期刊
ACS ES&T ENGINEERING
卷 1, 期 8, 页码 1258-1266出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsestengg.1c00156
关键词
Oxygen incorporation; Disorder engineering; MoS2 nanosheets; Nonferrous smelting flue gas; Mercury adsorption
资金
- National Natural Science Foundation of China [51722407]
- Science and Technology Project of Hunan Province [2019RS3006]
- Innovative Research and Development Institute of Guangdong [2018B090902009]
The development of a sorbent with a large elemental mercury adsorption capacity under high SO2 concentration atmosphere is crucial for controlling mercury emissions. Through controlling crystallization, oxygen incorporation, and disorder engineering, the Hg-0 adsorption capacity of MoS2 nanosheets was significantly improved. The optimized structural and chemical properties provide an effective strategy to enhance the Hg-0 adsorption capacity of MoS2 nanosheets.
The development of a sorbent with a large elemental mercury (Hg-0) adsorption capacity under a high SO2 concentration atmosphere is the key point for mercury emission control from nonferrous smelting (NFS) flue gas. By controlling the degree of crystallization, oxygen incorporation and disorder engineering were simultaneously realized to improve the Hg-0 adsorption capacity of MoS2 nanosheets for the first time. The interlayer spacing of oxygen-incorporated MoS2 nanosheets reaches up to 9.4 A from 6.4 A of normal MoS2 nanosheets, which enhances the exposure of the active sites. Oxygen-incorporated MoS2 nanosheets display a disordered structure, indicating the declined crystallinity and increased active sites. Benefiting from the above synergistic advantages, oxygen incorporation and structure disorder increases significantly the equilibrium Hg-0 adsorption capacity of MoS2 nanosheets to 16.26 mg.g(-1) under 6% SO2 atmosphere, which is about 2.5 times larger than that of normal MoS2 nanosheets. Both external mass transfer and chemisorption control He adsorption on MoS2. Surface Mo5+ and S-2(2-) act as the main active sites generated by disorder engineering for capturing Hg-0, and HgS is the final product of Hg-0 adsorption. The simultaneous optimization of structural and chemical properties in this work provides an effective and convenient strategy to improve the He adsorption capacity of MoS2 nanosheets.
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