EARTH

[3801-11-05] MoS₂ Nanosheets with Widened Interlayer Spacing for High-Efficiency Removal of Mercury in Fule Gas

Cao Liu¹, Shu Yang¹, Cong Zhang¹, Zhiwen You¹, ○Hui Liu^1,2 (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

Chairman: Chompunoot Wiraseranee （Mitsubishi Materials Corporation）, Liu Hui (Central South University)

Keywords:Nano-MoS2, Elemental Mercury, Adsorption Removal, High Efficiency

The surface area and interlayer spacing of molybdenum disulfide (MoS₂) were successfully enlarged using nanostructure particles synthesized by hydrothermal method. The MoS₂ with the nanostructure and widened interlayer spacing (W-DR-N-MoS₂) of 32.3 m²·g^-1 was then used to remove gas-phase elemental mercury (Hg⁰) from simulated industrial flue gas at wide range of temperatures (50 to 200 °C). The W-DR-N-MoS₂ exhibited far greater Hg⁰ adsorption capacity than the conventional bulk MoS₂ sorbent due to nanosheets with widened interlayer spacing and the abundance of surface sulfur sites, which have a high binding affinity for Hg⁰. The adsorbed Hg⁰ could react with the surface sulfur to form a stable mercury compound, HgS, which was confirmed by X-ray photoelectron spectroscopy analysis and a temperature-programmed desorption test. At the medium temperature of 150 °C, the adsorption efficiency of W-DR-N-MoS₂ was higher than 80% and the adsorption capacity was much greater than 3960 μg/g after 50 hours. With this excellent Hg⁰ removal performance, it can be concluded that the W-DR-N-MoS₂ showed great potential to be applied in industrial conditions for the removal of mercury as well as the recovery of mercury as a resource.