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

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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.

Original languageEnglish
Pages (from-to)5004-5011
Number of pages8
JournalChemistry of Materials
Volume26
Issue number17
DOIs
Publication statusPublished - Sep 9 2014

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Hydroxides
Polysulfides
Vapors
Adsorption
Atomic emission spectroscopy
Gas fuel purification
Inductively coupled plasma
Mercury
Natural gas
X ray photoelectron spectroscopy
Spectroscopy
X ray diffraction
Scanning electron microscopy
polysulfide
Experiments

ASJC Scopus subject areas

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

Cite this

Efficient Hg vapor capture with polysulfide intercalated layered double hydroxides. / Ma, Shulan; Shim, Yurina; Islam, Saiful M.; Subrahmanyam, K. S.; Wang, Pengli; Li, Hao; Wang, Shichao; Yang, Xiaojing; Kanatzidis, Mercouri G.

In: Chemistry of Materials, Vol. 26, No. 17, 09.09.2014, p. 5004-5011.

Research output: Contribution to journalArticle

Ma, S, Shim, Y, Islam, SM, Subrahmanyam, KS, Wang, P, Li, H, Wang, S, Yang, X & Kanatzidis, MG 2014, 'Efficient Hg vapor capture with polysulfide intercalated layered double hydroxides', Chemistry of Materials, vol. 26, no. 17, pp. 5004-5011. https://doi.org/10.1021/cm5020477
Ma S, Shim Y, Islam SM, Subrahmanyam KS, Wang P, Li H et al. Efficient Hg vapor capture with polysulfide intercalated layered double hydroxides. Chemistry of Materials. 2014 Sep 9;26(17):5004-5011. https://doi.org/10.1021/cm5020477
Ma, Shulan ; Shim, Yurina ; Islam, Saiful M. ; Subrahmanyam, K. S. ; Wang, Pengli ; Li, Hao ; Wang, Shichao ; Yang, Xiaojing ; Kanatzidis, Mercouri G. / Efficient Hg vapor capture with polysulfide intercalated layered double hydroxides. In: Chemistry of Materials. 2014 ; Vol. 26, No. 17. pp. 5004-5011.
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