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<p>This work demonstrates the use of recycled LiMn₂O₄-based cathode powder (SLBCP) from spent Li-ion batteries as a catalyst for the selective reductive cleavage of the azo dye Sunset Yellow (SY) under mild acidic conditions. The catalyst promotes cleavage of the –N = N– bond, yielding sulfanilic acid (SA) and 1-amino-2-naphthol-6-sulfonic acid (ANSA) as stable products, while COD analyses confirm that the overall organic load remains essentially unchanged. Kinetic analysis indicates an apparent first-order profile consistent with a Langmuir–Hinshelwood mechanism, and electrochemical studies reveal progressive passivation of Mn⁴⁺ sites that correlates with partial catalyst deactivation. These findings highlight a sustainable pathway that couples e-waste valorisation with dye upcycling, illustrating how spent battery materials can be repurposed to enable selective reduction processes in aqueous systems.</p> Graphical Abstract <p></p>

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From waste to value: recycled Li-ion battery cathode catalyzes the transformation of sunset yellow into functional aromatics

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Letícia T. Lima,
  • Eric M. Garcia,
  • Hosane A. Taroco,
  • Julio O. F. Melo,
  • Cristiane G. Taroco

摘要

This work demonstrates the use of recycled LiMn₂O₄-based cathode powder (SLBCP) from spent Li-ion batteries as a catalyst for the selective reductive cleavage of the azo dye Sunset Yellow (SY) under mild acidic conditions. The catalyst promotes cleavage of the –N = N– bond, yielding sulfanilic acid (SA) and 1-amino-2-naphthol-6-sulfonic acid (ANSA) as stable products, while COD analyses confirm that the overall organic load remains essentially unchanged. Kinetic analysis indicates an apparent first-order profile consistent with a Langmuir–Hinshelwood mechanism, and electrochemical studies reveal progressive passivation of Mn⁴⁺ sites that correlates with partial catalyst deactivation. These findings highlight a sustainable pathway that couples e-waste valorisation with dye upcycling, illustrating how spent battery materials can be repurposed to enable selective reduction processes in aqueous systems.

Graphical Abstract