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Article Abstract
With the rapid development of adsorbents for removal of elemental mercury (Hg) from coal combustion flue gas, the preparation of adsorbents with superior performance, lower cost and environmental friendliness remains an important challenge. An incipient wetness impregnation method followed by in-situ selenization was used to load copper selenide (CuSe) onto the surface of optimal magnetic biochar (OMBC). The results showed that CuSe significantly enhanced the Hg removal performance of the OMBC, and CuSe loading ratio of 10 % (10CuSe/OMBC) had the best Hg removal performance. 10CuSe/OMBC maintained its Hg removal efficiency above 95 % for 150 min at 30-150 °C, and it had a good resistance to SO. The equilibrium adsorption capacity of 10CuSe/OMBC could reach up to 8.73 mg/g, which was close to the theoretical value 12.99 mg/g, and the adsorption rate was up to 20.33 µg/(g·min) Meanwhile, 10CuSe/OMBC had strong magnetism that is not permanently magnetized, which could be separated from desulfurization gypsum and recycled many times. Characterization results demonstrated that Se, Cu and O played essential roles in the oxidation of Hg, and Se and Se can immobilize Hg to HgSe. 10CuSe/OMBC has important guiding significance for practical application because of its low cost, high performance and low mercury leaching characteristic to form HgSe.
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| http://dx.doi.org/10.1016/j.jes.2024.07.018 | DOI Listing |
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