Journal
ENERGY & FUELS
Volume 35, Issue 17, Pages 13975-13983Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c02150
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Funding
- National Natural Science Foundation of China [51906078, 51922045]
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering [2021-K75]
- Fundamental Research Funds for the Central Universities [2021XXJS064]
- China Postdoctoral Science Foundation [2020M672342]
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In this study, a recyclable magnetic Ag-based sorbent for zero-valent mercury (Hg-0) removal was successfully prepared using CuS-wrapped Fe3O4 as the support and Ag as the loading material. The synthesized Ag/CuS@Fe3O4 sorbent exhibited excellent Hg-0 removal activity and resistance to SO2 at 50 degrees C. Characterization results showed that both Cu and S sites of CuS were active sites in the reaction process, providing high Hg-0 capture capacity. Meanwhile, the Ag species not only provided new activity sites but also improved the reactivity of Cu sites.
In this study, CuS-wrapped Fe3O4 was selected as the support for Ag loading to prepare a recyclable magnetic Agbased sorbent for zero-valent mercury (Hg-0) removal. The synthesized Ag/CuS@Fe3O4 sorbent showed outstanding Hg-0 removal activity and SO2 resistance at 50 degrees C. The Hg-0 capture capacity of Ag/CuS@Fe3O4 was 18.72 mu g g(-1) for 5 min, which was about 3.40 and 1.11 times higher than those of bare Fe3O4 and CuS@Fe3O4. Exposure of Ag/CuS@Fe3O4 to the simulated gas containing SO2 (0.05 v/v%) at 50 degrees C achieved the Hg-0 removal efficiency of >84% during 3 h activity test. Characterization results indicated that both Cu and S sites of CuS were active sites in the reaction process, providing high Hg-0 capture capacity. Meanwhile, the Ag species not only provided new activity sites but also improved the reactive activity of Cu sites due to the formation of ternary amalgam. In addition, the S sites were supplemented by SO2, which prevented the Ag active sites from being destructed by the formation of Ag2S.
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