Abstract
Selective screening followed by the sensing of cesium radionuclides from contaminated water is a challenging technical issue. In this study, the adsorption functionality of Prussian blue (PB) nanoparticles was utilized for the detection and efficient removal of cesium cations. An efficient PB nanoparticle-modified screen-printed electrode (SPE) in the three-electrode configuration was developed for the electrochemical sensing and removal of Cs+. PB nanoparticles inks were obtained using a facile two-step process that was previously described as suitable for dispensing over freshly prepared screen-printed electrodes. The PB nanoparticle-modified SPE induced a cesium adsorption-dependent chronoamperometric signal based on ion exchange as a function of cesium concentration. This ion exchange, which is reversible and rapid, is associated with electron transfer in the PB nanoparticle-modified SPE. Using this electrochemical adsorption system (EAS) based on chronoamperometry, the maximum adsorption capacity (Qmax) of Cs+ ions in the PB nanoparticle-modified SPE reached up to 325 ± 1 mg·g−1 in a 50 ± 0.5 μM Cs+ solution, with a distribution coefficient (Kd) of 580 ± 5 L·g−1 for Cs+ removal. The cesium concentration-dependent adsorption of PB nanoparticles was also demonstrated by fluorescence spectroscopy based on fluorescence quenching of PB nanoparticles as a function of cesium concentration using a standard fluorophore like fluorescein in a manner analogous to that previously reported for As(III).
Highlights
Published: 7 September 2021The Fukushima Daiichi nuclear disaster was associated with the release of radionuclidecontaining water, including 940 TBq of radioactive cesium (137 Cs), into the sea
The conventional synthesis of Prussian blue (PB) is followed by agglomeration of nuclei into large particles; this phenomenon is associated with the poor processability of PB into PB filmmodified electrodes [13,14]
We have already demonstrated that the organic reagent tetrahydrofuran in the presence of hydrogen peroxide enabled the conversion of K3 [Fe(CN)6 into PB nanoparticles [16]
Summary
Published: 7 September 2021The Fukushima Daiichi nuclear disaster was associated with the release of radionuclidecontaining water, including 940 TBq of radioactive cesium (137 Cs), into the sea. Many adsorbent materials (e.g., clay minerals and metal oxides) have been evaluated in terms of their capability for removing 137 Cs from contaminated water [1,2,3,4,5,6,7,8,9,10,11]. Many of these conventional adsorbents are too expensive for use in large-scale applications or are too difficult to synthesize. Many reports on the use of PB and its analogs have demonstrated the removal of cesium ions [4,5,6,7,8,9,10,11]
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