Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 406, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124743
Keywords
Spent lithium-ion batteries; Advanced oxidation; alpha-MnO2; beta-MnO2; VOCs oxidation
Categories
Funding
- National Natural Science Foundation of China [21876107, 21607103]
- Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery
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In this study, manganese is selectively recovered from spent lithium-ion batteries via advanced oxidation using potassium permanganate and ozone, and transition metal-doped MnO2 is prepared for catalytic oxidation of VOCs. The introduction of cobalt or nickel into MnO2 significantly improves its catalytic activity and provides a route for the resource utilization of spent LIBs and the synthesis of MnO2.
In this work, manganese is selectively and efficiently recovered from spent lithium-ion batteries via advanced oxidation by using potassium permanganate and ozone, and the transition metal-doped alpha-MnO2 and beta-MnO2 are one-step prepared for catalytic oxidation of VOCs. The recovery rate of manganese can be approximately 100% while the recovery efficiency of cobalt, nickel, and lithium is less than 15%, 2%, and 1%, respectively. Compared with pure alpha-MnO2 and beta-MnO2, transition metal-doped alpha-MnO2 and beta-MnO2 exhibit better catalytic performance in toluene and formaldehyde removal attributed to their lower crystallinity, more defects, larger specific surface area, more oxygen vacancies, and better low-temperature redox ability. Besides, the introduction of the appropriate proportion of cobalt or nickel into MnO2 can significantly improve its catalytic activity. Furthermore, the TD/GC-MS result indicates that toluene may be oxidized in the sequence of toluene - benzyl alcohol - benzaldehyde-benzoic acid - acetic acid, 2-cyclohexen-1-one, 4-hydroxy-, cyclopent-4-ene-1,3-dione carbon dioxide. This method provides a route for the resource utilization of spent LIBs and the synthesis of MnO2.
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