Efficient Hg vapor capture with polysulfide intercalated layered double hydroxides

Shulan Ma, Yurina Shim, Saiful M. Islam, K. S. Subrahmanyam, Pengli Wang, Hao Li, Shichao Wang, Xiaojing Yang, Mercouri G. Kanatzidis

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5004-5011
Number of pages8
JournalChemistry of Materials
Issue number17
Publication statusPublished - Sep 9 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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