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• W2965723360 endingPage "115877" @default.
• W2965723360 startingPage "115877" @default.
• W2965723360 abstract "The discharging of Rhodamine B (RhB) from wastewater has caused huge environment pollution. Peroxymonosulfate (PMS) oxidation is an effective way to remove it from wastewater. However, finding an environmentally friendly metal to activate PMS is a key step for the oxidation process. In this study, nanorod α-MnO2 loaded palygorskite (α-MnO2/Pal) was fabricated by a simple hydrothermal method. The analysis of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) confirmed the loading of α-MnO2 on the surface of Pal and characterized the surface of the composite. The surface area of α-MnO2/Pal composite was 159.13 m2/g, which was much higher than that of Pal and α-MnO2. The Pal, α-MnO2, Mn2+, and α-MnO2/Pal were used to activate PMS for RhB degradation. Nearly 100% RhB degradation was obtained in α-MnO2/Pal + PMS system in 180 min and in α-MnO2 + PMS system in 300 min, while only 50% degradation was obtained in Pal + PMS system and 71.4% degradation in Mn2+ + PMS system in 300 min. The degradation fitted the pseudo-first-order reaction kinetics well with rate constant of 0.02041 min−1 for α-MnO2/Pal + PMS system, 0.01192 min−1 for α-MnO2 + PMS system, and 0.00435 min−1 for Mn2+ + PMS system, respectively. The factors affecting RhB degradation were further investigated. The RhB degradation efficiency increased with the increase of α-MnO2/Pal dosages, PMS dosages and temperatures. The degradation was inhibited at pH > 5.5, while was favorable at pH < 5.5. The major reactive radicals responsible for RhB degradation classified by radical quenching experiment were O2− and 1O2. The possible mechanism was further proposed based on the results. The α-MnO2/Pal composite showed nearly 50% mineralization ratio in the presence of PMS and an excellent reusability. The results from this study revealed that α-MnO2/Pal composite is an effective catalyst to activate PMS for RhB degradation." @default.
• W2965723360 created "2019-08-13" @default.
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• W2965723360 date "2020-01-01" @default.
• W2965723360 modified "2023-10-14" @default.
• W2965723360 title "α-MnO2/Palygorskite composite as an effective catalyst for heterogeneous activation of peroxymonosulfate (PMS) for the degradation of Rhodamine B" @default.
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• W2965723360 doi "https://doi.org/10.1016/j.seppur.2019.115877" @default.
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