Abstract
A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for simultaneous abatement of NO and Hg0. 15%LaMn/BAC manifested excellent removal efficiency of Hg0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg0 removal and NO removal was explored; thereinto, Hg0 removal had no influence on NO removal, while NO removal preponderated over Hg0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg0 removal. The physicochemical characterization of related samples was characterized by SEM, XRD, BET, H2-TPR, NH3-TPD, and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species, and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. The results indicated that 15%LaMn/BAC was a promising catalyst for simultaneous abatement of Hg0 and NO at low temperature.
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This study was financially supported by the Natural Science Foundation of Hunan Province (2020JJ5487), the Scientific Research Project of Hunan Provincial Department of Education (19C1611, 17A180), and the National Key Research and Development Program of China (2016YFC0204100).
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Conceptualization: Lei Gao; methodology: Lei Gao and Caiting Li; formal analysis and investigation: Lei Yi and Jinke Xie; writing—original draft preparation: Jian Shan and Yingyun Liu; writing—review and editing: Junwen Lv and Mi Li; funding acquisition, resources, and supervision: Lei Gao.
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Highlights
• Superior resistance to SO2 and H2O exhibited by 15%LaMn/BAC for NO and Hg0 simultaneous removal.
• The introduction of La species into Mn/BAC could tremendously modify its physicochemical properties.
• The positive synergistic effect between MnOx and LaOx was achieved.
• The mutual effects of NO removal and Hg0 removal were investigated.
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Yi, ., Xie, J., Li, C. et al. LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0. Environ Sci Pollut Res 29, 2258–2275 (2022). https://doi.org/10.1007/s11356-021-15752-y
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DOI: https://doi.org/10.1007/s11356-021-15752-y