EXPERIMENTAL AND MODELING STUDIES OF SR2+ AND CS+ SORPTION ON CRYOGELS AND COMPARISON TO COMMERCIAL ADSORBENTS
Loading...
Date
2022
Authors
Baimenov, Alzhan
Montagnaro, Fabio
Inglezakis, Vassilis J.
Balsamo, Marco
Journal Title
Journal ISSN
Volume Title
Publisher
Industrial & Engineering Chemistry Research
Abstract
In this work, two cryogels with the key monomers
methacrylic acid and 2-acrylamido-2-methyl-1-propansulfonic acid
(named AAC and SAC, respectively) with various functional
groups were used as adsorbents for the removal of cesium and
strontium ions from aqueous solutions. Kinetics, equilibrium, and
column studies were carried out including experiments in different
water matrices (ultrapure, tap, and river water) and comparison to
commercial adsorbents. AAC reached sorption capacity of 362 mg
g−1 for Cs+ and 209 mg g−1 for Sr2+, whereas SAC polymer showed
maximum removal capacities of 259 and 211 mg g−1 for Cs+ and
Sr2+, respectively. The five cycles of adsorption/desorption
experiments showed a maximum of 8% loss of effectiveness for
both cryogels. Batch kinetics adsorption data were modeled by using a rigorous diffusional model coupled to a novel fractal-like
expression for variable surface diffusivity. The model revealed that the surface diffusivity dependence on time is nonmonotonic, with
the occurrence of a maximum. Also, both fluid film and intraparticle transport resistances were shown to be important, with the
internal one being more influential. The cryogels and two commercial materials (ion-exchange resin and zeolite) were tested for the
removal of Cs+ and Sr2+ in ultrapure, tap, and river water; the results showed that the cryogels exhibit competitive effectiveness.
Description
Keywords
Type of access: Open Access, Adsorption, Diffusion, Equilibrium, Ions, Transport properties
Citation
Baimenov, A., Montagnaro, F., Inglezakis, V. J., & Balsamo, M. (2022c). Experimental and Modeling Studies of Sr2+ and Cs+ Sorption on Cryogels and Comparison to Commercial Adsorbents. Industrial & Engineering Chemistry Research, 61(23), 8204–8219. https://doi.org/10.1021/acs.iecr.2c00531