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<p>This study demonstrates the effective use of recycled Li-ion battery cathode tapes—specifically LiCoO<sub>2</sub> and LiMn<sub>0.3</sub>Co<sub>0.7</sub>O<sub>2</sub>—for the degradation of methylene blue through a photo-Fenton-like process. The LiMn<sub>0.3</sub>Co<sub>0.7</sub>O<sub>2</sub> cathode exhibited superior catalytic performance, with a higher first-order rate constant (14.0 × 10⁻³ min⁻¹ vs. 9.4 × 10⁻³ min⁻¹) and a smaller band gap (2.06&#xa0;eV vs. 2.25&#xa0;eV), enabling more efficient hydroxyl radical generation. ESI-MS analysis identified degradation intermediates (<i>m/z</i> = 227 and 114), confirming progressive mineralization pathways. These findings highlight the dual environmental benefits of using recycled cathodes: mitigating dye pollution and promoting sustainable battery waste management. The results pave the way for scalable applications of waste-derived materials in advanced oxidation processes.</p>

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Photo-Fenton-like degradation of methylene blue using recycled LiCoO2 and LiMn0.3Co0.7O2 cathodes: a comparative study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月21日

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  • Eric M. Garcia,
  • Hosane A. Tarôco,
  • Júlio O. F. Melo

摘要

This study demonstrates the effective use of recycled Li-ion battery cathode tapes—specifically LiCoO2 and LiMn0.3Co0.7O2—for the degradation of methylene blue through a photo-Fenton-like process. The LiMn0.3Co0.7O2 cathode exhibited superior catalytic performance, with a higher first-order rate constant (14.0 × 10⁻³ min⁻¹ vs. 9.4 × 10⁻³ min⁻¹) and a smaller band gap (2.06 eV vs. 2.25 eV), enabling more efficient hydroxyl radical generation. ESI-MS analysis identified degradation intermediates (m/z = 227 and 114), confirming progressive mineralization pathways. These findings highlight the dual environmental benefits of using recycled cathodes: mitigating dye pollution and promoting sustainable battery waste management. The results pave the way for scalable applications of waste-derived materials in advanced oxidation processes.