Synergistic effects of Fe-Mn binary oxide for gaseous arsenic removal in flue gas

High-efficient and economic sorbents are highly desired for arsenic (As) emission control in flue gas from coal-fired power plant. A series of Fe-Mn binary oxides were prepared by a facile method, and their behaviors for gaseous arsenic removal in flue gas were investigated. The binary oxide exhibit...

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Published in:Ecotoxicology and environmental safety 2021-01, Vol.207, p.111491, Article 111491
Main Authors: He, Kai-Qiang, Yuan, Chun-Gang, Jiang, Yang-Hong, Duan, Xue-Lei, Li, Yan, Shi, Meng-Dan
Format: Article
Language:English
Subjects:
Adsorption
Air Pollutants - chemistry
Arsenic - chemistry
Arsenicals
Fe-Mn binary oxides
Flue gas
Gaseous arsenic removal
Gases
Oxidation-Reduction
Oxides - chemistry
Photoelectron Spectroscopy
Synergistic effect
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Summary:High-efficient and economic sorbents are highly desired for arsenic (As) emission control in flue gas from coal-fired power plant. A series of Fe-Mn binary oxides were prepared by a facile method, and their behaviors for gaseous arsenic removal in flue gas were investigated. The binary oxide exhibited a remarkable synergistic effect for arsenic removal compared with Mn or Fe monometallic oxide. The possible effects of CO2, NO, SO2, and O2 on the removal performance were also studied. The adsorption ability was excellent and stable in simulated flue gas conditions. X-ray photoelectron spectroscopy (XPS) and high-performance liquid chromatography atomic fluorescence spectroscopy (HPLC−AFS) coupling system were applied to analyze the species of surface-adsorbed arsenicals and soluble arsenicals. It was confirmed that the good sorption performance resulted from oxidation of As2O3 (As(III)) to As2O5 (As(V)) by Mn oxide and followed by efficient adsorption of As(V) on Fe oxide. Considering the toxicity of pentavalent arsenicals is lower than trivalent arsenicals, the oxidation of arsenic compounds can not only enhance its removal capacity but also decrease the toxicity of arsenicals after capture. [Display omitted] ●A binary oxide exhibited excellent adsorption performance for gaseous arsenic.●The good removal ability resulted from the synergic effects between Fe and Mn.●The synthesized sorbents could greatly reduce the toxicity of arsenical in flue gas.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2020.111491