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- W2953876183 abstract "Abstract Gaseous arsenic capture from flue gas is of great concern due to the high toxicity of arsenic. In this study, a new type of sorbent, magnetic Fe3O4@C@Fe2O3 microparticles with a core-shell structure, was designed by taking advantages of the easy separation property of magnetic sorbents and the excellent adsorption property of Fe2O3 for the capture of arsenic. The Fe3O4@C@Fe2O3 material exhibits a three-layer structure with high specific surface area (27.242 m2 g−1), large pore volume (0.181 cm3 g−1) and excellent magnetic properties (74.1 emu g−1). The synthesized Fe3O4@C@Fe2O3 sorbent demonstrates better arsenic capture performance than Fe3O4, Fe3O4@C or commercial Fe2O3 materials. The capture rate of Fe3O4@C@Fe2O3 for gaseous As2O3 could reach 1.94 mg g−1 min−1 in optimal conditions, and its capacity is 36.22 mg g−1 with a breakthrough threshold of 50%. The performance tests indicate that gaseous As2O3 could be efficiently captured from simulated flue gas and that the presence of SO2 and O2 plays a crucial role in As2O3 capture. The capture mechanism indicates that the conversion of Fe3+/Fe2+ during the oxidation of SO2 by O2 can accelerate the formation of highly active chemisorbed oxygen, and then the adsorbed As2O3 can bond with chemisorbed oxygen to from stable Fe(III)-As(V) compound. After magnetic separation, the spent sorbent can be regenerated through alkali desorption, which facilitates the centralized control of arsenic and the recycling of sorbent. Therefore, the Fe3O4@C@Fe2O3 composite is a promising sorbent for gaseous As2O3 capture from SO2-containing flue gas due to its excellent separation and regeneration properties." @default.
- W2953876183 created "2019-07-12" @default.
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- W2953876183 date "2019-12-01" @default.
- W2953876183 modified "2023-10-10" @default.
- W2953876183 title "Three-layer core-shell magnetic Fe3O4@C@Fe2O3 microparticles as a high-performance sorbent for the capture of gaseous arsenic from SO2-containing flue gas" @default.
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- W2953876183 doi "https://doi.org/10.1016/j.cej.2019.122075" @default.
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