title: Selective capture of cesium and thallium from natural waters and simulated wastes with copper ferrocyanide functionalized mesoporous silica.
abstract: Copper(II) ferrocyanide on mesoporous silica (FC-Cu-EDA-SAMMS) 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.
authors.affiliation: Biomedical Engineering, Oregon Health & Science University School of Medicine, Portland, OR 97239, United States.
authors.forename: Thanapon
authors.initials: T
authors.lastname: Sangvanich
authors.forename: Vichaya
authors.initials: V
authors.lastname: Sukwarotwat
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Wiacek
authors.forename: Rafal M
authors.initials: RM
authors.lastname: Grudzien
authors.forename: Glen E
authors.initials: GE
authors.lastname: Fryxell
authors.forename: R Shane
authors.initials: RS
authors.lastname: Addleman
authors.forename: Charles
authors.initials: C
authors.lastname: Timchalk
authors.forename: Wassana
authors.initials: W
authors.lastname: Yantasee
mesh_terms: D000327:Adsorption; D002586:Cesium / Q000302:isolation & purification*; D005295:Ferrocyanides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012822:Silicon Dioxide / Q000737:chemistry*; D013793:Thallium / Q000302:isolation & purification*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D005295:Ferrocyanides; D014874:Water Pollutants, Chemical; D014867:Water; D002586:Cesium; D012822:Silicon Dioxide; C039105:cupric ferrocyanide; D013793:Thallium