Fluorine-containing wastewater seriously threatens human health due to the wide application of sodium p -perfluorous nonenoxybenzenesulfonate (OBS). Herein, a novel Fe-Co bimetallic biochar (Fe-Co@BC) with abundant pore structure, functional groups and quickly electron transfer capability was prepared using hydrothermal method. Meanwhile, Fe-Co@BC-Ⅰ exhibited a superior catalytic capacity for degradation of OBS in PMS system, and the removal efficiency of OBS reached to 94.1 % within 60 min. After three cycles, the removal efficiency of OBS still up to 80 % and the Fe-Co had almost no leaching (Fe: 0.006 mg/L; Co: 0.023 mg/L). Further mechanistic insights were verified that high catalytic capacity and stability ascribed to the synergistic effects of Fe and Co, where Fe-Co mutual interaction promoted the formation of Fe 2+ and Co 2+ and accelerated electron transfer of catalyst. In addition, the quenching experiments and electron paramagnetic resonance (EPR) proved that the degradation of OBS can be mainly ascribed to indirect oxidation of SO 4 −• , O 2 −• and •OH, and the possible degradation pathway of OBS was proposed in the Fe-Co@BC/PMS system. This study provides an insight into bimetallic prepared and activation PMS degradation fluorinated wastewater.
ABSTRACT Extracting uranium (U(VI)) from fluoride-rich radioactive wastewater is of great significance for the development of nuclear energy and environmental remediation. The presence of thermodynamically stable [UO 2 F n ] 2−n (n= 0, 1, 2, 3, 4) aqueous complexes in fluoride-rich U(VI)-containing wastewater significantly hinders the efficiency of uranyl extraction and recovery using conventional methods. In this study, we report a direct precipitation method using deferiprone ligands for efficient uranyl extraction from fluoride-rich wastewater that offsets the preparation of solid materials. The deferiprone ligands exhibited exceptional chelating ability competing toward F − . In simulated 2.1 × 10 -4 mol/L U(VI) wastewater with F − concentrations ranging from 1 to 10 g/L, adjusting the amount of deferiprone ligands enabled a high U(Ⅵ) precipitation rate of 97.60% to 86.90%, correspondingly. A remarkable 99.71% recovery of U(Ⅵ) from real fluoride-rich alkaline wastewater was achieved within 2 hours. Detailed investigations revealed that the competitive chelating by deferiprone ligands results in the formation of insoluble U(VI)-deferiprone complexes ([(UO 2 )(H 2 O)(C 7 NO 2 H 8 ) 2 ]·4H 2 O), driven by π-π stacking interactions, electrostatic attractions, and intermolecular hydrogen bonds. Given the cost-efficiency and excellent radiation resistance of deferiprone ligands, this efficient and straightforward precipitation approach holds great promise for practical applications in U(VI) remediation and resource recovery from fluoride-rich wastewater.
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