Characterization of resorcinol–formaldehyde hydrogel as adsorbent for cesium ion

We evaluated the performance of a resorcinol–formaldehyde (RF) hydrogel as an adsorbent for removing aqueous cesium ions (Cs + ), by synthesizing cylindrical pellets of RF gels under different molar ratios (R/C) between resorcinol (R) and sodium carbonate (C) as the catalyst for the sol–gel polycond...

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Bibliographic Details
Published in:Adsorption : journal of the International Adsorption Society 2021-01, Vol.27 (1), p.81-90
Main Authors: Taguchi, Shogo, Nakatani, Tomoki, Saeki, Haruna, Tayakout‑Fayolle, Mélaz, Itoh, Kazuhiro, Yamamoto, Takuji
Format: Article
Language:English
Subjects:
Adsorbents
Cesium ions
Chemical synthesis
Chemistry
Chemistry and Materials Science
Diffusion coefficient
Engineering Thermodynamics
Formaldehyde
Heat and Mass Transfer
Hydrogels
Industrial Chemistry/Chemical Engineering
Particle diffusion
Sodium carbonate
Sol-gel processes
Surfaces and Interfaces
Thin Films
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Summary:We evaluated the performance of a resorcinol–formaldehyde (RF) hydrogel as an adsorbent for removing aqueous cesium ions (Cs + ), by synthesizing cylindrical pellets of RF gels under different molar ratios (R/C) between resorcinol (R) and sodium carbonate (C) as the catalyst for the sol–gel polycondensation in the range from 2.5 to 400. The RF gel prepared at R/C = 2.5, containing the greatest amount of sodium ion (Na + ), had the greatest Cs + adsorption amount (0.660 mmol g −1 ), because Cs + could be adsorbed on the network structure in the gel through exchange with Na + at an equal molar ratio, but with the smallest effective diffusion coefficient of Cs + (1.45 × 10 –12 m 2  s −1 ). Kinetic analyses based on the Dryden–Kay and intra-particle diffusion models revealed that the diffusivity of Cs + in the RF gel depended strongly on the density of the network structure, which can be controlled by varying the R/C ratio. Graphic abstract
ISSN:0929-5607
1572-8757
DOI:10.1007/s10450-020-00271-y