Polymer–Inorganic Coatings Containing Nanosized Sorbents Selective to Radionuclides. 2. Latex/Tin Oxide Composites for Cobalt Fixation

Abstract

Colloidal tin oxide with an average particle size of 3.5 nm, which was ex-situ synthesized by the sol-gel method, has been attached to the surface of amino-functionalized poly(acrylate-co-silane) latex particles with a diameter of 100 nm to yield a composite with selective sorption properties toward Co(2+) ions. Electrokinetic properties and the colloidal stability of the synthesized latex/SnO2 composites have been evaluated in dependence on SnO2 content and pH; the sorption capacity and distribution coefficients of composites for Co(2+) ions were in accordance with the SnO2 content and its sorption performance as an individual compound. Composite coatings obtained by casting latex/SnO2 dispersions on quartz sand spiked with (57)Co radionuclide have efficiently eliminated radionuclides migration from the surface when the SnO2 volume fraction in the film was 3.5-4.7%. Furthermore, at these SnO2 loadings, the composite coatings retained the coherent structure of the original latex coating with SnO2 particles homogeneously distributed over the film thickness. The presence of competing Ca(2+) ions in the leaching media at a concentration of above 0.01 mol/L results in a decrease of the distribution coefficients of the latex/SnO2 composite and significantly higher (57)Co leaching. The value of the distribution coefficient of the sorption material to be used in latex composite coatings to prevent migration of radionuclides shall be close to 10(6) mL/g.

Light Harvesting Nanoprobe for Trace Detection of Hg2+ in Water

“…Sensitivity enhancement of the probe after immobilization in the coatings can be related to the metal ions preconcentration on the carboxylic group of the siloxane-acrylate latex, which was earlier demonstrated by our group [ 33 ]. Furthermore, despite a hydrophobicity sufficient to prevent fluorophore release to the aqueous solution and the high stability of the siloxane-acrylate coatings in aqueous solutions at pH < 11, they were permeable for metal ions [ 34 , 35 ]. A large excess of carboxylic groups in the coating did not interfere with the sensory response due to the much higher binding constant of Hg 2 with S-containing ligand ( d114 ).…”

One-step fabrication of 3-methacryloxypropyltrimethoxysilane modified silica and investigation of fluorinated polyacrylate/silica nanocomposite films

“…[1][2][3][4][5][6][7][8][9][10] These nanocomposite materials are particularly promising in applications as catalysis, 11,12 surface coatings [13][14][15][16] and biotechnologies. 17 A number of approaches have been demonstrated for generating nanocomposite particles with different interesting morphologies, such as core-shell, 18,19 raspberry-like, [20][21][22][23][24] daisy-shaped, 25 currant bun-like 26 and snowman-like 27 structures.…”

“…Polymer/inorganic nanocomposite particles have gained much attention from scientists owing to the remarkable properties that can be obtained by the combination and structuration of the organic and inorganic components inside the nanoparticles. [1][2][3][4][5][6][7][8][9][10] These nanocomposite materials are particularly promising in applications such as catalysis, 11,12 surface coatings [13][14][15][16] and biotechnologies. 17 A number of approaches have been demonstrated for generating nanocomposite particles with different interesting morphologies, such as core-shell, 18,19 raspberry-like, [20][21][22][23][24] daisy-shaped, 25 currant bun-like 26 and snowman-like 27 structures.…”