Enhanced immobilization of Prussian blue through hydrogel formation by polymerization of acrylic acid for radioactive cesium adsorption

Abstract

In this study, a hydrogel impregnated with powder activated carbon (PAC), MAA-PAC, was synthesized through the polymerization of acrylic acid (AA) and PB was immobilized using the carboxyl group of AA. In this process, an adsorbent with an enhancement of PB content and stability of immobilization was developed through the additional supply of Fe3+ ions by the layer by layer (LBL) assembly. XRD, FT-IR, SEM (EDS), TEM (EDS, mapping), and TG analyzes of the LBL and non-LBL groups were performed to confirm the change of PB content in the adsorbent as the LBL assembly was applied. The stability of PB immobilization was confirmed during the washing process after the synthesis of the adsorbent. When the LBL assembly process was applied as a PB immobilization strategy, the PB content in the adsorbent was improved and PB leakage was not observed during the washing process. The maximum adsorption (qm) for cesium in the MAA-PAC-PB LBL group that showed high PB content was 40.03 mg/g, and the adsorption isotherm was more suitable for the Langmuir model than the Freundlich model. The LBL group showed a high removal efficiency of 99.81% and a high DF value (525.88) for radioactive cesium (120 Bq/g). These results demonstrate the potential efficiency of the MAA-PAC-PB LBL group for the decontamination of radioactive cesium-contaminated water systems. Furthermore, it was verified that the LBL group of MAA-PAC-PB could be used as an adsorbent without an additional design of the existing water treatment facility. This can an economical decontamination method for removing radioactive cesium.

Acid-Assisted Ball Mill Synthesis of Carboxyl-Functional-Group-Modified Prussian Blue as Sodium-Ion Battery Cathode

“…The larger increase in nitrogen adsorption seen in Sample-A compared to the other two samples may have been due to acetic acid etching [19]. Figure S6d presents the TGA curves for all of the samples, and the results indicate that the samples that underwent carboxyl functional group modification displayed lower water contents [30,31]. This result further proves the conclusion of the XPS results and reveals that the carboxyl functional group can lead to lower interstitial water content in Prussian blue, resulting in a better electrochemical cycle performance.…”

A membrane‐protected micro‐solid‐phase extraction method based on molecular imprinting and its application to the determination of local anesthetics in cosmetics

“…The FT‐IR spectra of the BV MIPs with the template, MIPs, and NIPs are shown in Figures 2A–C, respectively. The spectral bands at 3440 and 1728 cm −1 are assigned to the O─H and C═O bonds in the carboxyl group [34]. The peak at 1631 cm −1 is ascribed to C═C vibration of the functional monomer (MAA) [35].…”

Progress in the preparation of Prussian blue-based nanomaterials for biomedical applications

“…Using the similar growth pattern of PB, Hwang et al designed a hydrogel MAA-PAC impregnated with powdered activated carbon (PAC) through the polymerization of acrylic acid (AA) to develop an adsorbent with enhanced PB content and immobilization stability. 169 The addition of powdered activated carbon (PAC) enhanced the mechanical strength of the gel. Fe( iii ) was first adsorbed by MAA-PAC, and the supply of Fe 3+ ions was provided by layer by layer (LBL) assembly, followed by the addition of potassium ferrocyanide solution (Fig.…”