Novel Polymeric Chelating Fibers for Selective Removal of Mercury and Cesium from Water

Abstract

We report here the synthesis and characterization of two new classes of chelating fibers, namely, (1) polymercaptopropylsilsesquioxane (PMPS) and (2) copper(II) ferrocyanide complexed with poly[1-(2-aminoethyl)-3-aminopropyl]silsesquioxane (Cu-FC-PAEAPS) fibers. These fibers were evaluated for selective removal of trace amount of mercury and cesium ions respectively in the presence of competing metal ions from water. The PMPS and Cu-FC-PAEAPS fibers were prepared by coating their corresponding soluble prepolymers, which are derived from mercaptopropyltrimethoxysilane and [1-(2-aminoethyl)-3-aminopropyl]trimethoxysilane monomers, respectively, on a glass fiber substrate, followed by a cross-linking step at 120 degrees C. The fibers were characterized through infrared spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). These novel materials are extremely efficient in removing low concentrations of mercury and cesium ions from water in the presence of high concentrations of sodium or potassium ions. They were shown to remove trace mercury and cesium contaminants effectively to well below parts per billion concentrations under a variety of conditions.

H2xMnxSn3‐xS6 (x = 0.11–0.25): A Novel Reusable Sorbent for Highly Specific Mercury Capture Under Extreme pH Conditions

“…The tremendous affinity of LHMS-1 for Hg 2þ is reflected in the calculated (from the equilibrium exchange data) distribution coefficient K d Hg values ranging from 1.49 Â 10 6 to 6.41 Â 10 6 mL g À1 . These K d values for LHMS-1 exceed those reported for commercial resins (10 4 -5.10 Â 10 5 mL g À1 ) [8c,21] and silane chelating fibers (3.00 Â 10 5 -3.80 Â 10 6 mL g À1 ) [22] . In addition, they are well comparable with the K d Hg values for chalcogel-1 (9.5 Â 10 6 -1.6 Â 10 7 ) [14] and for mesoporous thiol-functionalized silicates (3.40 Â 10 5 -1.01 Â 10 8 mL g À1 ).…”

Adsorption of Hg2+ on a novel chelating fiber prepared by preirradiation grafting and amination

“…Therefore, mercury remediation has become a critical global need. A number of methods have been explored for the remediation of mercury pollution 6–15. The adsorption process is one effective technique that has been successfully used for metal removal from wastewater.…”

The removal of mercury from water by open chain ligands containing multiple sulfurs

“…Filters of various types can be used to remove mercury [25][26][27][28][29][30][31][32][33][34][35][36]. While many of these are very effective, they all require that the contaminated water be diverted through the filter at a controlled rate.…”