An Original “Click and Bind” Approach for Immobilizing Copper Hexacyanoferrate Nanoparticles on Mesoporous Silica

Abstract

We present an original approach for preparing silica-based nanocomposites containing Prussian blue-type nanoparticles via click chemistry. Click reaction is used to prepare a triazole-copper complex in a single step; this complex is subsequently used to anchor copper hexacyanoferrate nanoparticles within a porous silica matrix (porous glass pearls or SBA-15). This CuAAC "click reaction" was performed using a relatively large copper concentration for two reasons: First, the Cu catalyzes the triazole ring formation, then the ring acts as a chelator, immobilizing the copper inside the silica matrix. Successively adding hexacyanoferrate precursors that coordinate with the copper ions at the triazole sites led to efficient and selective nanocomposite formation; this material was developed to mitigate Cs + ion contamination. The efficiency of these asprepared nanocomposites and their selectivity for Cs + from different effluents, such as pure water, seawater, and radioactive seawater (simulating the Fukushima site), were evaluated using sorption experiments. These immobilized nanocomposites present a high Cs + selectivity while demonstrating a K d value above that of the bulk material.

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs+ adsorption capacity and selective recovery by flotation

“…where K is a dimensionless factor for crystal shape, taken to be 0.94 18 , is the X-ray wavelength (1.5406 Å for Cu K is the diffraction angle at the peak (rad), and is the full-width at halfmaximum height (FWHM, rad). The average crystallite size for the KCuHCF complexes was determined from the major peaks (at 17.9 o , 25.3 o and 36.1 o ), and using Eq.…”

“…Hexacyanoferrate(II) is an agent of high Cs + affinity and selectivity, with the small hydrated ions such as Cs + able to permeate through the cubic structure, while the larger competing ions are blocked from accessing the sorption sites [15][16][17][18] . However, the fine particle size of this type of adsorbent makes it difficult to separate from aqueous environments, so it is generally incorporated within supporting materials for effective Cs + adsorption and removal 15,19 .…”

Positively charged phosphonate-functionalized mesoporous silica for efficient uranium sorption from aqueous solution

“…3-Chloropropyltrimethoxysilane (98%) was purchased from J&K Scientific Ltd., and used as received. 3-Azidopropyltrimethoxysilane was synthesized according to the reported reference [37] (Fig. S1, Supporting information).…”

Adsorption of Cs from Water on Surface-Modified MCM-41 Mesosilicate

“…This sorbent has been applied in various aqueous system to remediate textile dye and heavy metals, such as Cu 2+ (adsorption capacity of 61 mg/g), Zn 2+ (87 mg/g), and Pb 2+ (82 mg/g) (Valle-Vigón et al 2013). SBA-15 (Santa Barbara Amorphous, mesosilica material) also becomes an efficient sorbent for Cs when bounded to Prussian Blue ([Fe(CN) 6 ] 3+ ) (Turgis et al 2013).…”