Barrios Bermúdez, NiurkaCerpa Naranjo, ArisbelRojas Cervantes, María Luisa2024-12-022024-12-022024-07-27N. Barrios-Bermúdez, A. Cerpa-Naranjo, M. L. Rojas-Cervantes. “Efficient Methylene Blue Degradation by Activation of Peroxymonosulfate over Co(II) and/or Fe(II) Impregnated Montmorillonites”. Catalysts (2024) 14 2024 (1-22). DOI: 10.21950/GOFMXV2073-4344https://doi.org/10.3390/catal14080479https://hdl.handle.net/20.500.14468/24623The registered version of this article, first published in “Catalysts, 14(8), 479", is available online at the publisher's: MDPI, https://doi.org/10.3390/catal14080479La versión registrada de este artículo, publicado por primera vez en “Catalysts, 14(8), 479", está disponible en línea en el sitio web del editor: MDPI, https://doi.org/10.3390/catal14080479Two commercial montmorillonites, namely montmorillonite K10 (MK10) and montmorillonite pillared with aluminum (MPil) were impregnated with cobalt(II) and/or iron(II) acetates by incipient wetness impregnation and used to activate peroxymonosulfate (PMS) for the degradation of methylene blue (MB) dye in water. Various characterization techniques, including ICP-MS, XRD, SEM and TEM with EDX, and N2 physisorption, confirmed the successful impregnation process. The removal of the dye resulted from a combined effect of adsorption and PMS activation through Co3+/Co2+ redox couples. The MK10 series exhibited a higher degree of dye adsorption compared to the MPil series, leading to enhanced dye decomposition and superior catalytic performance in the former. The influence of catalyst mass, dye concentration, and initial pH was investigated. SO4•− radicals were found as the dominant reactive oxygen species. Co2+-impregnated montmorillonites showed better performance than their Fe2+-impregnated counterparts, with MK10-Co achieving complete MB removal in just 20 min. High degradation values of MB were achieved using lower PMS/MB ratios and amount of catalyst than others reported in the literature, showing the efficiency of cobalt-impregnated montmorillonites. Moreover, the catalysts maintained excellent catalytic activity after three reaction cycles.eninfo:eu-repo/semantics/openAccess23 Química::2303 Química inorgánicaartículomontmorillonitesmethylene blueperoxymonosulfateheterogeneous catalysts