Efficient Removal of Elemental Mercury from Coal-Fired Flue Gas in a Wide Temperature Range by Fe3O4 Attached to the CuSe Surface

Haodong Jia,Enqi Shi,Ping He, Jiang Wu,Naichao Chen,Changyu Pan,Aofei Wang, Kangsai He,Tianyang Hu, Qian Cai, Rui Shen

ENERGY & FUELS(2023)

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摘要
The adsorbent technique is one of the common methods used to capture elemental mercury from industrial flue gases. In this paper, CuSe/Fe3O4 (CF) was constructed by the hydrothermal method, and the surface area of the adsorbent (CF-25) reached 138.7626 m2 g-1 when the mass ratio of Fe3O4 was 25 wt %, and its performance for mercury removal was also optimal. The diselenide ligand (Se22-) from CuSe and the oxygen functional group (OL) from Fe3O4 contributed to the immobilization of Hg0. The mercury removal efficiency of CF-25 could reach 92% on average at 40-300 degrees C, and the adsorption capacity of CF-25 for mercury at 240 degrees C was 56.0224 mg g-1. In the cycling experiments, CF-25 was able to absorb 92.7% of the mercury and possessed a high recovery rate. In addition, the adsorbent exhibited excellent sulfur resistance. The outstanding mercury removal performance, high recyclability, and excellent sulfur resistance make CF-25 a promising adsorbent.
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