Mercury separation from concentrated potassium iodide/iodine leachate using Self-Assembled Mesoporous Mercaptan Support (SAMMS) technology

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A study was conducted to demonstrate the effectiveness of a novel adsorber, the Self-Assembled Mesoporous Mercaptan Support (SAMMS) material to remove mercury (Hg) from potassium iodide/iodine (KI/I{sub 2}) waste streams. This study included investigations of the SAMMS material`s binding kinetics, loading capacity, and selectivity for Hg adsorption from surrogate and actual KI/I{sub 2} waste solutions. The kinetics data showed that binding of Hg by the adsorber material occurs very rapidly, with 82% to 95% adsorption occurring within the first 5 min. No significant differences in the rate of adsorption were noted between pH values of 5 and 9 and at ... continued below

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31 p.

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Mattigod, S.V.; Feng, X. & Fryxell, G.E. October 1, 1997.

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  • Pacific Northwest Laboratory
    Publisher Info: Pacific Northwest Lab., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

A study was conducted to demonstrate the effectiveness of a novel adsorber, the Self-Assembled Mesoporous Mercaptan Support (SAMMS) material to remove mercury (Hg) from potassium iodide/iodine (KI/I{sub 2}) waste streams. This study included investigations of the SAMMS material`s binding kinetics, loading capacity, and selectivity for Hg adsorption from surrogate and actual KI/I{sub 2} waste solutions. The kinetics data showed that binding of Hg by the adsorber material occurs very rapidly, with 82% to 95% adsorption occurring within the first 5 min. No significant differences in the rate of adsorption were noted between pH values of 5 and 9 and at Hg concentrations of {approximately}100 mg/1. Within the same range of pH values, an approximate four-fold increase in initial Hg concentration resulted in a two-fold increase in the rate of adsorption. In all cases studied, equilibrium adsorption occured within 4 h. The loading capacity experiments in KI/I{sub 2} surrogate solutions indicated Hg adsorption densities between 26 to 270 mg/g. The loading density increased with increasing solid: solution ratio and decreasing iodide concentrations. Values of distribution coefficients (1.3x10{sup 5} to >2.6x10{sup 8} ml/g) indicated that material adsorbs Hg with very high specificity from KI/I{sub 2} surrogate solutions. Reduction studies showed that compared to metallic iron (Fe), sodium dithionite can very rapidly reduce iodine as the triiodide species into the iodide form. Adsorption studies conducted with actual KI/I{sub 2} leachates confirmed the highly specific Hg adsorption properties (K{sub d}>6x10{sup 7} to>1x10{sup 8} ml//g) of the adsorber material. Following treatment, the Hg concentrations in actual leachates were below instrumental detection limits (i.e., < 0.00005 mg/l), indicating that the KI solutions can be recycled.

Physical Description

31 p.

Notes

INIS; OSTI as DE98050091

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  • Other Information: PBD: Oct 1997

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  • Other: DE98050091
  • Report No.: PNNL--11714
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/565357 | External Link
  • Office of Scientific & Technical Information Report Number: 565357
  • Archival Resource Key: ark:/67531/metadc691613

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • June 13, 2016, 8:13 p.m.

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Mattigod, S.V.; Feng, X. & Fryxell, G.E. Mercury separation from concentrated potassium iodide/iodine leachate using Self-Assembled Mesoporous Mercaptan Support (SAMMS) technology, report, October 1, 1997; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc691613/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.