TY - JOUR
T1 - Selective degradation of tetracyclines in the Mn(II)/H2O2/HCO3process with low peroxide dosage
T2 - The neglected role of complexation-mediated electron transfer
AU - Lin, Yimin
AU - Men, Ruike
AU - Dai, Yinhao
AU - Pozdnyakov, Ivan P.
AU - Dong, Hongyu
AU - Guan, Xiaohong
N1 - Publisher Copyright:
© 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
PY - 2026/4/1
Y1 - 2026/4/1
N2 - The Mn(II)/H2O2/HCO3 process shows great potential for the removal of organic contaminants. Nevertheless, the use of excess H2O2 (mM) not only increases the operational cost of this process but also poses risks to subsequent biological treatment processes. In this study, we found that tetracyclines (TCs) could be selectively removed in the Mn(II)/H2O2/HCO3 process under alkaline conditions at low concentrations of H2O2 (sub-mM levels), which can be ascribed to the complex interaction between Mn(II), H2O2, HCO3, and TCs. Mechanistic investigation showed that the active oxidants, including Mn(III), MnO2, HO•, O2•, and CO3•, did not contribute to the selective oxidation of TCs in the Mn(II)/H2O2/HCO3 process. Instead, multiple lines of evidence indicated that the Mn(II)-HCO3-TCs ternary complex could be formed due to the coexistence of Mn(II), HCO3, and TCs and this complex facilitated direct electron transfer from H2O2 to TCs, enabling the selective elimination of TCs in the Mn(II)/H2O2/HCO3 process. Additionally, the addition of typical water matrix components had negligible effects on TCs degradation, underscoring the potential of this process for the practical application. The findings of this study will provide guidance for designing low-peroxide advanced oxidation processes based on the actual scenario and the properties of organic contaminants.
AB - The Mn(II)/H2O2/HCO3 process shows great potential for the removal of organic contaminants. Nevertheless, the use of excess H2O2 (mM) not only increases the operational cost of this process but also poses risks to subsequent biological treatment processes. In this study, we found that tetracyclines (TCs) could be selectively removed in the Mn(II)/H2O2/HCO3 process under alkaline conditions at low concentrations of H2O2 (sub-mM levels), which can be ascribed to the complex interaction between Mn(II), H2O2, HCO3, and TCs. Mechanistic investigation showed that the active oxidants, including Mn(III), MnO2, HO•, O2•, and CO3•, did not contribute to the selective oxidation of TCs in the Mn(II)/H2O2/HCO3 process. Instead, multiple lines of evidence indicated that the Mn(II)-HCO3-TCs ternary complex could be formed due to the coexistence of Mn(II), HCO3, and TCs and this complex facilitated direct electron transfer from H2O2 to TCs, enabling the selective elimination of TCs in the Mn(II)/H2O2/HCO3 process. Additionally, the addition of typical water matrix components had negligible effects on TCs degradation, underscoring the potential of this process for the practical application. The findings of this study will provide guidance for designing low-peroxide advanced oxidation processes based on the actual scenario and the properties of organic contaminants.
KW - Advanced oxidation processes
KW - Electron transfer
KW - Low peroxide dosage
KW - Selective oxidation
KW - Wastewater treatment
UR - https://www.scopus.com/pages/publications/105034978417
U2 - 10.1016/j.jhazmat.2026.141730
DO - 10.1016/j.jhazmat.2026.141730
M3 - 文章
C2 - 41830827
AN - SCOPUS:105034978417
SN - 0304-3894
VL - 507
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 141730
ER -