期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 339, 期 -, 页码 368-377出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.06.051
关键词
Periodic mesoporous organosilicas; Thiol-functionality; Hg-adsorption; Mercury thiolate nanocrystals; Regeneration
资金
- F.W.O. Flanders (Fund Scientific Research) [3E10813W]
- F.W.O. Flanders [G006813N]
- research Board of Ghent University, UGent GOA (Concerted Research Actions) [01G00710]
- Spanish Ministry of Economy and Competitiveness [MAT2013-44463-R]
- Andalusian Regional Government (FQM-346 group)
- Feder Funds
- Hercules foundation of the Flemish government
- Belgian IAP-PAI network
Highly ordered thiol-ethylene bridged Periodic Mesoporous Organosilicas were synthesized directly from a homemade thiol-functionalized bis-silane precursor. These high surface area materials contain up to 4.3 mmol/g sulfur functions in the walls and can adsorb up to 1183 mg/g mercury ions. Raman spectroscopy reveals the existence of thiol and disulfide moieties. These groups have been evaluated by a combination of Raman spectroscopy, Ellman's reagent and elemental analysis. The adsorption of mercury ions was evidenced by different techniques, including Raman, XPS and porosimetry, which indicate that thiol groups are highly accessible to mercury. Scanning transmission electron microscopy combined with EDX showed an even homogenous distribution of the sulfur atoms throughout the structure, and have revealed for the first time that a fraction of the adsorbed mercury is forming thiolate nanocrystals in the pores. The adsorbent is highly selective for mercury and can be regenerated and reused multiple times, maintaining its structure and functionalities and showing only a marginal loss of adsorption capacity after several runs. (C) 2017 Elsevier B.V. All rights reserved.
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