Synthesis, characterization and photocatalytic properties of nanostructured CoFe2O4 recycled from spent Li-ion batteries

Chemosphere
M N MouraM B J G Freitas

Abstract

In this study, cobalt (Co) was recycled from spent lithium ion batteries (LIBs) and used to synthesize cobalt ferrite (CoFe2O4-LIBs), which was applied as a catalyst for heterogeneous photo Fenton reactions that discolored methylene blue (MB) dye. The co-precipitation method was used to synthesize CoFe2O4-LIBs and CoFe2O4-R nanoparticles with spinel structures using as raw materials of the LIB cathodes and commercial reagents. X-ray diffraction (XRD) identified the formation of spinel-type CoFe2O4, which formed clusters that could be seen under scanning electron microscopy (SEM) analysis and nanometric particles seen under transmission electron microscopy (TEM). Inductively Coupled Plasma Optical Emission Spectrometer (ICP OES) analysis was used to determine the concentrations of metals present in the ferrite, which reached 6.5% (w/w) of Co. The optimal conditions for discoloring the dye were evaluated using a factorial design. Using CoFe2O4 as a catalyst, the best conditions for catalytic reaction were pH 3, 30.0 mg of catalyst, and 8.0 mL of H2O2 73% (v/v). Discoloration efficiencies of 87.3% and 87.7% were obtained from CoFe2O4-R and CoFe2O4-LIBs, respectively. Therefore, CoFe2O4-LIBs proved to be an efficient catalyst for d...Continue Reading

References

Aug 30, 2011·Nature Nanotechnology·Uwe Holzwarth, Neil Gibson
Jun 19, 2012·Journal of Environmental Management·José Roberto GuimarãesRenata Nogueira de Araújo
May 28, 2013·Journal of Hazardous Materials·Yao-Jen TuChien-Kuei Chang

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Citations

Aug 21, 2018·Chemical Society Reviews·Xiaoxiao ZhangRenjie Chen
Nov 7, 2019·Nature·Gavin HarperPaul Anderson
Jul 19, 2021·Advances in Colloid and Interface Science·Hong QinChanglin Wang

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