Magnetized algae catalyst by endogenous N to effectively trigger peroxodisulfate activation for ultrafast degraded sulfathiazole: Radical evolution and electron transfer

被引：3
作者：
Diao Y. [1 ,2 ,3 ,4 ]
Shan R. [1 ,3 ,4 ]
Li M. [2 ]
Li S. [1 ,3 ,4 ]
Huhe T. [1 ,3 ,4 ]
Yuan H. [1 ,3 ,4 ]
Chen Y. [1 ,3 ,4 ]
机构：
[1] Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou
[2] School of Municipal & Environmental Engineering, Shandong Jianzhu University, Shandong, Jinan
[3] CAS Key Laboratory of Renewable Energy, Guangzhou
[4] Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou
来源：
Chemosphere | 2023年 / 342卷
关键词：
Electron transfer; Fe-N doped catalyst; Peroxodisulfate; Radical oxidation; Sulfonamide antibiotics;
D O I：
10.1016/j.chemosphere.2023.140205
中图分类号：
学科分类号：
摘要：
An innovative Fe–N co-coupled catalyst MN-2 was prepared from waste spirulina by co-pyrolysis as a highly active carbon-based catalyst for the activation of peroxydisulfate (PDS) for the degradation of sulfathiazole (ST). The protein-rich raw material Spirulina provided sufficient N during the pyrolysis process, thus achieving N doping without an additional nitrogen source, optimizing the interlayer structure of the biochar material and effectively inhibiting the leaching of the ligand metal Fe. MN-2 showed highly efficient catalytic activity for peroxydisulfate (PDS), with a degradation efficiency of 100% for ST within 30 min and a kinetic constant (kobs) reached 0.306 min−1, benefiting from the excellent adsorption ability of MN-2 forming MN-2-PDS* complexes and the electron transfer process generated by Fe3+ and Fe2+ cycling, oxygen-containing functional groups. The effects of PDS dosage, initial pH and coexisting anions on the oxidation process were also investigated. Free radical quenching, electron paramagnetic resonance and electrochemical measurements were employed to explain the hydroxyl (·OH) and sulfate (SO4·−) as the dominant active species and the electron transfer effect on the removal of ST. MN-2 maintained a ST removal rate of 84% after four recycling experiments, showing a high reusability performance. This work provides a simple way to prepare magnetized N-doped biochar, a novel catalyst (MN-2) for efficient activation of PDS for ST degradation, and a feasible method for removing sulfanilamide antibiotics in water environment. © 2023 Elsevier Ltd
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