TY - JOUR
T1 - Nitrogen doped bimetallic sludge biochar composite for synergistic persulfate activation
T2 - Reactivity, stability and mechanisms
AU - Li, Zheng
AU - Chen, Haifeng
AU - Dong, Chunying
AU - Jin, Chuzhan
AU - Cai, Meiqiang
AU - Chen, Yan
AU - Xie, Zhiqun
AU - Xiong, Xingaoyuan
AU - Jin, Micong
N1 - Publisher Copyright:
© 2023 Elsevier Inc.
PY - 2023/7
Y1 - 2023/7
N2 - As a recycling use of waste activated sludge (WAS), we used high-temperature pyrolysis of WAS to support bimetallic Fe–Mn with nitrogen (N) co-doping (FeMn@N–S), a customized composite catalyst that activates peroxysulphate (PS) for the breakdown of tetracycline (TC). First, the performance of TC degradation was evaluated and optimized under different N doping, pH, catalyst dosages, PS dosages, and contaminant concentrations. Activating PS with FeMn@N–S caused the degradation of 91% of the TC in 120 min. Next, characterization of FeMn@N–S by XRD, XPS and FT-IR analysis highlights N doping is beneficial to take shape more active sites and reduces the loss of Fe and Mn during the degradation reaction. As expected, the presence of Fe–Mn bimetallic on the catalyst surface increases the rate of electron transfer, promoting the redox cycle of the catalyst. Other functional groups on the catalyst surface, such as oxygen-containing groups, accelerated the electron transfer during PS activation. Free radical quenching and ESR analysis suggest that the main contributor to TC degradation is surface-bound SO4•−, along with the presence of single linear oxygen (1O2) oxidation pathway. Finally, the FeMn@N–S composite catalyst exhibits excellent pH suitability and reusability, indicating a solid practicality of this catalyst in PS-based removal of antibiotics from wastewater.
AB - As a recycling use of waste activated sludge (WAS), we used high-temperature pyrolysis of WAS to support bimetallic Fe–Mn with nitrogen (N) co-doping (FeMn@N–S), a customized composite catalyst that activates peroxysulphate (PS) for the breakdown of tetracycline (TC). First, the performance of TC degradation was evaluated and optimized under different N doping, pH, catalyst dosages, PS dosages, and contaminant concentrations. Activating PS with FeMn@N–S caused the degradation of 91% of the TC in 120 min. Next, characterization of FeMn@N–S by XRD, XPS and FT-IR analysis highlights N doping is beneficial to take shape more active sites and reduces the loss of Fe and Mn during the degradation reaction. As expected, the presence of Fe–Mn bimetallic on the catalyst surface increases the rate of electron transfer, promoting the redox cycle of the catalyst. Other functional groups on the catalyst surface, such as oxygen-containing groups, accelerated the electron transfer during PS activation. Free radical quenching and ESR analysis suggest that the main contributor to TC degradation is surface-bound SO4•−, along with the presence of single linear oxygen (1O2) oxidation pathway. Finally, the FeMn@N–S composite catalyst exhibits excellent pH suitability and reusability, indicating a solid practicality of this catalyst in PS-based removal of antibiotics from wastewater.
KW - Fe–Mn bimetallic
KW - N doping
KW - Persulfate
KW - Sludge-based catalyst
KW - Tetracycline
UR - http://www.scopus.com/inward/record.url?scp=85154032061&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2023.115998
DO - 10.1016/j.envres.2023.115998
M3 - Journal article
C2 - 37127103
AN - SCOPUS:85154032061
SN - 0013-9351
VL - 229
JO - Environmental Research
JF - Environmental Research
M1 - 115998
ER -