Abstract
Removal of mercury particularly from coal-fired plants and incinerators is of great significance to human health due to its high toxicity, volatility, and bioaccumulation. The Hg emitted from carbonaceous fuel combustion readily diffuses throughout the process. In other words, the capacity for capturing Hg at elevated-temperature conditions is higher than that at ambient temperatures. Herein, we report the preparation of a novel sorbent with a layered structure M–Al–CO3 via the coprecipitation of M2+ and Al3+ in an alkaline solution of NaOH/Na2CO3, where M2+ = Mg2+, Zn2+, Cu2+, and Mn2+ ions. The results showed that the rate of Hg removal could be significantly enhanced by incorporating transition metal ions into the porous materials. In a hydrothermal reactor, Mn–Al–CO3 nanoparticles exhibited the maximum Hg uptake above 10 mg/g among these materials, which was due to the higher oxidation potential of MnO2. Mercury removal capacity increased with Mn–Al ratio from 1:1 to 30:1 at temperatures ranging 30̊C–250̊C. These results demonstrate the potential of such synthetic Hg sorbents under medium–high temperature conditions.
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