Efficient Hg Vapor Capture with Polysulfide Intercalated Layered Double Hydroxides
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- 作者：Shulan Ma ; Yurina Shim ; Saiful M. Islam ; K. S. Subrahmanyam ; Pengli Wang ; Hao Li ; Shichao Wang ; Xiaojing Yang ; Mercouri G. Kanatzidis
- 刊名：Chemistry of Materials
- 出版年：2014
- 出版时间：September 9, 2014
- 年：2014
- 卷：26
- 期：17
- 页码：5004-5011
- 全文大小：499K
- ISSN：1520-5002
文摘
We report detailed studies showing that the novel layered polysulfide compounds Sx-LDH (Sx2鈥?/sup>, polysulfides, x = 2, 4, 5; LDH, Mg鈥揂l layered double hydroxides) can capture efficiently large quantities of mercury (Hg0) vapor. During the adsorption process, the interlayer polysulfides [Sx]2鈥?/sup> react with Hg0 through their S鈥揝 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 脳 105, 7.4 脳 105, and 1.0 脳 106 渭g/g, respectively, corresponding to 50鈥?00% 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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