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Development of high-performance MoS2 with nanofoam architecture for gaseous elemental mercury sequestration: The key role of edge sulfur vacancy
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.cej.2024.158786 Yixuan Liu, Licong Guan, Yuxin Tu, Zesheng Ruan, Jiahuang Chen, Zhifeng Xu, Ruixiang Wang, Hui Liu, Zhilou Liu
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.cej.2024.158786 Yixuan Liu, Licong Guan, Yuxin Tu, Zesheng Ruan, Jiahuang Chen, Zhifeng Xu, Ruixiang Wang, Hui Liu, Zhilou Liu
Two-dimensional MoS2 materials exhibit considerable promise for elemental mercury adsorption. However, challenges persist to identify the intrinsic active site in MoS2 adsorbent for Hg0 immobilization. In this work, three MoS2 samples with different sulfur vacancy concentrations and sulfur vacancy species, namely few-layer MoS2, multi-layer MoS2, and edge-rich MoS2, were engineered to confirm the pivotal active ligand for Hg0 capture performance. Theoretical calculation combined with multiple characterizations confirm the critical role of edge sulfur vacancy for Hg0 sequestration. MoS2 with rich edge sulfur vacancies demonstrates commendable Hg0 adsorption performance at elevated temperatures, achieving an average adsorption rate of 7.07 μg/g/min, higher than few-layer MoS2 with rich in-plane sulfur vacancies. The Hg0 adsorption capacity of edge-rich MoS2 achieves 27.62 mg/g at a breakthrough threshold of 25 %, surpassing the capabilities of most reported metal sulfide adsorbents. Moreover, Hg0 is peculiarly prone to combine with unsaturated Mo ligand on the edge sulfur vacancy to form Hg-Mo amalgam, then reacts with neighboring sulfide ligand to form stable HgS. Besides, high thermal stability of active sulfide ligand on the edge sulfur vacancy endows the edge-rich MoS2 with a wide temperature range. This research offers a new insight on the rational adsorbent design of metal sulfides for mercury pollution control.
更新日期：2024-12-20
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