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Gaseous Elemental Mercury Capture by Magnetic FeS2 Nanorods Synthesized via a Molten Salt Method.
- Source :
- ACS Applied Nano Materials; 2/25/2022, Vol. 5 Issue 2, p2626-2635, 10p
- Publication Year :
- 2022
-
Abstract
- Coal burning emits a significant amount of elemental mercury (Hg<superscript>o</superscript>) into the atmosphere, which can cause severe damage to the environment and human health. Here, magnetic FeS<subscript>2</subscript> nanorods are facilely obtained via a low-temperature (200–350 °C) molten salt (KSCN) route. The annealing temperature is found to notably affect the structure and Hg<superscript>o</superscript> capture performance of FeS<subscript>2</subscript>, while precursors exert subtle effects on the mercury adsorption performance. The Hg<superscript>o</superscript> capture ability of FeS<subscript>2</subscript> first increases and then decreases with increasing annealing temperature. The highest magnetism (12 emu/g) and optimal mercury capture performance (Hg<superscript>o</superscript> removal efficiency of 96.2%) are achieved over FeS<subscript>2</subscript> nanorods synthesized at 250 °C. This material shows superior performance in the temperature range of 60–180 °C owing to its rod-like structure with ample number of exposed adsorption sites. NO and SO<subscript>2</subscript> are found to only slightly intervene in the mercury removal process. Hg<superscript>o</superscript> vapor first adsorbs on the FeS<subscript>2</subscript> surface via physical adsorption followed by conversion into mercury sulfide (HgS) and mercury oxide (HgO) by the oxidation of disulfide ions (S<subscript>2</subscript><superscript>2–</superscript>) and chemisorbed oxygen (O*) species, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 25740970
- Volume :
- 5
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- ACS Applied Nano Materials
- Publication Type :
- Academic Journal
- Accession number :
- 155959822
- Full Text :
- https://doi.org/10.1021/acsanm.1c04293