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首页> 外文期刊>Environmental Science & Technology: ES&T >Edge-Enriched Molybdenum Disulfide Ultrathin Nanosheets with a Widened Interlayer Spacing for Highly Efficient Gaseous Elemental Mercury Capture
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Edge-Enriched Molybdenum Disulfide Ultrathin Nanosheets with a Widened Interlayer Spacing for Highly Efficient Gaseous Elemental Mercury Capture

机译：Edge-Enriched Molybdenum Disulfide Ultrathin Nanosheets with a Widened Interlayer Spacing for Highly Efficient Gaseous Elemental Mercury Capture

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摘要

Transition metal sulfides have exhibited remarkable advantages in gaseous elemental mercury (Hg~0) capture under high SO2 atmosphere, whereas the weak thermal stability significantly inhibits their practical application. Herein, a novel N,N-dimethylfbrmamide (DMF) insertion strategy via crystal growth engineering was developed to successfully enhance the Hg~0 capture ability of MoS2 at an elevated temperature for the first time. The DMF-inserted MoS2 possesses an edge-enriched structure and an expanded interlayer spacing (9.8 A) and can maintain structural stability at a temperature as high as 272 °C. The saturated Hg~0 adsorption capacities of the DMF-inserted MoS2 were measured to be 46.91 mg·g~(-1) at 80 °C and 27.40 mg·g~(-1) at 160 °C under high SO2 atmosphere. The inserted DMF molecules chemically bond with MoS2, which prevents possible structural collapse at a high temperature. The strong interaction of DMF with MoS2 nanosheets facilitates the growth of abundant defects and edge sites and enhances the formation of Mo~(5+)/Mo~(6+) and S2~(2-) species, thereby improving the Hg~0 capture activity at a wide temperature range. Particularly, Mo atoms on the (100) plane represent the strongest active sites for Hg~0 oxidation and adsorption. The molecule insertion strategy developed in this work provides new insights into the engineering of advanced environmental materials.

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