Efficient Hg Vapor Capture with Polysulfide Intercalated Layered Double Hydroxides
| Autor: | Pengli Wang, Shichao Wang, Saiful Islam, Hao Li, Kota S. Subrahmanyam, Xiaojing Yang, Mercouri G. Kanatzidis, Yurina Shim, Shulan Ma |
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| Rok vydání: | 2014 |
| Předmět: |
Scanning electron microscope
General Chemical Engineering Inorganic chemistry Layered double hydroxides chemistry.chemical_element General Chemistry engineering.material Mercury (element) chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy chemistry Inductively coupled plasma atomic emission spectroscopy Materials Chemistry engineering Spectroscopy Polysulfide |
| Zdroj: | Chemistry of Materials. 26:5004-5011 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm5020477 |
| Popis: | We report detailed studies showing that the novel layered polysulfide compounds Sx-LDH (Sx2–, polysulfides, x = 2, 4, 5; LDH, Mg–Al layered double hydroxides) can capture efficiently large quantities of mercury (Hg0) vapor. During the adsorption process, the interlayer polysulfides [Sx]2– react with Hg0 through their S–S bond to produce HgS. The structure of Sx-LDH before and after Hg-adsorption was characterized with X-ray diffraction, vibration spectroscopy, and scanning electron microscopy. The presence of adsorbed Hg was verified by weight gain, inductively coupled plasma atomic emission spectroscopy and X-ray photoelectron spectroscopy. Despite their relatively low surface areas, the S2-LDH, S4-LDH, and S5-LDH samples show excellent Hg capture capacities of 4.9 × 105, 7.4 × 105, and 1.0 × 106 μg/g, respectively, corresponding to 50–100% adsorption rates by weight, highlighting the potential of these materials in natural gas purification. The Hg-capture efficiency and mechanism in Sx-LDH are supported... |
| Databáze: | OpenAIRE |
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