Recovery of CuO/C catalyst from spent anode material in battery to activate peroxymonosulfate for refractory organic contaminants degradation

Insights into singlet oxygen generation and electron-transfer process induced by a single-atom Cu catalyst with saturated Cu-N4 sites

“…A modified kinetic model ( k value) considering the reaction rate constant, catalyst dosage, and pollutant concentration was used to compare the degradation rate of organic pollutants in various heterogeneous Fenton-like processes ( Table S2 ). The k value of SA-Cu-NC+PMS (1.77 μmol s −1 g −1 ) is remarkably higher than those of the other previously reported Cu-related heterogeneous Fenton-like catalysts ( k value = 0.02–1.11 μmol s −1 g −1 ) ( Chen et al., 2020 ; Gao et al., 2021a ; Jiang et al., 2018 ; Li et al., 2019 ; Song et al., 2021a , 2021b ; Zhao et al., 2021 ). Consistent with the trend of BPA removal, the TOC removal efficiency reaches 80% in the SA-Cu-NC system within 60 min ( Figure S7 E), which is clearly better than those of the other reference systems ( Cao et al., 2020 ; Pan et al., 2021 ).…”

EPR Evidence for Mechanistic Diversity of Cu(II)/Peroxygen Oxidation Systems by Tracing the Origin of DMPO Spin Adducts

“…Cu-Catalyzed PMS System. In previous reports on homogeneous Cu(II)/PMS systems, 36,37 Chi et al 38 did not observe any EPR signals at pH 4.0 in Cu(II)/PMS system, while Huang et al 39 detected signals of both DMPO-OH and DMPO-SO 4 at pH 8.0. In the present study, diverse DMPO adduct signals were observed as shown in Figure 3a, depending on the solution pH and reaction time in the homogeneous Cu(II)/PMS system.…”

Regeneration of anode materials from complex graphite residue in spent lithium-ion battery recycling process

“…Graphite ore requires purification through complex processes, such as acid washing and anaerobic high-temperature graphitization, which leads to high energy consumption and costs for production. 5 By 2022, the value of graphite for electrodes will reach $29.05 billion. 6 With the increasing depletion of graphite resources, it has become an important strategic resource for the world.…”