TY - JOUR
T1 - Z-scheme Fe@Fe2O3/BiOBr heterojunction with efficient carrier separation for enhanced heterogeneous photo-Fenton activity of tetracycline degradation
T2 - Fe2+ regeneration, mechanism insight and toxicity evaluation
AU - Wang, Xiangyu
AU - Lin, Xian
AU - Wu, Xi
AU - Lynch, Iseult
N1 - Copyright © 2024. Published by Elsevier Inc.
PY - 2024/2/6
Y1 - 2024/2/6
N2 - The recombination of photogenerated carrier leads to inefficient Fe
2+ regeneration, which limits the extensive application of heterogeneous photo-Fenton. Here, a novel Fe@Fe
2O
3/BiOBr catalyst with Z-scheme heterojunction structure is designed, and the establishment of the Z-scheme heterojunction facilitates the separation and transfer of photogenerated carrier and maintains the superior redox capability of the system. As-prepared Fe@Fe
2O
3/BiOBr catalyst exhibits outstanding catalytic performance and stability, especially for the optimum composite FFB-3, its degradation efficiency of tetracycline (TC) achieves 98.22% and the mineralization degree reaches 59.48% within 90 min under natural pH. The preeminent catalytic efficiency benefited from the synergistic of heterogeneous photo-Fenton and Z-scheme carriers transfer mechanism, where Fe
2+ regeneration was achieved by photogenerated electrons, and increased hydroxyl radicals were produced with the participation of H
2O
2 in-situ generated. The results of free-radical scavenging experiment and ESR illustrated that •OH, •O
2
-,
1O
2 and h
+ were active species participating in TC degradation. Furthermore, the TC degradation paths were proposed according to LC-MS, and the toxicity evaluation result showed that the toxicity of TC solutions was markedly decreased after degradation. This study provides an innovative strategy for heterogeneous photo-Fenton degradation of antibiotic contaminations by constructing Z-scheme heterojunctions.
AB - The recombination of photogenerated carrier leads to inefficient Fe
2+ regeneration, which limits the extensive application of heterogeneous photo-Fenton. Here, a novel Fe@Fe
2O
3/BiOBr catalyst with Z-scheme heterojunction structure is designed, and the establishment of the Z-scheme heterojunction facilitates the separation and transfer of photogenerated carrier and maintains the superior redox capability of the system. As-prepared Fe@Fe
2O
3/BiOBr catalyst exhibits outstanding catalytic performance and stability, especially for the optimum composite FFB-3, its degradation efficiency of tetracycline (TC) achieves 98.22% and the mineralization degree reaches 59.48% within 90 min under natural pH. The preeminent catalytic efficiency benefited from the synergistic of heterogeneous photo-Fenton and Z-scheme carriers transfer mechanism, where Fe
2+ regeneration was achieved by photogenerated electrons, and increased hydroxyl radicals were produced with the participation of H
2O
2 in-situ generated. The results of free-radical scavenging experiment and ESR illustrated that •OH, •O
2
-,
1O
2 and h
+ were active species participating in TC degradation. Furthermore, the TC degradation paths were proposed according to LC-MS, and the toxicity evaluation result showed that the toxicity of TC solutions was markedly decreased after degradation. This study provides an innovative strategy for heterogeneous photo-Fenton degradation of antibiotic contaminations by constructing Z-scheme heterojunctions.
U2 - 10.1016/j.envres.2024.118396
DO - 10.1016/j.envres.2024.118396
M3 - Article
C2 - 38331143
SN - 0013-9351
JO - Environmental Research
JF - Environmental Research
M1 - 118396
ER -