Electrochemical Sensing and Removal of Cesium from Water Using Prussian Blue Nanoparticle-Modified Screen-Printed Electrodes

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).

Microneedle‐Integrated Device for Transdermal Sampling and Analyses of Targeted Biomarkers

“…The protocol used for Pd@Au synthesis was reported in our previous studies. [26,29,[67][68][69][70][71] The Pd@Au-functionalized CFs were dipped in a solution of GO x /LO x [APTMS in PBS (3 μL)] for 60 min and allowed to dry at 4 °C. For the APTMS/CF/AOCE-6 electrode, APTMS/ CFs were treated with methanolic solution of AOCE -6 (5 μL, 0.1 M) for 30 min and allowed to dry in an oven.…”

Advances in paper-based electrochemical immunosensors: review of fabrication strategies and biomedical applications

“…This results in a patterned electrode that corresponds to the stencil used. Ongoing recent advancements in screenprinted electrodes are expanding the range of available inks, leading to novel applications [107][108][109].…”

Electrochemical detection of cholesterol in human biofluid using microneedle sensor

“…[4][5][6][7] For instance, a low cholesterol level is associated with malnutrition, sepsis, low lipoprotein levels, cerebral hemorrhage, anemia, and cancer; a high cholesterol level is associated with coronary heart disease, cerebral thrombosis, hypertension, myocardial infarction, stroke, and atherosclerosis. 5,[8][9][10][11][12][13][14] The development of a sensitive, straightforward-to-use, accurate, and selective sensing platform for the continuous monitoring of cholesterol levels can facilitate the early diagnosis of the abovementioned cardiovascular and neurological conditions.…”