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Efficient activation of peroxymonosulfate by nanotubular Co3O4 for degradation of Acid Orange 7: performance and mechanism

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Morphology optimization of catalysts has been considered as a viable strategy to improve the catalytic efficiency for peroxymonosulfate (PMS) activation by providing high surface area and abundant active sites. In… Click to show full abstract

Morphology optimization of catalysts has been considered as a viable strategy to improve the catalytic efficiency for peroxymonosulfate (PMS) activation by providing high surface area and abundant active sites. In this study, nanotubular Co3O4 (NT-Co3O4) was successfully synthesized as a PMS activator for the rapid removal of acid orange 7 (AO7) in aqueous solutions. Characterization results showed that NT-Co3O4 presented as aggregated nanotubes, with an average pore diameter of 10 nm. The specific surface area of NT-Co3O4 was as high as 41.8 m2 g−1. Catalytic experiments demonstrated that the degradation rate of AO7 in the NT-Co3O4/PMS system was 15 times greater than that in commercially available Co3O4/PMS system. The effects of various experimental parameters, including catalyst dose, PMS dose, pH, and temperature, were comprehensively investigated. The reactive species in the NT-Co3O4/PMS system were identified as sulfate radical (SO4•−) through both quenching tests and electron paramagnetic resonance (EPR) technology, and ≡CoOH+ played an important role in PMS activation. N atoms in the AO7 molecule were found to be preferentially attacked by SO4•−. Moreover, the good stability and reusability of NT-Co3O4 were confirmed by a five-cycle AO7 removal experiment. This study provides a broader view of the potential applications of nanotubular materials to achieve highly efficient PMS activation in treating dyes in wastewater.

Keywords: activation; peroxymonosulfate; pms; co3o4; nanotubular co3o4; acid orange

Journal Title: Environmental Science and Pollution Research
Year Published: 2022

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