Abstract
Herein, MoS2 was used in a MoS2/H2O heterogeneous system for the heterogeneously catalyzed removal of Hg0 from flue gas. Hg0 removal efficiency reached 77.6% at 25 °C when the dosage of MoS2 was 0.200 g/L in aqueous suspension. The observed effects of MoS2 dosage and inlet Hg0 concentration on Hg0 removal efficiency revealed that the gas–liquid mass transfer process is the limiting step of Hg0 removal. Low pH and low temperature were conducive to Hg0 removal. SO2 in the flue gas was absorbed by MoS2, and the simultaneous decrease in solution pH resulted in a slight increase in Hg0 removal efficiency. The presence of NO in the flue gas enhanced Hg0 removal efficiency. Common anions, such as NO3−, SO42−, and CO32−, have no obvious effect on Hg0 removal. However, Cl− improved Hg0 removal efficiency by 11% because of the production of HgCln2−n. The kinetics and mechanism of Hg0 removal were studied, and the results indicated that Mo acted as a bridge and catalyst for Hg0 oxidation, while S immobilized Hg2+ by formation of HgS on MoS2.
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