Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 182, Issue 1-3, Pages 225-231Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.06.019
Keywords
Ferrocyanide; Mesoporous silica; Cesium; Thallium; Prussian Blue
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Funding
- National Institute of Allergy and Infectious Disease (NIAID) [R01 AI074064]
- National Institute of Environmental Health Sciences (NIEHS) [R21 ES015620]
- Department of Energy's Office of Biological and Environmental Research
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Copper(II) ferrocyanide on mesoporous silica (FC-Cu-EDA-SAMMS (TM)) has been evaluated against iron(III) hexacyanoferrate(II) (insoluble Prussian Blue) for removing cesium (Cs+) and thallium (Tl+) from natural waters and simulated acidic and alkaline wastes. From pH 0.1-7.3, FC-Cu-EDA-SAMMS had greater affinities for Cs and Tl and was less affected by the solution pH, competing cations, and matrices. SAMMS also outperformed Prussian Blue in terms of adsorption capacities (e.g., 21.7 versus 2.6 mg Cs/g in acidic waste stimulant (pH 1.1), 28.3 versus 5.8 mg Tl/g in seawater), and rate (e.g., over 95 wt% of Cs was removed from seawater after 2 min with SAMMS, while only 75 wt% was removed with Prussian Blue). SAMMS also had higher stability (e.g., 2.5-13-fold less Fe dissolved from 2 to 24 h of contact time). In addition to environmental applications, SAMMS has great potential to be used as orally administered drug for limiting the absorption of radioactive Cs and toxic Tl in gastrointestinal tract. (C) 2010 Elsevier B.V. All rights reserved.
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