Nano-bubble molybdenum-based selenium-sulfur composite adsorbent for efficient removal of gaseous elemental mercury...

Two-dimensional material molybdenum disulfide exhibits excellent resistance to complex flue gas components and demonstrates a highly efficient capacity for mercury capture, positioning it as a promising adsorbent for Hg⁰. However, the limited availability of active adsorption sites hampers the pollution accommodation capacity for Hg⁰. This study introduces a novel approach to fully expose the unsaturated coordination active sites of molybdenum disulfide through morphological regulation and selenium doping. The synthesized NF-MoS_1.3Se_0.7 effectively captures Hg⁰ across a broad temperature spectrum, with notably enhanced adsorption capacity at elevated temperatures. At 100 ℃, the NF-MoS_1.3Se_0.7 adsorbent demonstrated an Hg⁰ adsorption capacity of 988.42 mg/g at a gas flow rate of 600 mL/min, which significantly surpasses the adsorption capacities of most transition metal materials. Experimental results and characterizations reveal that this method promotes the formation of edge defect sites and enhances the synergistic effects between Se and S ions. The formed Se-S_n^2- ligand is composed of many edge-unsaturated coordination sulfur and surface active selenium, playing a key role in maintaining the structural stability and adsorption activity of the adsorbent at high temperatures. This research not only provides an effective adsorbent for smelting flue gas, but also lays a foundation for the development of environmental protection functional materials.