Journal
MOLECULAR CATALYSIS
Volume 481, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2018.10.018
Keywords
LIBs; Recycling; Co3O4; VOCs; Hydrometallurgy
Categories
Funding
- CONICET [PIP 942]
- CICPBA
- ANPCyT - Argentina [PICT 2012-2366]
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Cobalt oxide was synthesized after a biohydrometallurgical process to recycle lithium-ion batteries (LIBs) from laptops. After separating the components of the spent Lffis, the cathodic material was leached with a bio-generated sulfuric acid at room temperature. Using 5% v/v H2O2 at 2 h, 60% Co was solubilized. After three successive lixiviation steps, 95% cobalt was solubilized. A cobalt oxide (CoOx-R) was obtained by precipitation with H2C2O4 and calcination at 500 degrees C, and was compared to both a cobalt oxide synthesized in the same way but using a commercial cobalt salt (CoOx) and the cathodic material before leaching (LiCo). The characterization by XRD, FTIR, XPS and TPR demonstrated the presence of Co3O4 in CoOx and CoOx-R and LiCoO2 phase in LiCo sample. CoOx and CoOx-R are better catalysts for VOC oxidation than LiCo due to higher S-BET and the presence of the Co3O4. COO has a lower temperature for ethanol total oxidation but CoOx-R produces less acetaldehyde than CoOx. On the other hand, in toluene oxidation CoOx and CoOx-R present a similar performance, with a complete conversion near 300 degrees C. Cobalt oxide obtained using spent LIBs batteries as raw materials could be used as catalysts for VOC removal.
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