Degradation of methylene blue via H2O2/HCO3-/Co2+ system using cobalt recovered from spent Li-ion batteries

被引：0

作者：

Garcia, Eric M. ^{[1
]}

Taroco, Hosane A. ^{[1
]}

Melo, Julio O. F. ^{[1
]}

Rocha, Patricia A. ^{[1
]}

Balestra, Roseli M. ^{[2
]}

Taroco, Cristiane G. ^{[3
]}

Gorgulho, Honoria F. ^{[4
]}

机构：

[1] Fed Univ Sao Joao Del Rei UFSJ, DECEB Dept Exacts & Biol Sci, BR-35701970 Sete Lagoas, MG, Brazil

[2] Fed Univ Sao Joao Del Rei UFSJ, DEMEP Dept Mech & Prod Engn, Sao Joao Del Rei, MG, Brazil

[3] Fed Univ Sao Joao Del Rei UFSJ, DEPEL Dept Elect Engn, Sao Joao Del Rei, MG, Brazil

[4] Fed Univ Sao Joao Del Rei UFSJ, DCNAT Dept Nat Sci DEPEL, Sao Joao Del Rei, MG, Brazil

来源：

IONICS | 2025年 / 31卷 / 08期

关键词：

Li-ion battery; Recycling; Spent cathode; Methylene blue; CATHODES; CARBONATE;

D O I：

10.1007/s11581-025-06471-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The increasing environmental burden posed by synthetic dyes and electronic waste demands innovative, sustainable solutions. In this work, we present a green and efficient advanced oxidation process (AOP) employing cobalt ions recovered from spent Li-ion battery (LIB) cathodes to catalyze the degradation of methylene blue (MB), a model organic pollutant. The Co2+/HCO3-/H2O2 system enabled complete decolorization of a 10 ppm MB solution within 10 min under mild conditions (pH similar to 8.35), with kinetic analysis revealing pseudo-zero-order behavior in MB and half-order dependence on Co2+, HCO3-, and H2O2. UV-Vis spectroscopy confirmed the formation of the [Co(CO3)(3)](3-) complex, while electrospray ionization mass spectrometry (ESI-MS) revealed demethylated intermediates and smaller fragments, suggesting progressive mineralization. Mechanistic insights indicate the predominant formation of carbonate radicals (center dot CO3-), as supported by isopropanol scavenging experiments. This study highlights the dual environmental benefit of cobalt recovery and wastewater treatment, offering a sustainable pathway for the valorization of electronic waste and the mitigation of textile dye pollution.

引用

页码：7837 / 7847

页数：11