首页>
外文期刊>Environmental Science & Technology: ES&T
>Novel Synergistic Effect of Fe and Mo in FeMoSx/TiO2 for Recovering High Concentrations of Gaseous Hg-0 from Smelting Flue Gas: Reaction Mechanism and Kinetics
【24h】
Novel Synergistic Effect of Fe and Mo in FeMoSx/TiO2 for Recovering High Concentrations of Gaseous Hg-0 from Smelting Flue Gas: Reaction Mechanism and Kinetics
There is a high demand for developing a more effective and environment-friendly technology to substitute the complicated and hazardous Boliden-Norzink technology for recovering gaseous Hg-0 from smelting flue gas. In this work, a low-cost and reproducible sorbent (FeMoSx/TiO2) was developed to recover gaseous Hg-0 from smelting flue gas. FeMoSx/TiO2 exhibited a superior ability for capturing high concentrations of Hg-0, with an adsorption rate of 72.2 mu g g(-1) min(-1) and a capacity of 41.8 mg g(-1) at 60 degrees C. These were generally larger than the sums of those of FeSx/TiO2 and MoSx/TiO2. The kinetic model of Hg-0 adsorption by FeSx/TiO2, MoSx/TiO2 and FeMoSx/TiO2 were constructed according to the adsorption mechanism. Then, the structure-activity relationship of FeMoSx/TiO2 for Hg-0 capture .was determined by comparing the kinetic parameters. The intrinsic adsorption of He by MoSx/TiO2 (i.e., physically adsorbed Hg-0 was oxidized by MoS(3)to HgS) was inhibited marginally after FeSx was incorporated. However, another Hg( )(0)adsorption route (i.e., physically adsorbed Hg-0 was oxidized by FeS2 to HgS) appeared on FeMoSx/TiO2. Its rate was significantly higher than that of FeSx/TiO2. Thus, a novel synergistic effect of Fe and Mo in FeMoSx/TiO2 for Hg-0 capture was observed.
展开▼
