CuCo₂O₄ supported on activated carbon as a novel heterogeneous catalyst with enhanced peroxymonosulfate activity for...

CuCo₂O₄ was synthesized via a relatively simple method, and innovatively supported onto the activated carbon (AC) by calcination to obtain a novel heterogeneous catalyst (AC-CuCo₂O₄). Brilliant red 3BF (3BF) was selected as the probe compound to investigate the catalytic activity of AC-CuCo₂O₄ in the presence of peroxymonosulfate (PMS). The results showed that 98% removal rate could be achieved and the reaction rate constant (0.476 min^-1) was 5.2 times greater than that of CuCo₂O₄ alone (0.091min^-1), suggesting that the introduction of AC could greatly enhance the catalytic activity of pure CuCo₂O₄. Typically, the 3BF removal was as high as 96% after five cycles, showing the good stability of catalyst reuse. Additionally, the effects of the initial pH, catalyst dosage, PMS concentration and reaction temperature on the 3BF removal were investigated, demonstrating that AC-CuCo₂O₄ effectively remove 3BF over a wide pH range (5.0-10.0) and possessed temperature-tolerant performance. To further explore the 3BF removal mechanism, electron paramagnetic resonance technology combining with trapping agents was employed to confirm the involvement of reactive oxygen species including SO₄^•-, ^•OH, O₂^•- and ¹O₂, which distinctly differed from the reported CuCo₂O₄ for PMS activation. These findings provided an addition promising strategy in environmental remediation.