Efficient Hg Vapor Capture with Polysulfide Intercalated Layered Double Hydroxides
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Abstract
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 by control experiments with K2S4, S8, LDH-NO3-CoS4, and MgAl-NO3-LDH.
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