Polymer-Inorganic Coatings Containing Nanosized Sorbents Selective to Radionuclides. 1. Latex/Cobalt Hexacyanoferrate(II) Composites for Cesium Fixation

Abstract

Here we present a new approach to improve fixation of radionuclides on contaminated surfaces and eliminate their migration after nuclear accidents. The approach consists in fabrication of latex composite coatings, which combine properties of polymeric dust-suppressors preventing radionuclides migration with aerosols and selective inorganic sorbents blocking radionuclides leaching under contact with ground waters and atmospheric precipitates. Latex/cobalt hexacyanoferrate(II) (CoHCF) composites selective to cesium radionuclides were synthesized via "in situ" growth of CoHCF crystal on the surface of carboxylic or amino latexes using surface functional groups as ion-exchange centers for binding precursor ions Co(2+) and [Fe(CN)6](4-). Casting such composite dispersions with variable content of CoHCF on (137)Cs-contaminated sand has yielded protective coatings, which reduced cesium leaching to 0.4% compared to 70% leaching through original latex coatings. (137)Cs migration from the sand surface was efficiently minimized when the volume fraction of CoHCF in the composite film was as low as 0.46-1.7%.

Hierarchy of Hybrid Materials—The Place of Inorganics-in-Organics in it, Their Composition and Applications

“…Subsequently, release has been realized by ultrasound, where metal nanoparticles in PEM layers increased the density of the shell. Furthermore, capabilities of organic/inorganic interfaces for LbL have been shown to act as sorbents of radionucleotides (Bratskaya et al, 2014), UV responsiveness of polymeric layers was shown to be enhanced by the addition of an inorganic content (Katagiri et al, 2009). The extension in dual responsiveness to UV and ultrasound by TiO 2 /polyelectrolyte layers has recently been demonstrated (Gao et al, 2016), while functionalization of phenolic networks with metals has allowed the increase of coating multifunctionality (Guo et al, 2014).…”

From well-defined poly( N -acryloylmorpholine)-stabilized nanospheres to uniform mannuronan- and guluronan-decorated nanoparticles by RAFT polymerization-induced self-assembly

“…By exploiting the ion-binding properties of (1→4)-α-L-guluronan and other glycuronans, [42,87] the approach depicted here could be used to produce film-forming latexes suitable for the fabrication of dust suppressing coatings for the response to a radiation dispersal accident: They would combine the properties of protective polymer films [88,89] and those of a selective sorbent to increase efficiency of radionuclides fixation after nuclear accidents. [90,91]…”

Flexible cobalt hexacyanoferrate/carbon cloth nanocomposites for H2O2 detection

“…[3][4][5][6] To overcome these disadvantages, nanomaterials as a kind of alternative electrochemical catalysts have attracted intense attention for construction of nonenzymatic H 2 O 2 sensors due to their promising electrocatalytic activity, high specic surface area, various morphologies and low cost. 7 Metal hexacyanoferrates (MHCFs), as a kind of polynuclear mixed-valence compounds with an open zeolite-like structure, [8][9][10] have been widely applied in the removal of radioactive metals, [11][12][13][14] energy storage, 15,16 electrochromic devices, sensors [17][18][19] and biosensors. [20][21][22][23] Among the MHCFs, cobalt hexacyanoferrate (CoHCF) received special attention 16,20,24,25 owing to its tremendous multifunctional properties such as ion exchange, photo-induced magnetism and excellent electrocatalytic activity.…”