Enhanced degradation and mineralization of estriol over ZrO2/OMS-2 nanocomposite: Kinetics, pathway and mechanism

MnO2 Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

“…Two peaks centered around 642.3 and 654.7 eV were observed in the Mn 2p core spectrum, corresponding to the spin–orbit doublet states of Mn 2p 3/2 and Mn 2p 1/2 (Figure b). After spectral decomposition, two chemical states of Mn, i.e., Mn 3+ and Mn 4+ , could be distinguished, and the ratios of them were 54.1 and 45.9%, which is in accordance with other reported δ-MnO 2 because of K + ions inside of tunnel to support the layered structure. − The coexistence of Mn 3+ and Mn 4+ species is favorable for PMS activation as it involves a charge transfer process. Moreover, the relatively high ratio of Mn 3+ is advantageous as an electron donor for PMS activation. , As to the O 1s spectrum (Figure c), three curves were fitted as lattice oxygen (Mn–O–Mn), adsorbed hydroxy (Mn–O–H), and O V s with the ratios of ∼57.0, 25.8, and 17.2%, respectively.…”

Using waste to treat waste: facile synthesis of hollow carbon nanospheres from lignin for water decontamination

“… 2 In contrast to PMS, PDS shows superior potential in wastewater treatment due to its cost effectiveness, lower activation energy and relative stability in water. 3 Multifarious transition-metal catalysts, such as Fe, 4 Co, 5 Cu, 6 Ni 7 and Mn, 8 have been developed for PDS activation in the generation of SO 4 ˙ − . However, these metal-based catalysts often pollute the water environment, due to metal leaching during activation.…”

Pd single-atom decorated OMS-2 nanorod for efficient silane oxidation

“…It is a cryptomelane-type MnO 2 material with plentiful valence states of manganese (Mn 2+ , Mn 3+ , and Mn 4+ ) coexisting in the open-framework and K ions existing in the internal tunnel to support the structure. [28][29][30] OMS-2 materials feature versatile structures, tailored electronic structure, and high stability, which can be used either directly as catalysts or as ideal supports. 31,32 Various strategies have been employed to further enhance the catalytic property, including surface and morphology modification, doping, and crystal phase control.…”