Cu/FeSx modified AC for removing gaseous elemental mercury from flue gas.

Mercury pollution from coal-fired power plants has always been an environmental concern, and adsorption technology is an effective method for Hg⁰ removal. In this study, copper-iron binary metal sulfide modified activated carbon ( CuFeS x / AC ) adsorbent was synthesized. The performance and mechanism of mercury removal were tested by adsorption experiments and characterization methods. The results showed that the mercury removal efficiency of Cu 2 Fe 1 S x / AC under simulated flue gas (SFG) conditions at 150 °C could reach 91%, which was higher than CuS x / AC and FeS x / AC . Compared with CuS x / AC , the introduction of Fe increased the proportion of Cu + , which was usually linked to S - , resulting in the generation of more CuS (Cu^IS^I) species. Meanwhile, the generation of active sulfur sites such as FeS 2 was generated, which had a facilitative effect on the oxidation of Hg⁰. Stable HgS was the predominant product on the adsorbent surface. The 2% sulfur loadings had significantly improved the sulfur resistance of conventional AC. [ABSTRACT FROM AUTHOR]