. This study provides new insights into porous carbon-based advanced oxidation processes for the simultaneous removal of multicomponent contaminants in practical applications.
AB - Water pollution usually involves multiple pollutants, and their degradation mechanisms are complicated. In this study, we investigated the degradation of single and binary pollutants (phenol and p-hydroxybenzoic acid (HBA)) in water, using biomass-derived N-doped porous carbon (Y-PC) for peroxymonosulfate (PMS) activation and we found better kinetics and efficiencies of degradation in binary pollutants than single pollutant systems. Electron paramagnetic resonance (EPR), quenching experiments, and electrochemical tests indicated that •OH, SO4•−, O2•−, and 1O2 accounted for the catalytic oxidation of phenol/HBA, while the electron-transfer pathway had an additional contribution to phenol degradation. We unveiled that the HBA degradation rate was similar in the binary and single systems due to the non-selective attack of the micropollutants by •OH, SO4•−, O2•− and 1O2. However, phenol degradation rate was significantly accelerated in the binary phenol/HBA system as compared to that in the single phenol solution, due to the exclusive and selective role of electron transfer pathway. In the binary micropollutant system, a fortified electron-transfer pathway over phenol directly expedited its decomposition and contributed indirectly to this process. This study provides new insights into porous carbon-based advanced oxidation processes for the simultaneous removal of multicomponent contaminants in practical applications.
KW - Binary Micropollutants
KW - Biomass-derived N-doped carbon
KW - Nonradical
KW - Peroxymonosulfate
KW - Radical
UR - http://www.scopus.com/inward/record.url?scp=85095839345&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.124459
DO - 10.1016/j.jhazmat.2020.124459
M3 - Article
C2 - 33172679
AN - SCOPUS:85095839345
SN - 0304-3894
VL - 408
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 124459
ER -